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| author | Andrea Righi <andrea.righi@linux.dev> | 2024-09-21 21:39:21 +0200 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2024-09-23 18:53:02 +0200 |
| commit | 431844b65f4c1b988ccd886f2ed29c138f7bb262 (patch) | |
| tree | 3d84bd26e2e6c1be937bc39c65a2fbbf947abb1b /tools/sched_ext | |
| parent | sched_ext: Fix build when !CONFIG_STACKTRACE (diff) | |
| download | linux-431844b65f4c1b988ccd886f2ed29c138f7bb262.tar.xz linux-431844b65f4c1b988ccd886f2ed29c138f7bb262.zip | |
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>
Diffstat (limited to 'tools/sched_ext')
| -rw-r--r-- | tools/sched_ext/scx_show_state.py | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/tools/sched_ext/scx_show_state.py b/tools/sched_ext/scx_show_state.py index d457d2a74e1e..8bc626ede1c4 100644 --- a/tools/sched_ext/scx_show_state.py +++ b/tools/sched_ext/scx_show_state.py @@ -37,3 +37,4 @@ print(f'switched_all : {read_static_key("__scx_switched_all")}') print(f'enable_state : {ops_state_str(enable_state)} ({enable_state})') print(f'bypass_depth : {read_atomic("scx_ops_bypass_depth")}') print(f'nr_rejected : {read_atomic("scx_nr_rejected")}') +print(f'enable_seq : {read_atomic("scx_enable_seq")}') |