diff options
| author | Ingo Molnar <mingo@kernel.org> | 2017-11-07 10:30:18 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2017-11-07 10:30:18 +0100 |
| commit | 15bcdc9477b03eb035052412c3a087e11e855e76 (patch) | |
| tree | e1e3c1f2b89e3a705d1737d61a4d8a9394a1930e /drivers/idle | |
| parent | 340b5319c98eb14f7a70947a38e17d06f5beea88 (diff) | |
| parent | e4880bc5dfb1f02b152e62a894b5c6f3e995b3cf (diff) | |
Merge branch 'linus' into perf/core, to fix conflicts
Conflicts:
tools/perf/arch/arm/annotate/instructions.c
tools/perf/arch/arm64/annotate/instructions.c
tools/perf/arch/powerpc/annotate/instructions.c
tools/perf/arch/s390/annotate/instructions.c
tools/perf/arch/x86/tests/intel-cqm.c
tools/perf/ui/tui/progress.c
tools/perf/util/zlib.c
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'drivers/idle')
| -rw-r--r-- | drivers/idle/intel_idle.c | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/drivers/idle/intel_idle.c b/drivers/idle/intel_idle.c index 5dc7ea4b6bc4..f0b06b14e782 100644 --- a/drivers/idle/intel_idle.c +++ b/drivers/idle/intel_idle.c @@ -913,15 +913,16 @@ static __cpuidle int intel_idle(struct cpuidle_device *dev, struct cpuidle_state *state = &drv->states[index]; unsigned long eax = flg2MWAIT(state->flags); unsigned int cstate; + int cpu = smp_processor_id(); cstate = (((eax) >> MWAIT_SUBSTATE_SIZE) & MWAIT_CSTATE_MASK) + 1; /* - * NB: if CPUIDLE_FLAG_TLB_FLUSHED is set, this idle transition - * will probably flush the TLB. It's not guaranteed to flush - * the TLB, though, so it's not clear that we can do anything - * useful with this knowledge. + * leave_mm() to avoid costly and often unnecessary wakeups + * for flushing the user TLB's associated with the active mm. */ + if (state->flags & CPUIDLE_FLAG_TLB_FLUSHED) + leave_mm(cpu); if (!(lapic_timer_reliable_states & (1 << (cstate)))) tick_broadcast_enter(); |