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perf_events: Report the MMAP pgoff value in bytes

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DaveM reported that currently perf interprets the pgoff value reported by
the MMAP events as a byte range, but the kernel reports it as a page
offset.

Since its broken (and unusable) anyway, change the kernel behaviour (ABI)
to report bytes indeed, avoiding the need for userspace to deal with
PAGE_SIZE things.

Reported-by: David Miller <davem@davemloft.net>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra 2010-02-26 10:33:41 +01:00 committed by Ingo Molnar
parent 628ada0cb0
commit 3a0304e90a
1 changed files with 1 additions and 1 deletions
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2
kernel/perf_event.c
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@ -3749,7 +3749,7 @@ void __perf_event_mmap(struct vm_area_struct *vma)
/* .tid */
.start = vma->vm_start,
.len = vma->vm_end - vma->vm_start,
.pgoff = vma->vm_pgoff,
.pgoff = (u64)vma->vm_pgoff << PAGE_SHIFT,
},
};