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| author | Davidlohr Bueso <dave@stgolabs.net> | 2015-02-02 09:16:24 +0300 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2015-02-04 09:57:42 +0300 |
| commit | afffc6c1805d98e08e778cddb644a666e78cfcfd (patch) | |
| tree | 86ad29607790194934447f45787de73314bd5397 /tools/perf/util/parse-events.c | |
| parent | 73105994c57d06e40a33ab5a716db04e898b4c05 (diff) | |
| download | linux-afffc6c1805d98e08e778cddb644a666e78cfcfd.tar.xz | |
locking/rtmutex: Optimize setting task running after being blocked
We explicitly mark the task running after returning from
a __rt_mutex_slowlock() call, which does the actual sleeping
via wait-wake-trylocking. As such, this patch does two things:
(1) refactors the code so that setting current to TASK_RUNNING
is done by __rt_mutex_slowlock(), and not by the callers. The
downside to this is that it becomes a bit unclear when at what
point we block. As such I've added a comment that the task
blocks when calling __rt_mutex_slowlock() so readers can figure
out when it is running again.
(2) relaxes setting current's state through __set_current_state(),
instead of it's more expensive barrier alternative. There was no
need for the implied barrier as we're obviously not planning on
blocking.
Signed-off-by: Davidlohr Bueso <dbueso@suse.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: http://lkml.kernel.org/r/1422857784.18096.1.camel@stgolabs.net
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'tools/perf/util/parse-events.c')
0 files changed, 0 insertions, 0 deletions