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authorIngo Molnar <mingo@elte.hu>2006-01-12 01:05:27 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-01-12 09:08:49 -0800
commit4dc7a0bbeb6882ad665e588e82fabe5bb4645f2f (patch)
tree8c034f802157d7f449e76f45086c0e13e0ea4711 /include/asm-x86_64
parentc6b44d10f25e5a93eca5135b686a35775c63546e (diff)
downloadop-kernel-dev-4dc7a0bbeb6882ad665e588e82fabe5bb4645f2f.zip
op-kernel-dev-4dc7a0bbeb6882ad665e588e82fabe5bb4645f2f.tar.gz
[PATCH] sched: add cacheflush() asm
Add per-arch sched_cacheflush() which is a write-back cacheflush used by the migration-cost calibration code at bootup time. Signed-off-by: Ingo Molnar <mingo@elte.hu> Cc: Nick Piggin <nickpiggin@yahoo.com.au> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/asm-x86_64')
-rw-r--r--include/asm-x86_64/system.h9
1 files changed, 9 insertions, 0 deletions
diff --git a/include/asm-x86_64/system.h b/include/asm-x86_64/system.h
index 38c1e8a..0eacbef 100644
--- a/include/asm-x86_64/system.h
+++ b/include/asm-x86_64/system.h
@@ -193,6 +193,15 @@ static inline void write_cr4(unsigned long val)
#define wbinvd() \
__asm__ __volatile__ ("wbinvd": : :"memory");
+/*
+ * On SMP systems, when the scheduler does migration-cost autodetection,
+ * it needs a way to flush as much of the CPU's caches as possible.
+ */
+static inline void sched_cacheflush(void)
+{
+ wbinvd();
+}
+
#endif /* __KERNEL__ */
#define nop() __asm__ __volatile__ ("nop")
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