lkml.org 
[lkml]   [2003]   [Dec]   [20]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
SubjectRe: [PATCH 1/5] 2.6.0 fix preempt ctx switch accounting
* Nick Piggin <piggin@cyberone.com.au> wrote:

> Make sure to count kernel preemption as a context switch. A short cut
> has been preventing it.

i'd prefer the much simpler patch below. This also keeps the kernel
preemption logic isolated instead of mixing it into the normal path.

Ingo

--- linux/kernel/sched.c.orig
+++ linux/kernel/sched.c
@@ -1520,8 +1520,10 @@ need_resched:
* if entering off of a kernel preemption go straight
* to picking the next task.
*/
- if (unlikely(preempt_count() & PREEMPT_ACTIVE))
+ if (unlikely(preempt_count() & PREEMPT_ACTIVE)) {
+ prev->nivcsw++;
goto pick_next_task;
+ }

switch (prev->state) {
case TASK_INTERRUPTIBLE:
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
\
 
 \ /
  Last update: 2005-03-22 13:59    [W:0.467 / U:0.040 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site