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Subject[PATCH] [100/275] sched: Add a PF flag for ksoftirqd identification
Date
2.6.35-longterm review patch.  If anyone has any objections, please let me know.

------------------
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>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
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(+)

Index: linux-2.6.35.y/include/linux/sched.h
===================================================================
--- linux-2.6.35.y.orig/include/linux/sched.h 2011-03-29 23:03:00.229294303 -0700
+++ linux-2.6.35.y/include/linux/sched.h 2011-03-29 23:55:00.771447437 -0700
@@ -1685,6 +1685,7 @@
/*
* 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 */
Index: linux-2.6.35.y/kernel/softirq.c
===================================================================
--- linux-2.6.35.y.orig/kernel/softirq.c 2011-03-29 23:03:00.152296274 -0700
+++ linux-2.6.35.y/kernel/softirq.c 2011-03-29 23:54:58.951494004 -0700
@@ -713,6 +713,7 @@
{
set_current_state(TASK_INTERRUPTIBLE);

+ current->flags |= PF_KSOFTIRQD;
while (!kthread_should_stop()) {
preempt_disable();
if (!local_softirq_pending()) {

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