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linux/Documentation/scheduler
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Andrea Righi 431844b65f sched_ext: Provide a sysfs enable_seq counter 
As discussed during the distro-centric session within the sched_ext
Microconference at LPC 2024, introduce a sequence counter that is
incremented every time a BPF scheduler is loaded.

This feature can help distributions in diagnosing potential performance
regressions by identifying systems where users are running (or have ran)
custom BPF schedulers.

Example:

 arighi@virtme-ng~> cat /sys/kernel/sched_ext/enable_seq
 0
 arighi@virtme-ng~> sudo scx_simple
 local=1 global=0
 ^CEXIT: unregistered from user space
 arighi@virtme-ng~> cat /sys/kernel/sched_ext/enable_seq
 1

In this way user-space tools (such as Ubuntu's apport and similar) are
able to gather and include this information in bug reports.

Cc: Giovanni Gherdovich <giovanni.gherdovich@suse.com>
Cc: Kleber Sacilotto de Souza <kleber.souza@canonical.com>
Cc: Marcelo Henrique Cerri <marcelo.cerri@canonical.com>
Cc: Phil Auld <pauld@redhat.com>
Signed-off-by: Andrea Righi <andrea.righi@linux.dev>
Signed-off-by: Tejun Heo <tj@kernel.org>
2024-09-23 06:53:02 -10:00
..
completion.rst docs: scheduler: completion: Update member of struct completion 2024-09-05 14:17:45 -06:00
index.rst sched_ext: Initial pull request for v6.12 2024-09-21 09:44:57 -07:00
membarrier.rst membarrier: Create Documentation/scheduler/membarrier.rst 2024-02-15 08:04:12 -08:00
sched-arch.rst Documentation: Drop or replace remaining mentions of IA64 2023-09-11 08:13:18 +00:00
sched-bwc.rst Documentation: Fix typos 2023-08-18 11:29:03 -06:00
sched-capacity.rst sched/topology: Consolidate and clean up access to a CPU's max compute capacity 2023-10-09 12:59:48 +02:00
sched-deadline.rst sched/deadline: Convert schedtool example to chrt 2024-09-11 11:23:56 +02:00
sched-debug.rst sched/numa-balancing: Move some document to make it consistent with the code 2022-02-11 23:30:08 +01:00
sched-design-CFS.rst docs: scheduler: Start documenting the EEVDF scheduler 2024-08-07 13:37:16 -06:00
sched-domains.rst sched/balancing: Rename load_balance() => sched_balance_rq() 2024-03-12 12:00:00 +01:00
sched-eevdf.rst docs: scheduler: Start documenting the EEVDF scheduler 2024-08-07 13:37:16 -06:00
sched-energy.rst sched/topology: Remove the EM_MAX_COMPLEXITY limit 2023-10-09 13:07:27 +02:00
sched-ext.rst sched_ext: Provide a sysfs enable_seq counter 2024-09-23 06:53:02 -10:00
sched-nice-design.rst Documentation: scheduler: fixed 2 typos in sched-nice-design.rst 2021-05-17 12:42:59 -06:00
sched-pelt.c
sched-rt-group.rst sched/rt/docs: Use 'real-time' instead of 'realtime' 2023-10-02 15:17:14 +02:00
sched-stats.rst sched/balancing: Rename load_balance() => sched_balance_rq() 2024-03-12 12:00:00 +01:00
sched-util-clamp.rst sched/documentation: Document the util clamp feature 2023-01-05 12:08:34 +01:00
schedutil.rst sched/fair: Remove SCHED_FEAT(UTIL_EST_FASTUP, true) 2023-12-23 15:59:56 +01:00
text_files.rst