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| author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2009-09-21 16:08:49 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-10-06 14:21:50 +0200 |
| commit | 906010b2134e14a2e377decbadd357b3d0ab9c6a (patch) | |
| tree | 598b30d08f5ca8df1e00abc295b120fa1bd2c2e2 /init | |
| parent | e13dbd7d75d1ecc315c6e3071b3c4e8fba4f6bec (diff) | |
| download | lwn-906010b2134e14a2e377decbadd357b3d0ab9c6a.tar.gz lwn-906010b2134e14a2e377decbadd357b3d0ab9c6a.zip | |
perf_event: Provide vmalloc() based mmap() backing
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>
Diffstat (limited to 'init')
| -rw-r--r-- | init/Kconfig | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/init/Kconfig b/init/Kconfig index c7bac39d6c61..09c5c6431f42 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -921,6 +921,11 @@ config HAVE_PERF_EVENTS help See tools/perf/design.txt for details. +config PERF_USE_VMALLOC + bool + help + See tools/perf/design.txt for details + menu "Kernel Performance Events And Counters" config PERF_EVENTS @@ -976,6 +981,19 @@ config PERF_COUNTERS Say N if unsure. +config DEBUG_PERF_USE_VMALLOC + default n + bool "Debug: use vmalloc to back perf mmap() buffers" + depends on PERF_EVENTS && DEBUG_KERNEL + select PERF_USE_VMALLOC + help + Use vmalloc memory to back perf mmap() buffers. + + Mostly useful for debugging the vmalloc code on platforms + that don't require it. + + Say N if unsure. + endmenu config VM_EVENT_COUNTERS |