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Date: Thu, 31 Mar 2016 02:26:29 -0700
From: tip-bot for Wang Nan <tipbot@...or.com>
To: linux-tip-commits@...r.kernel.org
Cc: peterz@...radead.org, wangnan0@...wei.com, mingo@...nel.org,
hekuang@...wei.com, jolsa@...hat.com,
alexander.shishkin@...ux.intel.com, tglx@...utronix.de,
masami.hiramatsu.pt@...achi.com, hpa@...or.com,
namhyung@...nel.org, brendan.d.gregg@...il.com, jolsa@...nel.org,
ast@...nel.org, pi3orama@....com, acme@...hat.com,
linux-kernel@...r.kernel.org, lizefan@...wei.com,
torvalds@...ux-foundation.org, vincent.weaver@...ne.edu,
eranian@...gle.com
Subject: [tip:perf/core] perf/core: Set event's default ::overflow_handler()
Commit-ID: 1879445dfa7bbd6fe21b09c5cc72f4934798afed
Gitweb: http://git.kernel.org/tip/1879445dfa7bbd6fe21b09c5cc72f4934798afed
Author: Wang Nan <wangnan0@...wei.com>
AuthorDate: Mon, 28 Mar 2016 06:41:30 +0000
Committer: Ingo Molnar <mingo@...nel.org>
CommitDate: Thu, 31 Mar 2016 10:30:47 +0200
perf/core: Set event's default ::overflow_handler()
Set a default event->overflow_handler in perf_event_alloc() so don't
need to check event->overflow_handler in __perf_event_overflow().
Following commits can give a different default overflow_handler.
Initial idea comes from Peter:
http://lkml.kernel.org/r/20130708121557.GA17211@twins.programming.kicks-ass.net
Since the default value of event->overflow_handler is not NULL, existing
'if (!overflow_handler)' checks need to be changed.
is_default_overflow_handler() is introduced for this.
No extra performance overhead is introduced into the hot path because in the
original code we still need to read this handler from memory. A conditional
branch is avoided so actually we remove some instructions.
Signed-off-by: Wang Nan <wangnan0@...wei.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Cc: <pi3orama@....com>
Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc: Alexei Starovoitov <ast@...nel.org>
Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: Brendan Gregg <brendan.d.gregg@...il.com>
Cc: He Kuang <hekuang@...wei.com>
Cc: Jiri Olsa <jolsa@...nel.org>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Stephane Eranian <eranian@...gle.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Vince Weaver <vincent.weaver@...ne.edu>
Cc: Zefan Li <lizefan@...wei.com>
Link: http://lkml.kernel.org/r/1459147292-239310-3-git-send-email-wangnan0@huawei.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
arch/arm/kernel/hw_breakpoint.c | 4 ++--
arch/arm64/kernel/hw_breakpoint.c | 4 ++--
include/linux/perf_event.h | 6 ++++++
kernel/events/core.c | 14 ++++++++------
4 files changed, 18 insertions(+), 10 deletions(-)
diff --git a/arch/arm/kernel/hw_breakpoint.c b/arch/arm/kernel/hw_breakpoint.c
index 6284779..b8df458 100644
--- a/arch/arm/kernel/hw_breakpoint.c
+++ b/arch/arm/kernel/hw_breakpoint.c
@@ -631,7 +631,7 @@ int arch_validate_hwbkpt_settings(struct perf_event *bp)
info->address &= ~alignment_mask;
info->ctrl.len <<= offset;
- if (!bp->overflow_handler) {
+ if (is_default_overflow_handler(bp)) {
/*
* Mismatch breakpoints are required for single-stepping
* breakpoints.
@@ -754,7 +754,7 @@ static void watchpoint_handler(unsigned long addr, unsigned int fsr,
* mismatch breakpoint so we can single-step over the
* watchpoint trigger.
*/
- if (!wp->overflow_handler)
+ if (is_default_overflow_handler(wp))
enable_single_step(wp, instruction_pointer(regs));
unlock:
diff --git a/arch/arm64/kernel/hw_breakpoint.c b/arch/arm64/kernel/hw_breakpoint.c
index b45c95d..4ef5373 100644
--- a/arch/arm64/kernel/hw_breakpoint.c
+++ b/arch/arm64/kernel/hw_breakpoint.c
@@ -616,7 +616,7 @@ static int breakpoint_handler(unsigned long unused, unsigned int esr,
perf_bp_event(bp, regs);
/* Do we need to handle the stepping? */
- if (!bp->overflow_handler)
+ if (is_default_overflow_handler(bp))
step = 1;
unlock:
rcu_read_unlock();
@@ -712,7 +712,7 @@ static int watchpoint_handler(unsigned long addr, unsigned int esr,
perf_bp_event(wp, regs);
/* Do we need to handle the stepping? */
- if (!wp->overflow_handler)
+ if (is_default_overflow_handler(wp))
step = 1;
unlock:
diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index 15588d4..4065ca2 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -838,6 +838,12 @@ extern void perf_event_output(struct perf_event *event,
struct perf_sample_data *data,
struct pt_regs *regs);
+static inline bool
+is_default_overflow_handler(struct perf_event *event)
+{
+ return (event->overflow_handler == perf_event_output);
+}
+
extern void
perf_event_header__init_id(struct perf_event_header *header,
struct perf_sample_data *data,
diff --git a/kernel/events/core.c b/kernel/events/core.c
index 51386e8..8c3b35f 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -6628,10 +6628,7 @@ static int __perf_event_overflow(struct perf_event *event,
irq_work_queue(&event->pending);
}
- if (event->overflow_handler)
- event->overflow_handler(event, data, regs);
- else
- perf_event_output(event, data, regs);
+ event->overflow_handler(event, data, regs);
if (*perf_event_fasync(event) && event->pending_kill) {
event->pending_wakeup = 1;
@@ -8152,8 +8149,13 @@ perf_event_alloc(struct perf_event_attr *attr, int cpu,
context = parent_event->overflow_handler_context;
}
- event->overflow_handler = overflow_handler;
- event->overflow_handler_context = context;
+ if (overflow_handler) {
+ event->overflow_handler = overflow_handler;
+ event->overflow_handler_context = context;
+ } else {
+ event->overflow_handler = perf_event_output;
+ event->overflow_handler_context = NULL;
+ }
perf_event__state_init(event);
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