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# code for cores isolation was inspired by Tuna implementation
# perf code was borrowed from kernel/tools/perf/python/twatch.py
# thanks to Arnaldo Carvalho de Melo <acme@redhat.com>
from . import base
from .decorators import *
import tuned.logs
import re
from subprocess import *
import threading
import perf
import select
import tuned.consts as consts
import procfs
from tuned.utils.commands import commands
import errno
import os
import collections
import math
# Check existence of scheduler API in os module
try:
os.SCHED_FIFO
except AttributeError:
import schedutils
log = tuned.logs.get()
class SchedulerParams(object):
def __init__(self, cmd, cmdline = None, scheduler = None,
priority = None, affinity = None, cgroup = None):
self._cmd = cmd
self.cmdline = cmdline
self.scheduler = scheduler
self.priority = priority
self.affinity = affinity
self.cgroup = cgroup
@property
def affinity(self):
if self._affinity is None:
return None
else:
return self._cmd.bitmask2cpulist(self._affinity)
@affinity.setter
def affinity(self, value):
if value is None:
self._affinity = None
else:
self._affinity = self._cmd.cpulist2bitmask(value)
class IRQAffinities(object):
def __init__(self):
self.irqs = {}
self.default = None
# IRQs that don't support changing CPU affinity:
self.unchangeable = []
class SchedulerUtils(object):
"""
Class encapsulating scheduler implementation in os module
"""
_dict_schedcfg2schedconst = {
"f": "SCHED_FIFO",
"b": "SCHED_BATCH",
"r": "SCHED_RR",
"o": "SCHED_OTHER",
"i": "SCHED_IDLE",
}
def __init__(self):
# {"f": os.SCHED_FIFO...}
self._dict_schedcfg2num = dict((k, getattr(os, name)) for k, name in self._dict_schedcfg2schedconst.items())
# { os.SCHED_FIFO: "SCHED_FIFO"... }
self._dict_num2schedconst = dict((getattr(os, name), name) for name in self._dict_schedcfg2schedconst.values())
def sched_cfg_to_num(self, str_scheduler):
return self._dict_schedcfg2num.get(str_scheduler)
# Reimplementation of schedstr from schedutils for logging purposes
def sched_num_to_const(self, scheduler):
return self._dict_num2schedconst.get(scheduler)
def get_scheduler(self, pid):
return os.sched_getscheduler(pid)
def set_scheduler(self, pid, sched, prio):
os.sched_setscheduler(pid, sched, os.sched_param(prio))
def get_affinity(self, pid):
return os.sched_getaffinity(pid)
def set_affinity(self, pid, affinity):
os.sched_setaffinity(pid, affinity)
def get_priority(self, pid):
return os.sched_getparam(pid).sched_priority
def get_priority_min(self, sched):
return os.sched_get_priority_min(sched)
def get_priority_max(self, sched):
return os.sched_get_priority_max(sched)
class SchedulerUtilsSchedutils(SchedulerUtils):
"""
Class encapsulating scheduler implementation in schedutils module
"""
def __init__(self):
# { "f": schedutils.SCHED_FIFO... }
self._dict_schedcfg2num = dict((k, getattr(schedutils, name)) for k, name in self._dict_schedcfg2schedconst.items())
# { schedutils.SCHED_FIFO: "SCHED_FIFO"... }
self._dict_num2schedconst = dict((getattr(schedutils, name), name) for name in self._dict_schedcfg2schedconst.values())
def get_scheduler(self, pid):
return schedutils.get_scheduler(pid)
def set_scheduler(self, pid, sched, prio):
schedutils.set_scheduler(pid, sched, prio)
def get_affinity(self, pid):
return schedutils.get_affinity(pid)
def set_affinity(self, pid, affinity):
schedutils.set_affinity(pid, affinity)
def get_priority(self, pid):
return schedutils.get_priority(pid)
def get_priority_min(self, sched):
return schedutils.get_priority_min(sched)
def get_priority_max(self, sched):
return schedutils.get_priority_max(sched)
class SchedulerPlugin(base.Plugin):
r"""
`scheduler`::
Allows tuning of scheduling priorities, process/thread/IRQ
affinities, and CPU isolation.
+
To prevent processes/threads/IRQs from using certain CPUs, use
the [option]`isolated_cores` option. It changes process/thread
affinities, IRQs affinities and it sets `default_smp_affinity`
for IRQs. The CPU affinity mask is adjusted for all processes and
threads matching [option]`ps_whitelist` option subject to success
of the `sched_setaffinity()` system call. The default setting of
the [option]`ps_whitelist` regular expression is `.*` to match all
processes and thread names. To exclude certain processes and threads
use [option]`ps_blacklist` option. The value of this option is also
interpreted as a regular expression and process/thread names (`ps -eo
cmd`) are matched against that expression. Profile rollback allows
all matching processes and threads to run on all CPUs and restores
the IRQ settings prior to the profile application.
+
Multiple regular expressions for [option]`ps_whitelist`
and [option]`ps_blacklist` options are allowed and separated by
`;`. Quoted semicolon `\;` is taken literally.
+
.Isolate CPUs 2-4
====
----
[scheduler]
isolated_cores=2-4
ps_blacklist=.*pmd.*;.*PMD.*;^DPDK;.*qemu-kvm.*
----
Isolate CPUs 2-4 while ignoring processes and threads matching
`ps_blacklist` regular expressions.
====
The [option]`irq_process` option controls whether the scheduler plugin
applies the `isolated_cores` parameter to IRQ affinities. The default
value is `true`, which means that the scheduler plugin will move all
possible IRQs away from the isolated cores. When `irq_process` is set
to `false`, the plugin will not change any IRQ affinities.
====
The [option]`default_irq_smp_affinity` option controls the values
*TuneD* writes to `/proc/irq/default_smp_affinity`. The file specifies
default affinity mask that applies to all non-active IRQs. Once an
IRQ is allocated/activated its affinity bitmask will be set to the
default mask.
+
The following values are supported:
+
--
`calc`::
Content of `/proc/irq/default_smp_affinity` will be calculated
from the `isolated_cores` parameter. Non-isolated cores
are calculated as an inversion of the `isolated_cores`. Then
the intersection of the non-isolated cores and the previous
content of `/proc/irq/default_smp_affinity` is written to
`/proc/irq/default_smp_affinity`. If the intersection is
an empty set, then just the non-isolated cores are written to
`/proc/irq/default_smp_affinity`. This behavior is the default if
the parameter `default_irq_smp_affinity` is omitted.
`ignore`::
*TuneD* will not touch `/proc/irq/default_smp_affinity`.
explicit cpulist::
The cpulist (such as 1,3-4) is unpacked and written directly to
`/proc/irq/default_smp_affinity`.
--
+
.An explicit CPU list to set the default IRQ smp affinity to CPUs 0 and 2
====
----
[scheduler]
isolated_cores=1,3
default_irq_smp_affinity=0,2
----
====
To adjust scheduling policy, priority and affinity for a group of
processes/threads, use the following syntax.
+
[subs="+quotes,+macros"]
----
group.__groupname__=__rule_prio__:__sched__:__prio__:__affinity__:__regex__
----
+
where `__rule_prio__` defines internal *TuneD* priority of the
rule. Rules are sorted based on priority. This is needed for
inheritence to be able to reorder previously defined rules. Equal
`__rule_prio__` rules should be processed in the order they were
defined. However, this is Python interpreter dependant. To disable
an inherited rule for `__groupname__` use:
+
[subs="+quotes,+macros"]
----
group.__groupname__=
----
+
`__sched__` must be one of:
*`f`* for FIFO,
*`b`* for batch,
*`r`* for round robin,
*`o`* for other,
*`*`* do not change.
+
`__affinity__` is CPU affinity in hexadecimal. Use `*` for no change.
+
`__prio__` scheduling priority (see `chrt -m`).
+
`__regex__` is Python regular expression. It is matched against the output of
+
[subs="+quotes,+macros"]
----
ps -eo cmd
----
+
Any given process name may match more than one group. In such a case,
the priority and scheduling policy are taken from the last matching
`__regex__`.
+
.Setting scheduling policy and priorities to kernel threads and watchdog
====
----
[scheduler]
group.kthreads=0:*:1:*:\[.*\]$
group.watchdog=0:f:99:*:\[watchdog.*\]
----
====
+
The scheduler plug-in uses perf event loop to catch newly created
processes. By default it listens to `perf.RECORD_COMM` and
`perf.RECORD_EXIT` events. By setting [option]`perf_process_fork`
option to `true`, `perf.RECORD_FORK` events will be also listened
to. In other words, child processes created by the `fork()` system
call will be processed. Since child processes inherit CPU affinity
from their parents, the scheduler plug-in usually does not need to
explicitly process these events. As processing perf events can
pose a significant CPU overhead, the [option]`perf_process_fork`
option parameter is set to `false` by default. Due to this, child
processes are not processed by the scheduler plug-in.
+
The CPU overhead of the scheduler plugin can be mitigated by using
the scheduler [option]`runtime` option and setting it to `0`. This
will completely disable the dynamic scheduler functionality and the
perf events will not be monitored and acted upon. The disadvantage
ot this approach is the procees/thread tuning will be done only at
profile application.
+
.Disabling the scheduler dynamic functionality
====
----
[scheduler]
runtime=0
isolated_cores=1,3
----
====
+
NOTE: For perf events, memory mapped buffer is used. Under heavy load
the buffer may overflow. In such cases the `scheduler` plug-in
may start missing events and failing to process some newly created
processes. Increasing the buffer size may help. The buffer size can
be set with the [option]`perf_mmap_pages` option. The value of this
parameter has to expressed in powers of 2. If it is not the power
of 2, the nearest higher power of 2 value is calculated from it
and this calculated value used. If the [option]`perf_mmap_pages`
option is omitted, the default kernel value is used.
+
The scheduler plug-in supports process/thread confinement using
cgroups v1.
+
[option]`cgroup_mount_point` option specifies the path to mount the
cgroup filesystem or where *TuneD* expects it to be mounted. If unset,
`/sys/fs/cgroup/cpuset` is expected.
+
If [option]`cgroup_groups_init` option is set to `1` *TuneD*
will create (and remove) all cgroups defined with the `cgroup*`
options. This is the default behavior. If it is set to `0` the
cgroups need to be preset by other means.
+
If [option]`cgroup_mount_point_init` option is set to `1`,
*TuneD* will create (and remove) the cgroup mountpoint. It implies
`cgroup_groups_init = 1`. If set to `0` the cgroups mount point
needs to be preset by other means. This is the default behavior.
+
The [option]`cgroup_for_isolated_cores` option is the cgroup
name used for the [option]`isolated_cores` option functionality. For
example, if a system has 4 CPUs, `isolated_cores=1` means that all
processes/threads will be moved to CPUs 0,2-3.
The scheduler plug-in will isolate the specified core by writing
the calculated CPU affinity to the `cpuset.cpus` control file of
the specified cgroup and move all the matching processes/threads to
this group. If this option is unset, classic cpuset affinity using
`sched_setaffinity()` will be used.
+
[option]`cgroup.__cgroup_name__` option defines affinities for
arbitrary cgroups. Even hierarchic cgroups can be used, but the
hieararchy needs to be specified in the correct order. Also *TuneD*
does not do any sanity checks here, with the exception that it forces
the cgroup to be under [option]`cgroup_mount_point`.
+
The syntax of the scheduler option starting with `group.` has been
augmented to use `cgroup.__cgroup_name__` instead of the hexadecimal
`__affinity__`. The matching processes will be moved to the cgroup
`__cgroup_name__`. It is also possible to use cgroups which have
not been defined by the [option]`cgroup.` option as described above,
i.e. cgroups not managed by *TuneD*.
+
All cgroup names are sanitized by replacing all all dots (`.`) with
slashes (`/`). This is to prevent the plug-in from writing outside
[option]`cgroup_mount_point`.
+
.Using cgroups v1 with the scheduler plug-in
====
----
[scheduler]
cgroup_mount_point=/sys/fs/cgroup/cpuset
cgroup_mount_point_init=1
cgroup_groups_init=1
cgroup_for_isolated_cores=group
cgroup.group1=2
cgroup.group2=0,2
group.ksoftirqd=0:f:2:cgroup.group1:ksoftirqd.*
ps_blacklist=ksoftirqd.*;rcuc.*;rcub.*;ktimersoftd.*
isolated_cores=1
----
Cgroup `group1` has the affinity set to CPU 2 and the cgroup `group2`
to CPUs 0,2. Given a 4 CPU setup, the [option]`isolated_cores=1`
option causes all processes/threads to be moved to CPU
cores 0,2-3. Processes/threads that are blacklisted by the
[option]`ps_blacklist` regular expression will not be moved.
The scheduler plug-in will isolate the specified core by writing the
CPU affinity 0,2-3 to the `cpuset.cpus` control file of the `group`
and move all the matching processes/threads to this cgroup.
====
Option [option]`cgroup_ps_blacklist` allows excluding processes
which belong to the blacklisted cgroups. The regular expression specified
by this option is matched against cgroup hierarchies from
`/proc/PID/cgroups`. Cgroups v1 hierarchies from `/proc/PID/cgroups`
are separated by commas ',' prior to regular expression matching. The
following is an example of content against which the regular expression
is matched against: `10:hugetlb:/,9:perf_event:/,8:blkio:/`
+
Multiple regular expressions can be separated by semicolon ';'. The
semicolon represents a logical 'or' operator.
+
.Cgroup-based exclusion of processes from the scheduler
====
----
[scheduler]
isolated_cores=1
cgroup_ps_blacklist=:/daemons\b
----
The scheduler plug-in will move all processes away from core 1 except processes which
belong to cgroup '/daemons'. The '\b' is a regular expression
metacharacter that matches a word boundary.
----
[scheduler]
isolated_cores=1
cgroup_ps_blacklist=\b8:blkio:
----
The scheduler plug-in will exclude all processes which belong to a cgroup
with hierarchy-ID 8 and controller-list blkio.
====
Recent kernels moved some `sched_` and `numa_balancing_` kernel run-time
parameters from `/proc/sys/kernel`, managed by the `sysctl` utility, to
`debugfs`, typically mounted under `/sys/kernel/debug`. TuneD provides an
abstraction mechanism for the following parameters via the scheduler plug-in:
[option]`sched_min_granularity_ns`, [option]`sched_latency_ns`,
[option]`sched_wakeup_granularity_ns`, [option]`sched_tunable_scaling`,
[option]`sched_migration_cost_ns`, [option]`sched_nr_migrate`,
[option]`numa_balancing_scan_delay_ms`,
[option]`numa_balancing_scan_period_min_ms`,
[option]`numa_balancing_scan_period_max_ms` and
[option]`numa_balancing_scan_size_mb`.
Based on the kernel used, TuneD will write the specified value to the correct
location.
+
.Set tasks' "cache hot" value for migration decisions.
====
----
[scheduler]
sched_migration_cost_ns=500000
----
On the old kernels, this is equivalent to:
----
[sysctl]
kernel.sched_migration_cost_ns=500000
----
that is, value `500000` will be written to `/proc/sys/kernel/sched_migration_cost_ns`.
However, on more recent kernels, the value `500000` will be written to
`/sys/kernel/debug/sched/migration_cost_ns`.
====
"""
def __init__(self, monitor_repository, storage_factory, hardware_inventory, device_matcher, device_matcher_udev, plugin_instance_factory, global_cfg, variables):
super(SchedulerPlugin, self).__init__(monitor_repository, storage_factory, hardware_inventory, device_matcher, device_matcher_udev, plugin_instance_factory, global_cfg, variables)
self._has_dynamic_options = True
self._daemon = consts.CFG_DEF_DAEMON
self._sleep_interval = int(consts.CFG_DEF_SLEEP_INTERVAL)
if global_cfg is not None:
self._daemon = global_cfg.get_bool(consts.CFG_DAEMON, consts.CFG_DEF_DAEMON)
self._sleep_interval = int(global_cfg.get(consts.CFG_SLEEP_INTERVAL, consts.CFG_DEF_SLEEP_INTERVAL))
self._cmd = commands()
# helper variable utilized for showing hint only once that the error may be caused by Secure Boot
self._secure_boot_hint = None
# paths cache for sched_ and numa_ tunings
self._sched_knob_paths_cache = {}
# default is to whitelist all and blacklist none
self._ps_whitelist = ".*"
self._ps_blacklist = ""
self._cgroup_ps_blacklist_re = ""
self._cpus = perf.cpu_map()
self._scheduler_storage_key = self._storage_key(
command_name = "scheduler")
self._irq_process = True
self._irq_storage_key = self._storage_key(
command_name = "irq")
self._evlist = None
try:
self._scheduler_utils = SchedulerUtils()
except AttributeError:
self._scheduler_utils = SchedulerUtilsSchedutils()
def _calc_mmap_pages(self, mmap_pages):
if mmap_pages is None:
return None
try:
mp = int(mmap_pages)
except ValueError:
return 0
if mp <= 0:
return 0
# round up to the nearest power of two value
return int(2 ** math.ceil(math.log(mp, 2)))
def _instance_init(self, instance):
instance._evlist = None
instance._has_dynamic_tuning = False
instance._has_static_tuning = True
# this is hack, runtime_tuning should be covered by dynamic_tuning configuration
# TODO: add per plugin dynamic tuning configuration and use dynamic_tuning configuration
# instead of runtime_tuning
instance._runtime_tuning = True
# FIXME: do we want to do this here?
# recover original values in case of crash
self._scheduler_original = self._storage.get(
self._scheduler_storage_key, {})
if len(self._scheduler_original) > 0:
log.info("recovering scheduling settings from previous run")
self._restore_ps_affinity()
self._scheduler_original = {}
self._storage.unset(self._scheduler_storage_key)
self._cgroups_original_affinity = dict()
# calculated by isolated_cores setter
self._affinity = None
self._cgroup_affinity_initialized = False
self._cgroup = None
self._cgroups = collections.OrderedDict([(self._sanitize_cgroup_path(option[7:]), self._variables.expand(affinity))
for option, affinity in instance.options.items() if option[:7] == "cgroup." and len(option) > 7])
instance._scheduler = instance.options
perf_mmap_pages_raw = self._variables.expand(instance.options["perf_mmap_pages"])
perf_mmap_pages = self._calc_mmap_pages(perf_mmap_pages_raw)
if perf_mmap_pages == 0:
log.error("Invalid 'perf_mmap_pages' value specified: '%s', using default kernel value" % perf_mmap_pages_raw)
perf_mmap_pages = None
if perf_mmap_pages is not None and str(perf_mmap_pages) != perf_mmap_pages_raw:
log.info("'perf_mmap_pages' value has to be power of two, specified: '%s', using: '%d'" %
(perf_mmap_pages_raw, perf_mmap_pages))
for k in instance._scheduler:
instance._scheduler[k] = self._variables.expand(instance._scheduler[k])
if self._cmd.get_bool(instance._scheduler.get("runtime", 1)) == "0":
instance._runtime_tuning = False
instance._terminate = threading.Event()
if self._daemon and instance._runtime_tuning:
try:
instance._threads = perf.thread_map()
evsel = perf.evsel(type = perf.TYPE_SOFTWARE,
config = perf.COUNT_SW_DUMMY,
task = 1, comm = 1, mmap = 0, freq = 0,
wakeup_events = 1, watermark = 1,
sample_type = perf.SAMPLE_TID | perf.SAMPLE_CPU)
evsel.open(cpus = self._cpus, threads = instance._threads)
instance._evlist = perf.evlist(self._cpus, instance._threads)
instance._evlist.add(evsel)
if perf_mmap_pages is None:
instance._evlist.mmap()
else:
instance._evlist.mmap(pages = perf_mmap_pages)
# no perf
except:
instance._runtime_tuning = False
def _instance_cleanup(self, instance):
if instance._evlist:
for fd in instance._evlist.get_pollfd():
os.close(fd.name)
@classmethod
def _get_config_options(cls):
return {
"isolated_cores": None,
"cgroup_mount_point": consts.DEF_CGROUP_MOUNT_POINT,
"cgroup_mount_point_init": False,
"cgroup_groups_init": True,
"cgroup_for_isolated_cores": None,
"cgroup_ps_blacklist": None,
"ps_whitelist": None,
"ps_blacklist": None,
"irq_process": True,
"default_irq_smp_affinity": "calc",
"perf_mmap_pages": None,
"perf_process_fork": "false",
"sched_min_granularity_ns": None,
"sched_latency_ns": None,
"sched_wakeup_granularity_ns": None,
"sched_tunable_scaling": None,
"sched_migration_cost_ns": None,
"sched_nr_migrate": None,
"numa_balancing_scan_delay_ms": None,
"numa_balancing_scan_period_min_ms": None,
"numa_balancing_scan_period_max_ms": None,
"numa_balancing_scan_size_mb": None
}
def _sanitize_cgroup_path(self, value):
return str(value).replace(".", "/") if value is not None else None
# Raises OSError, IOError
def _get_cmdline(self, process):
if not isinstance(process, procfs.process):
pid = process
process = procfs.process(pid)
cmdline = procfs.process_cmdline(process)
if self._is_kthread(process):
cmdline = "[" + cmdline + "]"
return cmdline
# Raises OSError, IOError
def get_processes(self):
ps = procfs.pidstats()
ps.reload_threads()
processes = {}
for proc in ps.values():
try:
cmd = self._get_cmdline(proc)
pid = proc["pid"]
processes[pid] = cmd
if "threads" in proc:
for pid in proc["threads"].keys():
cmd = self._get_cmdline(proc)
processes[pid] = cmd
except (OSError, IOError) as e:
if e.errno == errno.ENOENT \
or e.errno == errno.ESRCH:
continue
else:
raise
return processes
# Raises OSError
# Raises SystemError with old (pre-0.4) python-schedutils
# instead of OSError
# If PID doesn't exist, errno == ESRCH
def _get_rt(self, pid):
scheduler = self._scheduler_utils.get_scheduler(pid)
sched_str = self._scheduler_utils.sched_num_to_const(scheduler)
priority = self._scheduler_utils.get_priority(pid)
log.debug("Read scheduler policy '%s' and priority '%d' of PID '%d'"
% (sched_str, priority, pid))
return (scheduler, priority)
def _set_rt(self, pid, sched, prio):
sched_str = self._scheduler_utils.sched_num_to_const(sched)
log.debug("Setting scheduler policy to '%s' and priority to '%d' of PID '%d'."
% (sched_str, prio, pid))
try:
prio_min = self._scheduler_utils.get_priority_min(sched)
prio_max = self._scheduler_utils.get_priority_max(sched)
if prio < prio_min or prio > prio_max:
log.error("Priority for %s must be in range %d - %d. '%d' was given."
% (sched_str, prio_min,
prio_max, prio))
# Workaround for old (pre-0.4) python-schedutils which raised
# SystemError instead of OSError
except (SystemError, OSError) as e:
log.error("Failed to get allowed priority range: %s"
% e)
try:
self._scheduler_utils.set_scheduler(pid, sched, prio)
except (SystemError, OSError) as e:
if hasattr(e, "errno") and e.errno == errno.ESRCH:
log.debug("Failed to set scheduling parameters of PID %d, the task vanished."
% pid)
else:
log.error("Failed to set scheduling parameters of PID %d: %s"
% (pid, e))
# process is a procfs.process object
# Raises OSError, IOError
def _is_kthread(self, process):
return process["stat"]["flags"] & procfs.pidstat.PF_KTHREAD != 0
# Return codes:
# 0 - Affinity is fixed
# 1 - Affinity is changeable
# -1 - Task vanished
# -2 - Error
def _affinity_changeable(self, pid):
try:
process = procfs.process(pid)
if process["stat"].is_bound_to_cpu():
if process["stat"]["state"] == "Z":
log.debug("Affinity of zombie task with PID %d cannot be changed, the task's affinity mask is fixed."
% pid)
elif self._is_kthread(process):
log.debug("Affinity of kernel thread with PID %d cannot be changed, the task's affinity mask is fixed."
% pid)
else:
log.warn("Affinity of task with PID %d cannot be changed, the task's affinity mask is fixed."
% pid)
return 0
else:
return 1
except (OSError, IOError) as e:
if e.errno == errno.ENOENT or e.errno == errno.ESRCH:
log.debug("Failed to get task info for PID %d, the task vanished."
% pid)
return -1
else:
log.error("Failed to get task info for PID %d: %s"
% (pid, e))
return -2
except (AttributeError, KeyError) as e:
log.error("Failed to get task info for PID %d: %s"
% (pid, e))
return -2
def _store_orig_process_rt(self, pid, scheduler, priority):
try:
params = self._scheduler_original[pid]
except KeyError:
params = SchedulerParams(self._cmd)
self._scheduler_original[pid] = params
if params.scheduler is None and params.priority is None:
params.scheduler = scheduler
params.priority = priority
def _tune_process_rt(self, pid, sched, prio):
cont = True
if sched is None and prio is None:
return cont
try:
(prev_sched, prev_prio) = self._get_rt(pid)
if sched is None:
sched = prev_sched
self._set_rt(pid, sched, prio)
self._store_orig_process_rt(pid, prev_sched, prev_prio)
except (SystemError, OSError) as e:
if hasattr(e, "errno") and e.errno == errno.ESRCH:
log.debug("Failed to read scheduler policy of PID %d, the task vanished."
% pid)
if pid in self._scheduler_original:
del self._scheduler_original[pid]
cont = False
else:
log.error("Refusing to set scheduler and priority of PID %d, reading original scheduling parameters failed: %s"
% (pid, e))
return cont
def _is_cgroup_affinity(self, affinity):
return str(affinity)[:7] == "cgroup."
def _store_orig_process_affinity(self, pid, affinity, is_cgroup = False):
try:
params = self._scheduler_original[pid]
except KeyError:
params = SchedulerParams(self._cmd)
self._scheduler_original[pid] = params
if params.affinity is None and params.cgroup is None:
if is_cgroup:
params.cgroup = affinity
else:
params.affinity = affinity
def _get_cgroup_affinity(self, pid):
# we cannot use procfs, because it uses comma ',' delimiter which
# can be ambiguous
for l in self._cmd.read_file("%s/%s/%s" % (consts.PROCFS_MOUNT_POINT, str(pid), "cgroup"), no_error = True).split("\n"):
try:
cgroup = l.split(":cpuset:")[1][1:]
return cgroup if cgroup != "" else "/"
except IndexError:
pass
return "/"
# it can be arbitrary cgroup even cgroup we didn't set, but it needs to be
# under "cgroup_mount_point"
def _set_cgroup(self, pid, cgroup):
cgroup = self._sanitize_cgroup_path(cgroup)
path = self._cgroup_mount_point
if cgroup != "/":
path = "%s/%s" % (path, cgroup)
self._cmd.write_to_file("%s/tasks" % path, str(pid), no_error = True)
def _parse_cgroup_affinity(self, cgroup):
# "cgroup.CGROUP"
cgroup = cgroup[7:]
# this should be faster than string comparison
is_cgroup = not isinstance(cgroup, list) and len(cgroup) > 0
return is_cgroup, cgroup
def _tune_process_affinity(self, pid, affinity, intersect = False):
cont = True
if affinity is None:
return cont
try:
(is_cgroup, cgroup) = self._parse_cgroup_affinity(affinity)
if is_cgroup:
prev_affinity = self._get_cgroup_affinity(pid)
self._set_cgroup(pid, cgroup)
else:
prev_affinity = self._get_affinity(pid)
if intersect:
affinity = self._get_intersect_affinity(
prev_affinity, affinity,
affinity)
self._set_affinity(pid, affinity)
self._store_orig_process_affinity(pid,
prev_affinity, is_cgroup)
except (SystemError, OSError) as e:
if hasattr(e, "errno") and e.errno == errno.ESRCH:
log.debug("Failed to read affinity of PID %d, the task vanished."
% pid)
if pid in self._scheduler_original:
del self._scheduler_original[pid]
cont = False
else:
log.error("Refusing to set CPU affinity of PID %d, reading original affinity failed: %s"
% (pid, e))
return cont
#tune process and store previous values
def _tune_process(self, pid, cmd, sched, prio, affinity):
cont = self._tune_process_rt(pid, sched, prio)
if not cont:
return
cont = self._tune_process_affinity(pid, affinity)
if not cont or pid not in self._scheduler_original:
return
self._scheduler_original[pid].cmdline = cmd
def _convert_sched_params(self, str_scheduler, str_priority):
scheduler = self._scheduler_utils.sched_cfg_to_num(str_scheduler)
if scheduler is None and str_scheduler != "*":
log.error("Invalid scheduler: %s. Scheduler and priority will be ignored."
% str_scheduler)
return (None, None)
else:
try:
priority = int(str_priority)
except ValueError:
log.error("Invalid priority: %s. Scheduler and priority will be ignored."
% str_priority)
return (None, None)
return (scheduler, priority)
def _convert_affinity(self, str_affinity):
if str_affinity == "*":
affinity = None
elif self._is_cgroup_affinity(str_affinity):
affinity = str_affinity
else:
affinity = self._cmd.hex2cpulist(str_affinity)
if not affinity:
log.error("Invalid affinity: %s. It will be ignored."
% str_affinity)
affinity = None
return affinity
def _convert_sched_cfg(self, vals):
(rule_prio, scheduler, priority, affinity, regex) = vals
(scheduler, priority) = self._convert_sched_params(
scheduler, priority)
affinity = self._convert_affinity(affinity)
return (rule_prio, scheduler, priority, affinity, regex)
def _cgroup_create_group(self, cgroup):
path = "%s/%s" % (self._cgroup_mount_point, cgroup)
try:
os.mkdir(path, consts.DEF_CGROUP_MODE)
except OSError as e:
log.error("Unable to create cgroup '%s': %s" % (path, e))
if (not self._cmd.write_to_file("%s/%s" % (path, "cpuset.mems"),
self._cmd.read_file("%s/%s" % (self._cgroup_mount_point, "cpuset.mems"), no_error = True),
no_error = True)):
log.error("Unable to initialize 'cpuset.mems ' for cgroup '%s'" % path)
def _cgroup_initialize_groups(self):
if self._cgroup is not None and not self._cgroup in self._cgroups:
self._cgroup_create_group(self._cgroup)
for cg in self._cgroups:
self._cgroup_create_group(cg)
def _cgroup_initialize(self):
log.debug("Initializing cgroups settings")
try:
os.makedirs(self._cgroup_mount_point, consts.DEF_CGROUP_MODE)
except OSError as e:
log.error("Unable to create cgroup mount point: %s" % e)
(ret, out) = self._cmd.execute(["mount", "-t", "cgroup", "-o", "cpuset", "cpuset", self._cgroup_mount_point])
if ret != 0:
log.error("Unable to mount '%s'" % self._cgroup_mount_point)
def _remove_dir(self, cgroup):
try:
os.rmdir(cgroup)
except OSError as e:
log.error("Unable to remove directory '%s': %s" % (cgroup, e))
def _cgroup_finalize_groups(self):
for cg in reversed(self._cgroups):
self._remove_dir("%s/%s" % (self._cgroup_mount_point, cg))
if self._cgroup is not None and not self._cgroup in self._cgroups:
self._remove_dir("%s/%s" % (self._cgroup_mount_point, self._cgroup))
def _cgroup_finalize(self):
log.debug("Removing cgroups settings")
(ret, out) = self._cmd.execute(["umount", self._cgroup_mount_point])
if ret != 0:
log.error("Unable to umount '%s'" % self._cgroup_mount_point)
return False
self._remove_dir(self._cgroup_mount_point)
d = os.path.dirname(self._cgroup_mount_point)
if (d != "/"):
self._remove_dir(d)
def _cgroup_set_affinity_one(self, cgroup, affinity, backup = False):
if affinity != "":
log.debug("Setting cgroup '%s' affinity to '%s'" % (cgroup, affinity))
else:
log.debug("Skipping cgroup '%s', empty affinity requested" % cgroup)
return
path = "%s/%s/%s" % (self._cgroup_mount_point, cgroup, "cpuset.cpus")
if backup:
orig_affinity = self._cmd.read_file(path, err_ret = "ERR", no_error = True).strip()
if orig_affinity != "ERR":
self._cgroups_original_affinity[cgroup] = orig_affinity
else:
log.error("Refusing to set affinity of cgroup '%s', reading original affinity failed" % cgroup)
return
if not self._cmd.write_to_file(path, affinity, no_error = True):
log.error("Unable to set affinity '%s' for cgroup '%s'" % (affinity, cgroup))
def _cgroup_set_affinity(self):
if self._cgroup_affinity_initialized:
return
log.debug("Setting cgroups affinities")
if self._affinity is not None and self._cgroup is not None and not self._cgroup in self._cgroups:
self._cgroup_set_affinity_one(self._cgroup, self._affinity, backup = True)
for cg in self._cgroups.items():
self._cgroup_set_affinity_one(cg[0], cg[1], backup = True)
self._cgroup_affinity_initialized = True
def _cgroup_restore_affinity(self):
log.debug("Restoring cgroups affinities")
for cg in self._cgroups_original_affinity.items():
self._cgroup_set_affinity_one(cg[0], cg[1])
def _instance_apply_static(self, instance):
# need to get "cgroup_mount_point_init", "cgroup_mount_point", "cgroup_groups_init",
# "cgroup", and initialize mount point and cgroups before super class implementation call
self._cgroup_mount_point = self._variables.expand(instance.options["cgroup_mount_point"])
self._cgroup_mount_point_init = self._cmd.get_bool(self._variables.expand(
instance.options["cgroup_mount_point_init"])) == "1"
self._cgroup_groups_init = self._cmd.get_bool(self._variables.expand(
instance.options["cgroup_groups_init"])) == "1"
self._cgroup = self._sanitize_cgroup_path(self._variables.expand(
instance.options["cgroup_for_isolated_cores"]))
if self._cgroup_mount_point_init:
self._cgroup_initialize()
if self._cgroup_groups_init or self._cgroup_mount_point_init:
self._cgroup_initialize_groups()
super(SchedulerPlugin, self)._instance_apply_static(instance)
self._cgroup_set_affinity()
try:
ps = self.get_processes()
except (OSError, IOError) as e:
log.error("error applying tuning, cannot get information about running processes: %s"
% e)
return
sched_cfg = [(option, str(value).split(":", 4)) for option, value in instance._scheduler.items()]
buf = [(option, self._convert_sched_cfg(vals))
for option, vals in sched_cfg
if re.match(r"group\.", option)
and len(vals) == 5]
sched_cfg = sorted(buf, key=lambda option_vals: option_vals[1][0])
sched_all = dict()
# for runtime tuning
instance._sched_lookup = {}
for option, (rule_prio, scheduler, priority, affinity, regex) \
in sched_cfg:
try:
r = re.compile(regex)
except re.error as e:
log.error("error compiling regular expression: '%s'" % str(regex))
continue
processes = [(pid, cmd) for pid, cmd in ps.items() if re.search(r, cmd) is not None]
#cmd - process name, option - group name
sched = dict([(pid, (cmd, option, scheduler, priority, affinity, regex))
for pid, cmd in processes])
sched_all.update(sched)
# make any contained regexes non-capturing: replace "(" with "(?:",
# unless the "(" is preceded by "\" or followed by "?"
regex = re.sub(r"(?<!\\)\((?!\?)", "(?:", str(regex))
instance._sched_lookup[regex] = [scheduler, priority, affinity]
for pid, (cmd, option, scheduler, priority, affinity, regex) \
in sched_all.items():
self._tune_process(pid, cmd, scheduler,
priority, affinity)
self._storage.set(self._scheduler_storage_key,
self._scheduler_original)
if self._daemon and instance._runtime_tuning:
instance._thread = threading.Thread(target = self._thread_code, args = [instance])
instance._thread.start()
def _restore_ps_affinity(self):
try:
ps = self.get_processes()
except (OSError, IOError) as e:
log.error("error unapplying tuning, cannot get information about running processes: %s"
% e)
return
for pid, orig_params in self._scheduler_original.items():
# if command line for the pid didn't change, it's very probably the same process
if pid not in ps or ps[pid] != orig_params.cmdline:
continue
if orig_params.scheduler is not None \
and orig_params.priority is not None:
self._set_rt(pid, orig_params.scheduler,
orig_params.priority)
if orig_params.cgroup is not None:
self._set_cgroup(pid, orig_params.cgroup)
elif orig_params.affinity is not None:
self._set_affinity(pid, orig_params.affinity)
self._scheduler_original = {}
self._storage.unset(self._scheduler_storage_key)
def _cgroup_cleanup_tasks_one(self, cgroup):
cnt = int(consts.CGROUP_CLEANUP_TASKS_RETRY)
data = " "
while data != "" and cnt > 0:
data = self._cmd.read_file("%s/%s/%s" % (self._cgroup_mount_point, cgroup, "tasks"),
err_ret = " ", no_error = True)
if data not in ["", " "]:
for l in data.split("\n"):
self._cmd.write_to_file("%s/%s" % (self._cgroup_mount_point, "tasks"), l, no_error = True)
cnt -= 1
if cnt == 0:
log.warn("Unable to cleanup tasks from cgroup '%s'" % cgroup)
def _cgroup_cleanup_tasks(self):
if self._cgroup is not None and not self._cgroup in self._cgroups:
self._cgroup_cleanup_tasks_one(self._cgroup)
for cg in self._cgroups:
self._cgroup_cleanup_tasks_one(cg)
def _instance_unapply_static(self, instance, rollback = consts.ROLLBACK_SOFT):
super(SchedulerPlugin, self)._instance_unapply_static(instance, rollback)
if self._daemon and instance._runtime_tuning:
instance._terminate.set()
instance._thread.join()
self._restore_ps_affinity()
self._cgroup_restore_affinity()
self._cgroup_cleanup_tasks()
if self._cgroup_groups_init or self._cgroup_mount_point_init:
self._cgroup_finalize_groups()
if self._cgroup_mount_point_init:
self._cgroup_finalize()
def _cgroup_verify_affinity_one(self, cgroup, affinity):
log.debug("Verifying cgroup '%s' affinity" % cgroup)
path = "%s/%s/%s" % (self._cgroup_mount_point, cgroup, "cpuset.cpus")
current_affinity = self._cmd.read_file(path, err_ret = "ERR", no_error = True)
if current_affinity == "ERR":
return True
current_affinity = self._cmd.cpulist2string(self._cmd.cpulist_pack(current_affinity))
affinity = self._cmd.cpulist2string(self._cmd.cpulist_pack(affinity))
affinity_description = "cgroup '%s' affinity" % cgroup
if current_affinity == affinity:
log.info(consts.STR_VERIFY_PROFILE_VALUE_OK
% (affinity_description, current_affinity))
return True
else:
log.error(consts.STR_VERIFY_PROFILE_VALUE_FAIL
% (affinity_description, current_affinity,
affinity))
return False
def _cgroup_verify_affinity(self):
log.debug("Veryfying cgroups affinities")
ret = True
if self._affinity is not None and self._cgroup is not None and not self._cgroup in self._cgroups:
ret = ret and self._cgroup_verify_affinity_one(self._cgroup, self._affinity)
for cg in self._cgroups.items():
ret = ret and self._cgroup_verify_affinity_one(cg[0], cg[1])
return ret
def _instance_verify_static(self, instance, ignore_missing, devices):
ret1 = super(SchedulerPlugin, self)._instance_verify_static(instance, ignore_missing, devices)
ret2 = self._cgroup_verify_affinity()
return ret1 and ret2
def _add_pid(self, instance, pid, r):
try:
cmd = self._get_cmdline(pid)
except (OSError, IOError) as e:
if e.errno == errno.ENOENT \
or e.errno == errno.ESRCH:
log.debug("Failed to get cmdline of PID %d, the task vanished."
% pid)
else:
log.error("Failed to get cmdline of PID %d: %s"
% (pid, e))
return
v = self._cmd.re_lookup(instance._sched_lookup, cmd, r)
if v is not None and not pid in self._scheduler_original:
log.debug("tuning new process '%s' with PID '%d' by '%s'" % (cmd, pid, str(v)))
(sched, prio, affinity) = v
self._tune_process(pid, cmd, sched, prio,
affinity)
self._storage.set(self._scheduler_storage_key,
self._scheduler_original)
def _remove_pid(self, instance, pid):
if pid in self._scheduler_original:
del self._scheduler_original[pid]
log.debug("removed PID %d from the rollback database" % pid)
self._storage.set(self._scheduler_storage_key,
self._scheduler_original)
def _thread_code(self, instance):
r = self._cmd.re_lookup_compile(instance._sched_lookup)
poll = select.poll()
# Store the file objects in a local variable so that they don't
# go out of scope too soon. This is a workaround for
# python3-perf bug rhbz#1659445.
fds = instance._evlist.get_pollfd()
for fd in fds:
poll.register(fd)
while not instance._terminate.is_set():
# timeout to poll in milliseconds
if len(poll.poll(self._sleep_interval * 1000)) > 0 and not instance._terminate.is_set():
read_events = True
while read_events:
read_events = False
for cpu in self._cpus:
event = instance._evlist.read_on_cpu(cpu)
if event:
read_events = True
if event.type == perf.RECORD_COMM or \
(self._perf_process_fork_value and event.type == perf.RECORD_FORK):
self._add_pid(instance, int(event.tid), r)
elif event.type == perf.RECORD_EXIT:
self._remove_pid(instance, int(event.tid))
@command_custom("cgroup_ps_blacklist", per_device = False)
def _cgroup_ps_blacklist(self, enabling, value, verify, ignore_missing):
# currently unsupported
if verify:
return None
if enabling and value is not None:
self._cgroup_ps_blacklist_re = "|".join(["(%s)" % v for v in re.split(r"(?<!\\);", str(value))])
@command_custom("ps_whitelist", per_device = False)
def _ps_whitelist(self, enabling, value, verify, ignore_missing):
# currently unsupported
if verify:
return None
if enabling and value is not None:
self._ps_whitelist = "|".join(["(%s)" % v for v in re.split(r"(?<!\\);", str(value))])
@command_custom("ps_blacklist", per_device = False)
def _ps_blacklist(self, enabling, value, verify, ignore_missing):
# currently unsupported
if verify:
return None
if enabling and value is not None:
self._ps_blacklist = "|".join(["(%s)" % v for v in re.split(r"(?<!\\);", str(value))])
@command_custom("irq_process", per_device = False)
def _irq_process(self, enabling, value, verify, ignore_missing):
# currently unsupported
if verify:
return None
if enabling and value is not None:
self._irq_process = self._cmd.get_bool(value) == "1"
@command_custom("default_irq_smp_affinity", per_device = False)
def _default_irq_smp_affinity(self, enabling, value, verify, ignore_missing):
# currently unsupported
if verify:
return None
if enabling and value is not None:
if value in ["calc", "ignore"]:
self._default_irq_smp_affinity_value = value
else:
self._default_irq_smp_affinity_value = self._cmd.cpulist_unpack(value)
@command_custom("perf_process_fork", per_device = False)
def _perf_process_fork(self, enabling, value, verify, ignore_missing):
# currently unsupported
if verify:
return None
if enabling and value is not None:
self._perf_process_fork_value = self._cmd.get_bool(value) == "1"
# Raises OSError
# Raises SystemError with old (pre-0.4) python-schedutils
# instead of OSError
# If PID doesn't exist, errno == ESRCH
def _get_affinity(self, pid):
res = self._scheduler_utils.get_affinity(pid)
log.debug("Read affinity '%s' of PID %d" % (res, pid))
return res
def _set_affinity(self, pid, affinity):
log.debug("Setting CPU affinity of PID %d to '%s'." % (pid, affinity))
try:
self._scheduler_utils.set_affinity(pid, affinity)
return True
# Workaround for old python-schedutils (pre-0.4) which
# incorrectly raised SystemError instead of OSError
except (SystemError, OSError) as e:
if hasattr(e, "errno") and e.errno == errno.ESRCH:
log.debug("Failed to set affinity of PID %d, the task vanished."
% pid)
else:
res = self._affinity_changeable(pid)
if res == 1 or res == -2:
log.error("Failed to set affinity of PID %d to '%s': %s"
% (pid, affinity, e))
return False
# returns intersection of affinity1 with affinity2, if intersection is empty it returns affinity3
def _get_intersect_affinity(self, affinity1, affinity2, affinity3):
aff = set(affinity1).intersection(set(affinity2))
if aff:
return list(aff)
return affinity3
def _set_all_obj_affinity(self, objs, affinity, threads = False):
psl = [v for v in objs if re.search(self._ps_whitelist,
self._get_stat_comm(v)) is not None]
if self._ps_blacklist != "":
psl = [v for v in psl if re.search(self._ps_blacklist,
self._get_stat_comm(v)) is None]
if self._cgroup_ps_blacklist_re != "":
psl = [v for v in psl if re.search(self._cgroup_ps_blacklist_re,
self._get_stat_cgroup(v)) is None]
psd = dict([(v.pid, v) for v in psl])
for pid in psd:
try:
cmd = self._get_cmdline(psd[pid])
except (OSError, IOError) as e:
if e.errno == errno.ENOENT \
or e.errno == errno.ESRCH:
log.debug("Failed to get cmdline of PID %d, the task vanished."
% pid)
else:
log.error("Refusing to set affinity of PID %d, failed to get its cmdline: %s"
% (pid, e))
continue
cont = self._tune_process_affinity(pid, affinity,
intersect = True)
if not cont:
continue
if pid in self._scheduler_original:
self._scheduler_original[pid].cmdline = cmd
# process threads
if not threads and "threads" in psd[pid]:
self._set_all_obj_affinity(
psd[pid]["threads"].values(),
affinity, True)
def _get_stat_cgroup(self, o):
try:
return o["cgroups"]
except (OSError, IOError, KeyError):
return ""
def _get_stat_comm(self, o):
try:
return o["stat"]["comm"]
except (OSError, IOError, KeyError):
return ""
def _set_ps_affinity(self, affinity):
try:
ps = procfs.pidstats()
ps.reload_threads()
self._set_all_obj_affinity(ps.values(), affinity, False)
except (OSError, IOError) as e:
log.error("error applying tuning, cannot get information about running processes: %s"
% e)
# Returns 0 on success, -2 if changing the affinity is not
# supported, -1 if some other error occurs.
def _set_irq_affinity(self, irq, affinity, restoring):
try:
affinity_hex = self._cmd.cpulist2hex(affinity)
log.debug("Setting SMP affinity of IRQ %s to '%s'"
% (irq, affinity_hex))
filename = "/proc/irq/%s/smp_affinity" % irq
with open(filename, "w") as f:
f.write(affinity_hex)
return 0
except (OSError, IOError) as e:
# EIO is returned by
# kernel/irq/proc.c:write_irq_affinity() if changing
# the affinity is not supported
# (at least on kernels 3.10 and 4.18)
if hasattr(e, "errno") and e.errno == errno.EIO \
and not restoring:
log.debug("Setting SMP affinity of IRQ %s is not supported"
% irq)
return -2
else:
log.error("Failed to set SMP affinity of IRQ %s to '%s': %s"
% (irq, affinity_hex, e))
return -1
def _set_default_irq_affinity(self, affinity):
try:
affinity_hex = self._cmd.cpulist2hex(affinity)
log.debug("Setting default SMP IRQ affinity to '%s'"
% affinity_hex)
with open("/proc/irq/default_smp_affinity", "w") as f:
f.write(affinity_hex)
except (OSError, IOError) as e:
log.error("Failed to set default SMP IRQ affinity to '%s': %s"
% (affinity_hex, e))
def _set_all_irq_affinity(self, affinity):
irq_original = IRQAffinities()
irqs = procfs.interrupts()
for irq in irqs.keys():
try:
prev_affinity = irqs[irq]["affinity"]
log.debug("Read affinity of IRQ '%s': '%s'"
% (irq, prev_affinity))
except KeyError:
continue
_affinity = self._get_intersect_affinity(prev_affinity, affinity, affinity)
if set(_affinity) == set(prev_affinity):
continue
res = self._set_irq_affinity(irq, _affinity, False)
if res == 0:
irq_original.irqs[irq] = prev_affinity
elif res == -2:
irq_original.unchangeable.append(irq)
# default affinity
prev_affinity_hex = self._cmd.read_file("/proc/irq/default_smp_affinity")
prev_affinity = self._cmd.hex2cpulist(prev_affinity_hex)
if self._default_irq_smp_affinity_value == "calc":
_affinity = self._get_intersect_affinity(prev_affinity, affinity, affinity)
elif self._default_irq_smp_affinity_value != "ignore":
_affinity = self._default_irq_smp_affinity_value
if self._default_irq_smp_affinity_value != "ignore":
self._set_default_irq_affinity(_affinity)
irq_original.default = prev_affinity
self._storage.set(self._irq_storage_key, irq_original)
def _restore_all_irq_affinity(self):
irq_original = self._storage.get(self._irq_storage_key, None)
if irq_original is None:
return
for irq, affinity in irq_original.irqs.items():
self._set_irq_affinity(irq, affinity, True)
if self._default_irq_smp_affinity_value != "ignore":
affinity = irq_original.default
self._set_default_irq_affinity(affinity)
self._storage.unset(self._irq_storage_key)
def _verify_irq_affinity(self, irq_description, correct_affinity,
current_affinity):
res = set(current_affinity).issubset(set(correct_affinity))
if res:
log.info(consts.STR_VERIFY_PROFILE_VALUE_OK
% (irq_description, current_affinity))
else:
log.error(consts.STR_VERIFY_PROFILE_VALUE_FAIL
% (irq_description, current_affinity,
correct_affinity))
return res
def _verify_all_irq_affinity(self, correct_affinity, ignore_missing):
irq_original = self._storage.get(self._irq_storage_key, None)
irqs = procfs.interrupts()
res = True
for irq in irqs.keys():
if irq in irq_original.unchangeable and ignore_missing:
description = "IRQ %s does not support changing SMP affinity" % irq
log.info(consts.STR_VERIFY_PROFILE_VALUE_MISSING % description)
continue
try:
current_affinity = irqs[irq]["affinity"]
log.debug("Read SMP affinity of IRQ '%s': '%s'"
% (irq, current_affinity))
irq_description = "SMP affinity of IRQ %s" % irq
if not self._verify_irq_affinity(
irq_description,
correct_affinity,
current_affinity):
res = False
except KeyError:
continue
current_affinity_hex = self._cmd.read_file(
"/proc/irq/default_smp_affinity")
current_affinity = self._cmd.hex2cpulist(current_affinity_hex)
if self._default_irq_smp_affinity_value != "ignore" and not self._verify_irq_affinity("default IRQ SMP affinity",
current_affinity, correct_affinity if self._default_irq_smp_affinity_value == "calc" else
self._default_irq_smp_affinity_value):
res = False
return res
@command_custom("isolated_cores", per_device = False, priority = 10)
def _isolated_cores(self, enabling, value, verify, ignore_missing):
affinity = None
self._affinity = None
if value is not None:
isolated = set(self._cmd.cpulist_unpack(value))
present = set(self._cpus)
if isolated.issubset(present):
affinity = list(present - isolated)
self._affinity = self._cmd.cpulist2string(affinity)
else:
str_cpus = self._cmd.cpulist2string(self._cpus)
log.error("Invalid isolated_cores specified, '%s' does not match available cores '%s'"
% (value, str_cpus))
if (enabling or verify) and affinity is None:
return None
# currently only IRQ affinity verification is supported
if verify:
if self._irq_process:
return self._verify_all_irq_affinity(affinity, ignore_missing)
return True
elif enabling:
if self._cgroup:
self._cgroup_set_affinity()
ps_affinity = "cgroup.%s" % self._cgroup
else:
ps_affinity = affinity
self._set_ps_affinity(ps_affinity)
if self._irq_process:
self._set_all_irq_affinity(affinity)
else:
# Restoring processes' affinity is done in
# _instance_unapply_static()
if self._irq_process:
self._restore_all_irq_affinity()
def _get_sched_knob_path(self, prefix, namespace, knob):
key = "%s_%s_%s" % (prefix, namespace, knob)
path = self._sched_knob_paths_cache.get(key)
if path:
return path
path = "/proc/sys/kernel/%s_%s" % (namespace, knob)
if not os.path.exists(path):
if prefix == "":
path = "%s/%s" % (namespace, knob)
else:
path = "%s/%s/%s" % (prefix, namespace, knob)
path = "/sys/kernel/debug/%s" % path
if self._secure_boot_hint is None:
self._secure_boot_hint = True
self._sched_knob_paths_cache[key] = path
return path
def _get_sched_knob(self, prefix, namespace, knob):
data = self._cmd.read_file(self._get_sched_knob_path(prefix, namespace, knob), err_ret = None)
if data is None:
log.error("Error reading '%s'" % knob)
if self._secure_boot_hint:
log.error("This may not work with Secure Boot or kernel_lockdown (this hint is logged only once)")
self._secure_boot_hint = False
return data
def _set_sched_knob(self, prefix, namespace, knob, value, sim, remove = False):
if value is None:
return None
if not sim:
if not self._cmd.write_to_file(self._get_sched_knob_path(prefix, namespace, knob), value, \
no_error = [errno.ENOENT] if remove else False):
log.error("Error writing value '%s' to '%s'" % (value, knob))
return value
@command_get("sched_min_granularity_ns")
def _get_sched_min_granularity_ns(self):
return self._get_sched_knob("", "sched", "min_granularity_ns")
@command_set("sched_min_granularity_ns")
def _set_sched_min_granularity_ns(self, value, sim, remove):
return self._set_sched_knob("", "sched", "min_granularity_ns", value, sim, remove)
@command_get("sched_latency_ns")
def _get_sched_latency_ns(self):
return self._get_sched_knob("", "sched", "latency_ns")
@command_set("sched_latency_ns")
def _set_sched_latency_ns(self, value, sim, remove):
return self._set_sched_knob("", "sched", "latency_ns", value, sim, remove)
@command_get("sched_wakeup_granularity_ns")
def _get_sched_wakeup_granularity_ns(self):
return self._get_sched_knob("", "sched", "wakeup_granularity_ns")
@command_set("sched_wakeup_granularity_ns")
def _set_sched_wakeup_granularity_ns(self, value, sim, remove):
return self._set_sched_knob("", "sched", "wakeup_granularity_ns", value, sim, remove)
@command_get("sched_tunable_scaling")
def _get_sched_tunable_scaling(self):
return self._get_sched_knob("", "sched", "tunable_scaling")
@command_set("sched_tunable_scaling")
def _set_sched_tunable_scaling(self, value, sim, remove):
return self._set_sched_knob("", "sched", "tunable_scaling", value, sim, remove)
@command_get("sched_migration_cost_ns")
def _get_sched_migration_cost_ns(self):
return self._get_sched_knob("", "sched", "migration_cost_ns")
@command_set("sched_migration_cost_ns")
def _set_sched_migration_cost_ns(self, value, sim, remove):
return self._set_sched_knob("", "sched", "migration_cost_ns", value, sim, remove)
@command_get("sched_nr_migrate")
def _get_sched_nr_migrate(self):
return self._get_sched_knob("", "sched", "nr_migrate")
@command_set("sched_nr_migrate")
def _set_sched_nr_migrate(self, value, sim, remove):
return self._set_sched_knob("", "sched", "nr_migrate", value, sim, remove)
@command_get("numa_balancing_scan_delay_ms")
def _get_numa_balancing_scan_delay_ms(self):
return self._get_sched_knob("sched", "numa_balancing", "scan_delay_ms")
@command_set("numa_balancing_scan_delay_ms")
def _set_numa_balancing_scan_delay_ms(self, value, sim, remove):
return self._set_sched_knob("sched", "numa_balancing", "scan_delay_ms", value, sim, remove)
@command_get("numa_balancing_scan_period_min_ms")
def _get_numa_balancing_scan_period_min_ms(self):
return self._get_sched_knob("sched", "numa_balancing", "scan_period_min_ms")
@command_set("numa_balancing_scan_period_min_ms")
def _set_numa_balancing_scan_period_min_ms(self, value, sim, remove):
return self._set_sched_knob("sched", "numa_balancing", "scan_period_min_ms", value, sim, remove)
@command_get("numa_balancing_scan_period_max_ms")
def _get_numa_balancing_scan_period_max_ms(self):
return self._get_sched_knob("sched", "numa_balancing", "scan_period_max_ms")
@command_set("numa_balancing_scan_period_max_ms")
def _set_numa_balancing_scan_period_max_ms(self, value, sim, remove):
return self._set_sched_knob("sched", "numa_balancing", "scan_period_max_ms", value, sim, remove)
@command_get("numa_balancing_scan_size_mb")
def _get_numa_balancing_scan_size_mb(self):
return self._get_sched_knob("sched", "numa_balancing", "scan_size_mb")
@command_set("numa_balancing_scan_size_mb")
def _set_numa_balancing_scan_size_mb(self, value, sim, remove):
return self._set_sched_knob("sched", "numa_balancing", "scan_size_mb", value, sim, remove)