diff options
| author | Mel Gorman <mgorman@techsingularity.net> | 2020-02-24 09:52:12 +0000 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2020-02-24 11:36:32 +0100 |
| commit | f22aef4afb0d6cc22e408d8254cf6d02d7982ef1 (patch) | |
| tree | 8db2a1ecebd256e630601d6f55f2737d1729299e /kernel/sched | |
| parent | 546121b65f47384e11ec1fa2e55449fc9f4846b2 (diff) | |
| download | linux-f22aef4afb0d6cc22e408d8254cf6d02d7982ef1.tar.gz | |
sched/numa: Trace when no candidate CPU was found on the preferred node
sched:sched_stick_numa is meant to fire when a task is unable to migrate to the preferred node. The case where no candidate CPU could be found is not traced which is an important gap. The tracepoint is not fired when the task is not allowed to run on any CPU on the preferred node or the task is already running on the target CPU but neither are interesting corner cases. Signed-off-by: Mel Gorman <mgorman@techsingularity.net> Signed-off-by: Ingo Molnar <mingo@kernel.org> Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Vincent Guittot <vincent.guittot@linaro.org> Cc: Juri Lelli <juri.lelli@redhat.com> Cc: Dietmar Eggemann <dietmar.eggemann@arm.com> Cc: Valentin Schneider <valentin.schneider@arm.com> Cc: Phil Auld <pauld@redhat.com> Cc: Hillf Danton <hdanton@sina.com> Link: https://lore.kernel.org/r/20200224095223.13361-3-mgorman@techsingularity.net
Diffstat (limited to 'kernel/sched')
| -rw-r--r-- | kernel/sched/fair.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index f38ff5a335d3..f524ce3cea82 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -1848,8 +1848,10 @@ static int task_numa_migrate(struct task_struct *p) } /* No better CPU than the current one was found. */ - if (env.best_cpu == -1) + if (env.best_cpu == -1) { + trace_sched_stick_numa(p, env.src_cpu, -1); return -EAGAIN; + } best_rq = cpu_rq(env.best_cpu); if (env.best_task == NULL) { |