diff options
| author | Phil Auld <pauld@redhat.com> | 2020-06-29 15:23:03 -0400 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2020-07-08 11:39:02 +0200 |
| commit | 9d246053a69196c7c27068870e9b4b66ac536f68 (patch) | |
| tree | 25cd59b9266c05a1bd7aab1792d084860f2965f6 /kernel/sched/pelt.c | |
| parent | 07bbecb3410617816a99e76a2df7576507a0c8ad (diff) | |
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 'kernel/sched/pelt.c')
| -rw-r--r-- | kernel/sched/pelt.c | 2 |
1 files changed, 0 insertions, 2 deletions
diff --git a/kernel/sched/pelt.c b/kernel/sched/pelt.c index 11bea3b08115..2c613e1cff3a 100644 --- a/kernel/sched/pelt.c +++ b/kernel/sched/pelt.c @@ -28,8 +28,6 @@ #include "sched.h" #include "pelt.h" -#include <trace/events/sched.h> - /* * Approximate: * val * y^n, where y^32 ~= 0.5 (~1 scheduling period) |