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perf_counter: allow for data addresses to be recorded

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Paul suggested we allow for data addresses to be recorded along with
the traditional IPs as power can provide these.

For now, only the software pagefault events provide data addresses,
but in the future power might as well for some events.

x86 doesn't seem capable of providing this atm.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
LKML-Reference: <20090408130409.394816925@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra 2009-04-08 15:01:33 +02:00 • committed by Ingo Molnar
parent 4d855457d8
commit 78f13e9525
6 changed files with 49 additions and 31 deletions
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8
arch/x86/mm/fault.c
View file

@ -1045,7 +1045,7 @@ 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);
perf_swcounter_event(PERF_COUNT_PAGE_FAULTS, 1, 0, regs, address);
/*
* If we're in an interrupt, have no user context or are running
@ -1142,10 +1142,12 @@ good_area:
if (fault & VM_FAULT_MAJOR) {
tsk->maj_flt++;
perf_swcounter_event(PERF_COUNT_PAGE_FAULTS_MAJ, 1, 0, regs);
perf_swcounter_event(PERF_COUNT_PAGE_FAULTS_MAJ, 1, 0,
regs, address);
} else {
tsk->min_flt++;
perf_swcounter_event(PERF_COUNT_PAGE_FAULTS_MIN, 1, 0, regs);
perf_swcounter_event(PERF_COUNT_PAGE_FAULTS_MIN, 1, 0,
regs, address);
}
check_v8086_mode(regs, address, tsk);