perf_event: Provide vmalloc() based mmap() backing

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Some architectures such as Sparc, ARM and MIPS (basically
everything with flush_dcache_page()) need to deal with dcache
aliases by carefully placing pages in both kernel and user maps.

These architectures typically have to use vmalloc_user() for this.

However, on other architectures, vmalloc() is not needed and has
the downsides of being more restricted and slower than regular
allocations.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Acked-by: David Miller <davem@davemloft.net>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Jens Axboe <jens.axboe@oracle.com>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <1254830228.21044.272.camel@laptop>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

...

This commit is contained in:

Peter Zijlstra 2009-09-21 16:08:49 +02:00 • committed by Ingo Molnar

parent e13dbd7d75

commit 906010b213

5 changed files with 214 additions and 62 deletions

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2

arch/sparc/Kconfig

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5

include/linux/perf_event.h

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18

init/Kconfig

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258

kernel/perf_event.c

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3

tools/perf/design.txt

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