Scheduler plugin uses perf event loop to catch newly created processes.
By default it listens to perf.RECORD_COMM and perf.RECORD_EXIT events.
By setting `perf_process_fork` parameter to `true` it will also listen
to perf.RECORD_FORK events, i.e. it will explicitly process
child processes created by the fork system call. Usually, child processes
inherit affinity from their parents, thus the `scheduler` plugin doesn't
need to explicitly process them, that's why the `perf_process_fork`
parameter is by default set to `false` and child processes aren't
explicitly processed. This default setting may also save some CPU time.
Resolves: rhbz#1894610
Signed-off-by: Jaroslav Škarvada <jskarvad@redhat.com>
The option 'default_irq_smp_affinity' affects what will be written to the
/proc/irq/default_smp_affinity. The option supports the following values:
calc:
Content of the /proc/irq/default_smp_affinity will be calculated from
the 'isolated_cores'. 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 the /proc/irq/default_smp_affinity is
written to the /proc/irq/default_smp_affinity. If the intersection is
empty set, then just the non-isolated cores are written to the
/proc/irq/default_smp_affinity. This behavior is the default if
option 'default_irq_smp_affinity' is not specified.
ignore:
The /proc/irq/default_smp_affinity is not touched by Tuned.
cpulist like e.g. '1,3-4':
The cpulist is unpacked and directly written to the
/proc/irq/default_smp_affinity
Examples:
[scheduler]
isolated_cores = 1, 2
default_irq_smp_affinity = calc
[scheduler]
isolated_cores = 1, 2
default_irq_smp_affinity = ignore
[scheduler]
isolated_cores = 1, 3
default_irq_smp_affinity = 2, 4
Resolves: rhbz#1896348
Signed-off-by: Jaroslav Škarvada <jskarvad@redhat.com>
