diff options
| author | Chen, Kenneth W <kenneth.w.chen@intel.com> | 2006-12-10 02:20:36 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.osdl.org> | 2006-12-10 09:55:43 -0800 |
| commit | 62ab616d54371a65f595c199aad1e1755b837d25 (patch) | |
| tree | 5615868bc04901a48f28ecc3da7cc3de035a5662 /kernel/sched.c | |
| parent | 06066714f6016cffcb249f6ab21b7919de1bc859 (diff) | |
| download | lwn-62ab616d54371a65f595c199aad1e1755b837d25.tar.gz lwn-62ab616d54371a65f595c199aad1e1755b837d25.zip | |
[PATCH] sched: optimize activate_task for RT task
RT task does not participate in interactiveness priority and thus shouldn't
be bothered with timestamp and p->sleep_type manipulation when task is
being put on run queue. Bypass all of the them with a single if (rt_task)
test.
Signed-off-by: Ken Chen <kenneth.w.chen@intel.com>
Acked-by: Ingo Molnar <mingo@elte.hu>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: "Siddha, Suresh B" <suresh.b.siddha@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'kernel/sched.c')
| -rw-r--r-- | kernel/sched.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/kernel/sched.c b/kernel/sched.c index 66e44b5b53d2..48e35c916326 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -940,6 +940,9 @@ static void activate_task(struct task_struct *p, struct rq *rq, int local) { unsigned long long now; + if (rt_task(p)) + goto out; + now = sched_clock(); #ifdef CONFIG_SMP if (!local) { @@ -961,8 +964,7 @@ static void activate_task(struct task_struct *p, struct rq *rq, int local) (now - p->timestamp) >> 20); } - if (!rt_task(p)) - p->prio = recalc_task_prio(p, now); + p->prio = recalc_task_prio(p, now); /* * This checks to make sure it's not an uninterruptible task @@ -987,7 +989,7 @@ static void activate_task(struct task_struct *p, struct rq *rq, int local) } } p->timestamp = now; - +out: __activate_task(p, rq); } |