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| author | Peter Zijlstra <peterz@infradead.org> | 2017-04-21 12:43:59 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2017-05-15 10:15:20 +0200 |
| commit | f9fccdb9efef60dbcf84d493514b475c41aa866f (patch) | |
| tree | 3d5278febf2aa2f0d8d2e05977c59bcd97fce350 /scripts/kernel-doc | |
| parent | 3067a33d5fec856bb297d58e7f03411d060ccdee (diff) | |
| download | linux-f9fccdb9efef60dbcf84d493514b475c41aa866f.tar.bz2 | |
cpuidle: Fix idle time tracking
Ville reported that on his Core2, which has TSC stop in idle, we would
always report very short idle durations. He tracked this down to
commit:
e93e59ce5b85 ("cpuidle: Replace ktime_get() with local_clock()")
which replaces ktime_get() with local_clock().
Add a sched_clock_idle_wakeup_event() call, which will re-sync the
clock with ktime_get_ns() when TSC is unstable and no-op otherwise.
Reported-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Tested-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Daniel Lezcano <daniel.lezcano@linaro.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rafael J . Wysocki <rafael.j.wysocki@intel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Fixes: e93e59ce5b85 ("cpuidle: Replace ktime_get() with local_clock()")
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'scripts/kernel-doc')
0 files changed, 0 insertions, 0 deletions