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perf_counter: provide pagefault software events

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We use the generic software counter infrastructure to provide
page fault events.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra
2009-03-13 12:21:33 +01:00
committed by Ingo Molnar
parent 15dbf27cc1
commit 7dd1fcc258
3 changed files with 9 additions and 50 deletions
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3
arch/x86/mm/fault.c
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@@ -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: