[PATCH] Powerpc/perf: Wire up PMI throttling
From: Ravi Bangoria <hidden>
Date: 2018-11-14 14:14:28
Also in:
lkml
Subsystem:
linux for powerpc (32-bit and 64-bit), the rest · Maintainers:
Madhavan Srinivasan, Linus Torvalds
Commit 14c63f17b1fde ("perf: Drop sample rate when sampling is too
slow") introduced a way to throttle PMU interrupts if we're spending
too much time just processing those. Wire up powerpc PMI handler to
use this infrastructure.
Signed-off-by: Ravi Bangoria <redacted>
---
arch/powerpc/kernel/traps.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c
index 9a86572db1ef..44f85fa22356 100644
--- a/arch/powerpc/kernel/traps.c
+++ b/arch/powerpc/kernel/traps.c@@ -18,6 +18,7 @@ #include <linux/errno.h> #include <linux/sched.h> #include <linux/sched/debug.h> +#include <linux/sched/clock.h> #include <linux/kernel.h> #include <linux/mm.h> #include <linux/pkeys.h>
@@ -1803,9 +1804,12 @@ void vsx_unavailable_tm(struct pt_regs *regs) void performance_monitor_exception(struct pt_regs *regs) { + u64 start_clock; __this_cpu_inc(irq_stat.pmu_irqs); + start_clock = sched_clock(); perf_irq(regs); + perf_sample_event_took(sched_clock() - start_clock); } #ifdef CONFIG_PPC_ADV_DEBUG_REGS
--
2.19.1