Messages in this thread Patch in this message | | | Date | Tue, 15 Feb 2011 17:46:07 -0800 | From | Greg KH <> | Subject | [101/115] sched: Add a PF flag for ksoftirqd identification |
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2.6.32-longterm review patch. If anyone has any objections, please let us know.
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Commit: 6cdd5199daf0cb7b0fcc8dca941af08492612887 upstream
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 <venki@google.com> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> LKML-Reference: <1286237003-12406-4-git-send-email-venki@google.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Mike Galbraith <efault@gmx.de> Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de> --- include/linux/sched.h | 1 + kernel/softirq.c | 1 + 2 files changed, 2 insertions(+)
--- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -1728,6 +1728,7 @@ extern void thread_group_times(struct ta /* * 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 */ --- 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()) {
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