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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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