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Commit 3a0304e9 authored by Peter Zijlstra's avatar Peter Zijlstra Committed by Ingo Molnar
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perf_events: Report the MMAP pgoff value in bytes 



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: default avatarDavid Miller <davem@davemloft.net>
Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <new-submission>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 628ada0c

kernel/perf_event.c

+1 −1
Original line number Diff line number Diff line
@@ -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,

		},

	};