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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2013-11-01 12:54:51 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-11-01 12:54:51 -0700 |
| commit | 9581b7d2689ad9a0a20ddaec0427b46ad774585b (patch) | |
| tree | f2eb9c9e4f2066c2ff1a7a3853ee6231ef879c11 /arch | |
| parent | 9119e33e507d3b8fe234f2c2bafd3199ea2e883b (diff) | |
| parent | e8a923cc1fff6e627f906655ad52ee694ef2f6d7 (diff) | |
| download | lwn-9581b7d2689ad9a0a20ddaec0427b46ad774585b.tar.gz lwn-9581b7d2689ad9a0a20ddaec0427b46ad774585b.zip | |
Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull perf fixes from Ingo Molnar:
"Two fixes:
- Fix 'NMI handler took too long to run' false positives
[ Genuine NMI overhead speedups will come for v3.13, this commit
only fixes a measurement bug ]
- Fix perf ring-buffer missed barrier causing (rare) ring-buffer data
corruption on ppc64"
* 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
perf/x86: Fix NMI measurements
perf: Fix perf ring buffer memory ordering
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/kernel/cpu/perf_event.c | 6 | ||||
| -rw-r--r-- | arch/x86/kernel/nmi.c | 4 |
2 files changed, 5 insertions, 5 deletions
diff --git a/arch/x86/kernel/cpu/perf_event.c b/arch/x86/kernel/cpu/perf_event.c index 9d8449158cf9..8a87a3224121 100644 --- a/arch/x86/kernel/cpu/perf_event.c +++ b/arch/x86/kernel/cpu/perf_event.c @@ -1276,16 +1276,16 @@ void perf_events_lapic_init(void) static int __kprobes perf_event_nmi_handler(unsigned int cmd, struct pt_regs *regs) { - int ret; u64 start_clock; u64 finish_clock; + int ret; if (!atomic_read(&active_events)) return NMI_DONE; - start_clock = local_clock(); + start_clock = sched_clock(); ret = x86_pmu.handle_irq(regs); - finish_clock = local_clock(); + finish_clock = sched_clock(); perf_sample_event_took(finish_clock - start_clock); diff --git a/arch/x86/kernel/nmi.c b/arch/x86/kernel/nmi.c index ba77ebc2c353..6fcb49ce50a1 100644 --- a/arch/x86/kernel/nmi.c +++ b/arch/x86/kernel/nmi.c @@ -113,10 +113,10 @@ static int __kprobes nmi_handle(unsigned int type, struct pt_regs *regs, bool b2 u64 before, delta, whole_msecs; int remainder_ns, decimal_msecs, thishandled; - before = local_clock(); + before = sched_clock(); thishandled = a->handler(type, regs); handled += thishandled; - delta = local_clock() - before; + delta = sched_clock() - before; trace_nmi_handler(a->handler, (int)delta, thishandled); if (delta < nmi_longest_ns) |