[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-Id: <1426811369-24565-4-git-send-email-andi@firstfloor.org>
Date: Thu, 19 Mar 2015 17:29:29 -0700
From: Andi Kleen <andi@...stfloor.org>
To: x86@...nel.org
Cc: linux-kernel@...r.kernel.org, peterz@...radead.org,
Andi Kleen <ak@...ux.intel.com>
Subject: [PATCH 3/3] x86, perf: Trace rdpmc too
From: Andi Kleen <ak@...ux.intel.com>
perf uses RDPMC to read the performance counters, so it's useful to trace
that too. Add a trace point for RDPMC too, similar to the existing
MSR ones. Since there is only a single call of rdpmc in the whole kernel
(in perf)
just add the trace statement to that call, instead of moving the rdpmcl
inline out of line.
Signed-off-by: Andi Kleen <ak@...ux.intel.com>
---
arch/x86/kernel/cpu/perf_event.c | 3 +++
include/trace/events/msr.h | 6 ++++++
2 files changed, 9 insertions(+)
diff --git a/arch/x86/kernel/cpu/perf_event.c b/arch/x86/kernel/cpu/perf_event.c
index e0dab5c..9644d95 100644
--- a/arch/x86/kernel/cpu/perf_event.c
+++ b/arch/x86/kernel/cpu/perf_event.c
@@ -26,6 +26,8 @@
#include <linux/bitops.h>
#include <linux/device.h>
+#include <trace/events/msr.h>
+
#include <asm/apic.h>
#include <asm/stacktrace.h>
#include <asm/nmi.h>
@@ -82,6 +84,7 @@ u64 x86_perf_event_update(struct perf_event *event)
again:
prev_raw_count = local64_read(&hwc->prev_count);
rdpmcl(hwc->event_base_rdpmc, new_raw_count);
+ trace_rdpmc(hwc->event_base_rdpmc, new_raw_count, 0);
if (local64_cmpxchg(&hwc->prev_count, prev_raw_count,
new_raw_count) != prev_raw_count)
diff --git a/include/trace/events/msr.h b/include/trace/events/msr.h
index e1677e8..4fa81b5 100644
--- a/include/trace/events/msr.h
+++ b/include/trace/events/msr.h
@@ -40,6 +40,12 @@ DEFINE_EVENT(msr_trace_class, write_msr,
TP_ARGS(msr, val, failed)
);
+DEFINE_EVENT(msr_trace_class, rdpmc,
+ TP_PROTO(unsigned msr, u64 val, int failed),
+ TP_ARGS(msr, val, failed)
+);
+
+
#endif /* _TRACE_MSR_H */
/* This part must be outside protection */
--
1.9.3
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists