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Commit 6cdd5199 authored by Venkatesh Pallipadi's avatar Venkatesh Pallipadi Committed by Ingo Molnar
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sched: Add a PF flag for ksoftirqd identification 



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: default avatarVenkatesh Pallipadi <venki@google.com>
Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <1286237003-12406-4-git-send-email-venki@google.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent e1e10a26

include/linux/sched.h

+1 −0
Original line number Diff line number Diff line
@@ -1682,6 +1682,7 @@ 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 */

kernel/softirq.c

+1 −0
Original line number Diff line number Diff line
@@ -713,6 +713,7 @@ static int run_ksoftirqd(void * __bind_cpu) 
{

	set_current_state(TASK_INTERRUPTIBLE);



	current->flags |= PF_KSOFTIRQD;

	while (!kthread_should_stop()) {

		preempt_disable();

		if (!local_softirq_pending()) {