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authorPeter Zijlstra <a.p.zijlstra@chello.nl>2009-09-21 16:08:49 +0200
committerIngo Molnar <mingo@elte.hu>2009-10-06 14:21:50 +0200
commit906010b2134e14a2e377decbadd357b3d0ab9c6a (patch)
tree598b30d08f5ca8df1e00abc295b120fa1bd2c2e2 /init/Kconfig
parente13dbd7d75d1ecc315c6e3071b3c4e8fba4f6bec (diff)
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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/Kconfig')
-rw-r--r--init/Kconfig18
1 files changed, 18 insertions, 0 deletions
diff --git a/init/Kconfig b/init/Kconfig
index c7bac39d6c6..09c5c6431f4 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