diff options
author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2009-09-21 10:08:49 -0400 |
---|---|---|
committer | Ingo Molnar <mingo@elte.hu> | 2009-10-06 08:21:50 -0400 |
commit | 906010b2134e14a2e377decbadd357b3d0ab9c6a (patch) | |
tree | 598b30d08f5ca8df1e00abc295b120fa1bd2c2e2 /init | |
parent | e13dbd7d75d1ecc315c6e3071b3c4e8fba4f6bec (diff) |
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 | |||
921 | help | 921 | help |
922 | See tools/perf/design.txt for details. | 922 | See tools/perf/design.txt for details. |
923 | 923 | ||
924 | config PERF_USE_VMALLOC | ||
925 | bool | ||
926 | help | ||
927 | See tools/perf/design.txt for details | ||
928 | |||
924 | menu "Kernel Performance Events And Counters" | 929 | menu "Kernel Performance Events And Counters" |
925 | 930 | ||
926 | config PERF_EVENTS | 931 | config PERF_EVENTS |
@@ -976,6 +981,19 @@ config PERF_COUNTERS | |||
976 | 981 | ||
977 | Say N if unsure. | 982 | Say N if unsure. |
978 | 983 | ||
984 | config DEBUG_PERF_USE_VMALLOC | ||
985 | default n | ||
986 | bool "Debug: use vmalloc to back perf mmap() buffers" | ||
987 | depends on PERF_EVENTS && DEBUG_KERNEL | ||
988 | select PERF_USE_VMALLOC | ||
989 | help | ||
990 | Use vmalloc memory to back perf mmap() buffers. | ||
991 | |||
992 | Mostly useful for debugging the vmalloc code on platforms | ||
993 | that don't require it. | ||
994 | |||
995 | Say N if unsure. | ||
996 | |||
979 | endmenu | 997 | endmenu |
980 | 998 | ||
981 | config VM_EVENT_COUNTERS | 999 | config VM_EVENT_COUNTERS |