Commit: 6cdd5199daf0cb7b0fcc8dca941af08492612887 upstream Author: Venkatesh Pallipadi <[email protected]> AuthorDate: Mon Oct 4 17:03:18 2010 -0700
To account softirq time cleanly in scheduler, we need to identify whether softirq is invoked in ksoftirqd context or softirq at hardirq tail context. Add PF_KSOFTIRQD for that purpose. As all PF flag bits are currently taken, create space by moving one of the infrequently used bits (PF_THREAD_BOUND) down in task_struct to be along with some other state fields. Signed-off-by: Venkatesh Pallipadi <[email protected]> Signed-off-by: Peter Zijlstra <[email protected]> LKML-Reference: <[email protected]> Signed-off-by: Ingo Molnar <[email protected]> Signed-off-by: Mike Galbraith <[email protected]> Acked-by: Peter Zijlstra <[email protected]> --- include/linux/sched.h | 1 + kernel/softirq.c | 1 + 2 files changed, 2 insertions(+), 0 deletions(-) diff --git a/include/linux/sched.h b/include/linux/sched.h index 32bf471..63d5aea 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -1728,6 +1728,7 @@ extern void thread_group_times(struct task_struct *p, cputime_t *ut, cputime_t * /* * Per process flags */ +#define PF_KSOFTIRQD 0x00000001 /* I am ksoftirqd */ #define PF_STARTING 0x00000002 /* being created */ #define PF_EXITING 0x00000004 /* getting shut down */ #define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */ diff --git a/kernel/softirq.c b/kernel/softirq.c index 0ed8343..0a617de 100644 --- a/kernel/softirq.c +++ b/kernel/softirq.c @@ -718,6 +718,7 @@ static int ksoftirqd(void * __bind_cpu) { set_current_state(TASK_INTERRUPTIBLE); + current->flags |= PF_KSOFTIRQD; while (!kthread_should_stop()) { preempt_disable(); if (!local_softirq_pending()) { -- 1.7.4 _______________________________________________ stable mailing list [email protected] http://linux.kernel.org/mailman/listinfo/stable
