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authorPhil Auld <pauld@redhat.com>2020-06-29 22:23:03 +0300
committerPeter Zijlstra <peterz@infradead.org>2020-07-08 12:39:02 +0300
commit9d246053a69196c7c27068870e9b4b66ac536f68 (patch)
tree25cd59b9266c05a1bd7aab1792d084860f2965f6 /include/trace/events/sched.h
parent07bbecb3410617816a99e76a2df7576507a0c8ad (diff)
downloadlinux-9d246053a69196c7c27068870e9b4b66ac536f68.tar.xz
sched: Add a tracepoint to track rq->nr_running
Add a bare tracepoint trace_sched_update_nr_running_tp which tracks ->nr_running CPU's rq. This is used to accurately trace this data and provide a visualization of scheduler imbalances in, for example, the form of a heat map. The tracepoint is accessed by loading an external kernel module. An example module (forked from Qais' module and including the pelt related tracepoints) can be found at: https://github.com/auldp/tracepoints-helpers.git A script to turn the trace-cmd report output into a heatmap plot can be found at: https://github.com/jirvoz/plot-nr-running The tracepoints are added to add_nr_running() and sub_nr_running() which are in kernel/sched/sched.h. In order to avoid CREATE_TRACE_POINTS in the header a wrapper call is used and the trace/events/sched.h include is moved before sched.h in kernel/sched/core. Signed-off-by: Phil Auld <pauld@redhat.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lkml.kernel.org/r/20200629192303.GC120228@lorien.usersys.redhat.com
Diffstat (limited to 'include/trace/events/sched.h')
-rw-r--r--include/trace/events/sched.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/include/trace/events/sched.h b/include/trace/events/sched.h
index 04f9a4c7b0d9..0d5ff0958d48 100644
--- a/include/trace/events/sched.h
+++ b/include/trace/events/sched.h
@@ -642,6 +642,10 @@ DECLARE_TRACE(sched_util_est_se_tp,
TP_PROTO(struct sched_entity *se),
TP_ARGS(se));
+DECLARE_TRACE(sched_update_nr_running_tp,
+ TP_PROTO(struct rq *rq, int change),
+ TP_ARGS(rq, change));
+
#endif /* _TRACE_SCHED_H */
/* This part must be outside protection */