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authorAndrea Righi <andrea.righi@linux.dev>2024-09-21 21:39:21 +0200
committerTejun Heo <tj@kernel.org>2024-09-23 18:53:02 +0200
commit431844b65f4c1b988ccd886f2ed29c138f7bb262 (patch)
tree3d84bd26e2e6c1be937bc39c65a2fbbf947abb1b /tools
parentsched_ext: Fix build when !CONFIG_STACKTRACE (diff)
downloadlinux-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')
-rw-r--r--tools/sched_ext/scx_show_state.py1
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")}')