A-Team_Digital_Solutions/android_kernel_motorola_sm6375
Watch
2
0
Fork
You've already forked android_kernel_motorola_sm6375
 0
mirror of https://github.com/BobTheBlinker/android_kernel_motorola_sm6375.git synced 2026-10-28 10:41:38 -04:00
Code Issues Projects Releases Packages Wiki Activity

sched: optimize schedule() a bit on SMP

Browse source 
optimize schedule() a bit on SMP, by moving the rq-clock update
outside the rq lock.

code size is the same:

      text    data     bss     dec     hex filename
     25725    2666      96   28487    6f47 sched.o.before
     25725    2666      96   28487    6f47 sched.o.after

Signed-off-by: Ingo Molnar <[email protected]>
Reviewed-by: Thomas Gleixner <[email protected]>
This commit is contained in:
Ingo Molnar 2007-10-15 17:00:13 +02:00
commit 1e81995066
1 changed files with 6 additions and 2 deletions
Download patch file Download diff file Expand all files Collapse all files

8
kernel/sched.c
View file

@ -3481,9 +3481,13 @@ need_resched_nonpreemptible:
schedule_debug(prev);
spin_lock_irq(&rq->lock);
clear_tsk_need_resched(prev);
/*
* Do the rq-clock update outside the rq lock:
*/
local_irq_disable();
__update_rq_clock(rq);
spin_lock(&rq->lock);
clear_tsk_need_resched(prev);
if (prev->state && !(preempt_count() & PREEMPT_ACTIVE)) {
if (unlikely((prev->state & TASK_INTERRUPTIBLE) &&