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Date: Fri, 13 Mar 2009 13:01:43 GMT
From: Peter Zijlstra <a.p.zijlstra@...llo.nl>
To: linux-tip-commits@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
a.p.zijlstra@...llo.nl, tglx@...utronix.de, mingo@...e.hu
Subject: [tip:perfcounters/core] perf_counter: provide major/minor page fault software events
Commit-ID: abeecd0d151291c8056461d8dca7cccaf9a14dcd
Gitweb: http://git.kernel.org/tip/abeecd0d151291c8056461d8dca7cccaf9a14dcd
Author: Peter Zijlstra <a.p.zijlstra@...llo.nl>
AuthorDate: Fri, 13 Mar 2009 12:21:34 +0100
Commit: Ingo Molnar <mingo@...e.hu>
CommitDate: Fri, 13 Mar 2009 13:59:11 +0100
perf_counter: provide major/minor page fault software events
Provide separate sw counters for major and minor page faults.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
LKML-Reference: <20090313112301.770243471@...llo.nl>
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
arch/powerpc/mm/fault.c | 5 ++++-
arch/x86/mm/fault.c | 7 +++++--
include/linux/perf_counter.h | 4 +++-
kernel/perf_counter.c | 22 +++++++++-------------
4 files changed, 21 insertions(+), 17 deletions(-)
diff --git a/arch/powerpc/mm/fault.c b/arch/powerpc/mm/fault.c
index b044dc7..de37a3a 100644
--- a/arch/powerpc/mm/fault.c
+++ b/arch/powerpc/mm/fault.c
@@ -324,6 +324,7 @@ good_area:
}
if (ret & VM_FAULT_MAJOR) {
current->maj_flt++;
+ perf_swcounter_event(PERF_COUNT_PAGE_FAULTS_MAJ, 1, 0, regs);
#ifdef CONFIG_PPC_SMLPAR
if (firmware_has_feature(FW_FEATURE_CMO)) {
preempt_disable();
@@ -331,8 +332,10 @@ good_area:
preempt_enable();
}
#endif
- } else
+ } else {
current->min_flt++;
+ perf_swcounter_event(PERF_COUNT_PAGE_FAULTS_MIN, 1, 0, regs);
+ }
up_read(&mm->mmap_sem);
return 0;
diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c
index c872575..f2d3324 100644
--- a/arch/x86/mm/fault.c
+++ b/arch/x86/mm/fault.c
@@ -1140,10 +1140,13 @@ good_area:
return;
}
- if (fault & VM_FAULT_MAJOR)
+ if (fault & VM_FAULT_MAJOR) {
tsk->maj_flt++;
- else
+ perf_swcounter_event(PERF_COUNT_PAGE_FAULTS_MAJ, 1, 0, regs);
+ } else {
tsk->min_flt++;
+ perf_swcounter_event(PERF_COUNT_PAGE_FAULTS_MIN, 1, 0, regs);
+ }
check_v8086_mode(regs, address, tsk);
diff --git a/include/linux/perf_counter.h b/include/linux/perf_counter.h
index c910074..61e26cc 100644
--- a/include/linux/perf_counter.h
+++ b/include/linux/perf_counter.h
@@ -49,8 +49,10 @@ enum hw_event_types {
PERF_COUNT_PAGE_FAULTS = -3,
PERF_COUNT_CONTEXT_SWITCHES = -4,
PERF_COUNT_CPU_MIGRATIONS = -5,
+ PERF_COUNT_PAGE_FAULTS_MIN = -6,
+ PERF_COUNT_PAGE_FAULTS_MAJ = -7,
- PERF_SW_EVENTS_MIN = -6,
+ PERF_SW_EVENTS_MIN = -8,
};
/*
diff --git a/kernel/perf_counter.c b/kernel/perf_counter.c
index 1773c5d..68950a3 100644
--- a/kernel/perf_counter.c
+++ b/kernel/perf_counter.c
@@ -1503,6 +1503,12 @@ static void perf_swcounter_disable(struct perf_counter *counter)
perf_swcounter_update(counter);
}
+static const struct hw_perf_counter_ops perf_ops_generic = {
+ .enable = perf_swcounter_enable,
+ .disable = perf_swcounter_disable,
+ .read = perf_swcounter_read,
+};
+
/*
* Software counter: cpu wall time clock
*/
@@ -1604,16 +1610,6 @@ static const struct hw_perf_counter_ops perf_ops_task_clock = {
};
/*
- * Software counter: page faults
- */
-
-static const struct hw_perf_counter_ops perf_ops_page_faults = {
- .enable = perf_swcounter_enable,
- .disable = perf_swcounter_disable,
- .read = perf_swcounter_read,
-};
-
-/*
* Software counter: context switches
*/
@@ -1753,9 +1749,9 @@ sw_perf_counter_init(struct perf_counter *counter)
hw_ops = &perf_ops_cpu_clock;
break;
case PERF_COUNT_PAGE_FAULTS:
- if (!(counter->hw_event.exclude_user ||
- counter->hw_event.exclude_kernel))
- hw_ops = &perf_ops_page_faults;
+ case PERF_COUNT_PAGE_FAULTS_MIN:
+ case PERF_COUNT_PAGE_FAULTS_MAJ:
+ hw_ops = &perf_ops_generic;
break;
case PERF_COUNT_CONTEXT_SWITCHES:
if (!counter->hw_event.exclude_kernel)
--
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