Commit-ID: c2872d381f1ab1bc39c7f044644bf1d3da7c11dd
Gitweb: http://git.kernel.org/tip/c2872d381f1ab1bc39c7f044644bf1d3da7c11dd
Author: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
AuthorDate: Thu, 17 Mar 2016 15:06:58 +0100
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Mon, 21 Mar 2016 09:08:16 +0100
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@xxxxxxxxxxxxx>
Cc: Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx>
Cc: Andy Lutomirski <luto@xxxxxxxxxxxxxx>
Cc: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Cc: Brian Gerst <brgerst@xxxxxxxxx>
Cc: David Ahern <dsahern@xxxxxxxxx>
Cc: Denys Vlasenko <dvlasenk@xxxxxxxxxx>
Cc: H. Peter Anvin <hpa@xxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Stephane Eranian <eranian@xxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Vince Weaver <vincent.weaver@xxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
arch/x86/events/amd/ibs.c | 3 +++
1 file changed, 3 insertions(+)
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);
--
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