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| author | Peter Zijlstra <peterz@infradead.org> | 2016-03-17 14:06:58 (GMT) |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2016-03-21 08:08:16 (GMT) |
| commit | c2872d381f1ab1bc39c7f044644bf1d3da7c11dd (patch) | |
| tree | d251a6b32d926af9e2db2e3417407aa09706d06b | |
| parent | 5a50f52917011365a4a2c0f1d2cea0990c4465cd (diff) | |
| download | linux-c2872d381f1ab1bc39c7f044644bf1d3da7c11dd.tar.xz | |
perf/x86/ibs: Add IBS interrupt to the dynamic throttle
Interrupt throttling is normally only done against
sysctl_perf_event_sample_rate. This means that if that number is too
high (for whatever reason) you can lock up your machine.
We have, however, a dynamic throttling scheme too, but for that to
work, we need to add a callback to the interrupt handler, IBS did not
have this, so add it.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
| -rw-r--r-- | arch/x86/events/amd/ibs.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/x86/events/amd/ibs.c b/arch/x86/events/amd/ibs.c index c43a36d..3ea25c3 100644 --- a/arch/x86/events/amd/ibs.c +++ b/arch/x86/events/amd/ibs.c @@ -637,6 +637,7 @@ out: static int perf_ibs_nmi_handler(unsigned int cmd, struct pt_regs *regs) { + u64 stamp = sched_clock(); int handled = 0; handled += perf_ibs_handle_irq(&perf_ibs_fetch, regs); @@ -645,6 +646,8 @@ perf_ibs_nmi_handler(unsigned int cmd, struct pt_regs *regs) if (handled) inc_irq_stat(apic_perf_irqs); + perf_sample_event_took(sched_clock() - stamp); + return handled; } NOKPROBE_SYMBOL(perf_ibs_nmi_handler); |