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authorIngo Molnar <mingo@elte.hu>2005-06-25 17:57:39 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-06-25 19:24:45 -0400
commitf8cbd99bd3a023db8d6356d19a5f6f539d367327 (patch)
treef7472cc26a2a1dad631c35a4eb6d0c10cf8cd66e /include
parentf704f56af95bec3c1ca719d64d0becef74d40899 (diff)
[PATCH] sched: voluntary kernel preemption
This patch adds a new preemption model: 'Voluntary Kernel Preemption'. The 3 models can be selected from a new menu: (X) No Forced Preemption (Server) ( ) Voluntary Kernel Preemption (Desktop) ( ) Preemptible Kernel (Low-Latency Desktop) we still default to the stock (Server) preemption model. Voluntary preemption works by adding a cond_resched() (reschedule-if-needed) call to every might_sleep() check. It is lighter than CONFIG_PREEMPT - at the cost of not having as tight latencies. It represents a different latency/complexity/overhead tradeoff. It has no runtime impact at all if disabled. Here are size stats that show how the various preemption models impact the kernel's size: text data bss dec hex filename 3618774 547184 179896 4345854 424ffe vmlinux.stock 3626406 547184 179896 4353486 426dce vmlinux.voluntary +0.2% 3748414 548640 179896 4476950 445016 vmlinux.preempt +3.5% voluntary-preempt is +0.2% of .text, preempt is +3.5%. This feature has been tested for many months by lots of people (and it's also included in the RHEL4 distribution and earlier variants were in Fedora as well), and it's intended for users and distributions who dont want to use full-blown CONFIG_PREEMPT for one reason or another. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/kernel.h18
1 files changed, 13 insertions, 5 deletions
diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index e25b97062ce1..687ba8c9973d 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -58,15 +58,23 @@ struct completion;
58 * be biten later when the calling function happens to sleep when it is not 58 * be biten later when the calling function happens to sleep when it is not
59 * supposed to. 59 * supposed to.
60 */ 60 */
61#ifdef CONFIG_PREEMPT_VOLUNTARY
62extern int cond_resched(void);
63# define might_resched() cond_resched()
64#else
65# define might_resched() do { } while (0)
66#endif
67
61#ifdef CONFIG_DEBUG_SPINLOCK_SLEEP 68#ifdef CONFIG_DEBUG_SPINLOCK_SLEEP
62#define might_sleep() __might_sleep(__FILE__, __LINE__) 69 void __might_sleep(char *file, int line);
63#define might_sleep_if(cond) do { if (unlikely(cond)) might_sleep(); } while (0) 70# define might_sleep() \
64void __might_sleep(char *file, int line); 71 do { __might_sleep(__FILE__, __LINE__); might_resched(); } while (0)
65#else 72#else
66#define might_sleep() do {} while(0) 73# define might_sleep() do { might_resched(); } while (0)
67#define might_sleep_if(cond) do {} while (0)
68#endif 74#endif
69 75
76#define might_sleep_if(cond) do { if (unlikely(cond)) might_sleep(); } while (0)
77
70#define abs(x) ({ \ 78#define abs(x) ({ \
71 int __x = (x); \ 79 int __x = (x); \
72 (__x < 0) ? -__x : __x; \ 80 (__x < 0) ? -__x : __x; \