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Date: Fri, 13 Mar 2009 13:01:34 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 pagefault software events
Commit-ID: cfd5e4ffd21a8a46cb6e25f14981c3a53601bbe5
Gitweb: http://git.kernel.org/tip/cfd5e4ffd21a8a46cb6e25f14981c3a53601bbe5
Author: Peter Zijlstra <a.p.zijlstra@...llo.nl>
AuthorDate: Fri, 13 Mar 2009 12:21:33 +0100
Commit: Ingo Molnar <mingo@...e.hu>
CommitDate: Fri, 13 Mar 2009 13:59:10 +0100
perf_counter: provide pagefault software events
We use the generic software counter infrastructure to provide
page fault events.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
LKML-Reference: <20090313112301.668614497@...llo.nl>
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
arch/powerpc/mm/fault.c | 3 ++
arch/x86/mm/fault.c | 3 ++
kernel/perf_counter.c | 53 ++--------------------------------------------
3 files changed, 9 insertions(+), 50 deletions(-)
diff --git a/arch/powerpc/mm/fault.c b/arch/powerpc/mm/fault.c
index 91c7b86..b044dc7 100644
--- a/arch/powerpc/mm/fault.c
+++ b/arch/powerpc/mm/fault.c
@@ -29,6 +29,7 @@
#include <linux/module.h>
#include <linux/kprobes.h>
#include <linux/kdebug.h>
+#include <linux/perf_counter.h>
#include <asm/firmware.h>
#include <asm/page.h>
@@ -170,6 +171,8 @@ int __kprobes do_page_fault(struct pt_regs *regs, unsigned long address,
die("Weird page fault", regs, SIGSEGV);
}
+ perf_swcounter_event(PERF_COUNT_PAGE_FAULTS, 1, 0, regs);
+
/* When running in the kernel we expect faults to occur only to
* addresses in user space. All other faults represent errors in the
* kernel and should generate an OOPS. Unfortunately, in the case of an
diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c
index a03b727..c872575 100644
--- a/arch/x86/mm/fault.c
+++ b/arch/x86/mm/fault.c
@@ -27,6 +27,7 @@
#include <linux/tty.h>
#include <linux/smp.h>
#include <linux/mm.h>
+#include <linux/perf_counter.h>
#include <asm-generic/sections.h>
@@ -1044,6 +1045,8 @@ do_page_fault(struct pt_regs *regs, unsigned long error_code)
if (unlikely(error_code & PF_RSVD))
pgtable_bad(regs, error_code, address);
+ perf_swcounter_event(PERF_COUNT_PAGE_FAULTS, 1, 0, regs);
+
/*
* If we're in an interrupt, have no user context or are running
* in an atomic region then we must not take the fault:
diff --git a/kernel/perf_counter.c b/kernel/perf_counter.c
index eeb1b46..1773c5d 100644
--- a/kernel/perf_counter.c
+++ b/kernel/perf_counter.c
@@ -1607,57 +1607,10 @@ static const struct hw_perf_counter_ops perf_ops_task_clock = {
* Software counter: page faults
*/
-#ifdef CONFIG_VM_EVENT_COUNTERS
-#define cpu_page_faults() __get_cpu_var(vm_event_states).event[PGFAULT]
-#else
-#define cpu_page_faults() 0
-#endif
-
-static u64 get_page_faults(struct perf_counter *counter)
-{
- struct task_struct *curr = counter->ctx->task;
-
- if (curr)
- return curr->maj_flt + curr->min_flt;
- return cpu_page_faults();
-}
-
-static void page_faults_perf_counter_update(struct perf_counter *counter)
-{
- u64 prev, now;
- s64 delta;
-
- prev = atomic64_read(&counter->hw.prev_count);
- now = get_page_faults(counter);
-
- atomic64_set(&counter->hw.prev_count, now);
-
- delta = now - prev;
-
- atomic64_add(delta, &counter->count);
-}
-
-static void page_faults_perf_counter_read(struct perf_counter *counter)
-{
- page_faults_perf_counter_update(counter);
-}
-
-static int page_faults_perf_counter_enable(struct perf_counter *counter)
-{
- if (counter->prev_state <= PERF_COUNTER_STATE_OFF)
- atomic64_set(&counter->hw.prev_count, get_page_faults(counter));
- return 0;
-}
-
-static void page_faults_perf_counter_disable(struct perf_counter *counter)
-{
- page_faults_perf_counter_update(counter);
-}
-
static const struct hw_perf_counter_ops perf_ops_page_faults = {
- .enable = page_faults_perf_counter_enable,
- .disable = page_faults_perf_counter_disable,
- .read = page_faults_perf_counter_read,
+ .enable = perf_swcounter_enable,
+ .disable = perf_swcounter_disable,
+ .read = perf_swcounter_read,
};
/*
--
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