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`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`.
====
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