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authorKen Chen <kenchen@google.com>2007-10-18 21:32:56 +0200
committerIngo Molnar <mingo@elte.hu>2007-10-18 21:32:56 +0200
commit480b9434c542ddf2833aaed3dabba71bc0b787b5 (patch)
tree78c2638ac583cc57165ee1393ebbbbbe367f46fb /kernel/sched.c
parentcc4ea79588e688ea9b1161650979a194dd709169 (diff)
sched: reduce schedstat variable overhead a bit
schedstat is useful in investigating CPU scheduler behavior. Ideally, I think it is beneficial to have it on all the time. However, the cost of turning it on in production system is quite high, largely due to number of events it collects and also due to its large memory footprint. Most of the fields probably don't need to be full 64-bit on 64-bit arch. Rolling over 4 billion events will most like take a long time and user space tool can be made to accommodate that. I'm proposing kernel to cut back most of variable width on 64-bit system. (note, the following patch doesn't affect 32-bit system). Signed-off-by: Ken Chen <kenchen@google.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/sched.c')
-rw-r--r--kernel/sched.c20
1 files changed, 10 insertions, 10 deletions
diff --git a/kernel/sched.c b/kernel/sched.c
index b19cc5b79e2..b60f8a5ae2b 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -332,22 +332,22 @@ struct rq {
struct sched_info rq_sched_info;
/* sys_sched_yield() stats */
- unsigned long yld_exp_empty;
- unsigned long yld_act_empty;
- unsigned long yld_both_empty;
- unsigned long yld_count;
+ unsigned int yld_exp_empty;
+ unsigned int yld_act_empty;
+ unsigned int yld_both_empty;
+ unsigned int yld_count;
/* schedule() stats */
- unsigned long sched_switch;
- unsigned long sched_count;
- unsigned long sched_goidle;
+ unsigned int sched_switch;
+ unsigned int sched_count;
+ unsigned int sched_goidle;
/* try_to_wake_up() stats */
- unsigned long ttwu_count;
- unsigned long ttwu_local;
+ unsigned int ttwu_count;
+ unsigned int ttwu_local;
/* BKL stats */
- unsigned long bkl_count;
+ unsigned int bkl_count;
#endif
struct lock_class_key rq_lock_key;
};