The patch titled
Subject: timer: provide an api for deferrable timeout
has been added to the -mm tree. Its filename is
timer-provide-an-api-for-deferrable-timeout.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/timer-provide-an-api-for-deferrable-timeout.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/timer-provide-an-api-for-deferrable-timeout.patch
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------------------------------------------------------
From: Chintan Pandya <cpandya@xxxxxxxxxxxxxx>
Subject: timer: provide an api for deferrable timeout
schedule_timeout wakes up the CPU from IDLE state. For some use cases it
is not desirable, hence introduce a convenient API
(schedule_timeout_deferrable_interruptible) on similar pattern which uses
a deferrable timer.
Signed-off-by: Chintan Pandya <cpandya@xxxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: John Stultz <john.stultz@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/sched.h | 2 ++
kernel/time/timer.c | 27 ++++++++++++++++++++++++---
2 files changed, 26 insertions(+), 3 deletions(-)
diff -puN include/linux/sched.h~timer-provide-an-api-for-deferrable-timeout include/linux/sched.h
--- a/include/linux/sched.h~timer-provide-an-api-for-deferrable-timeout
+++ a/include/linux/sched.h
@@ -377,6 +377,8 @@ extern int in_sched_functions(unsigned l
#define MAX_SCHEDULE_TIMEOUT LONG_MAX
extern signed long schedule_timeout(signed long timeout);
extern signed long schedule_timeout_interruptible(signed long timeout);
+extern signed long
+schedule_timeout_deferrable_interruptible(signed long timeout);
extern signed long schedule_timeout_killable(signed long timeout);
extern signed long schedule_timeout_uninterruptible(signed long timeout);
asmlinkage void schedule(void);
diff -puN kernel/time/timer.c~timer-provide-an-api-for-deferrable-timeout kernel/time/timer.c
--- a/kernel/time/timer.c~timer-provide-an-api-for-deferrable-timeout
+++ a/kernel/time/timer.c
@@ -1432,7 +1432,7 @@ static void process_timeout(unsigned lon
}
/**
- * schedule_timeout - sleep until timeout
+ * __schedule_timeout - sleep until timeout
* @timeout: timeout value in jiffies
*
* Make the current task sleep until @timeout jiffies have
@@ -1457,7 +1457,8 @@ static void process_timeout(unsigned lon
*
* In all cases the return value is guaranteed to be non-negative.
*/
-signed long __sched schedule_timeout(signed long timeout)
+static signed long
+__sched __schedule_timeout(signed long timeout, unsigned long flag)
{
struct timer_list timer;
unsigned long expire;
@@ -1493,7 +1494,13 @@ signed long __sched schedule_timeout(sig
expire = timeout + jiffies;
- setup_timer_on_stack(&timer, process_timeout, (unsigned long)current);
+ if (flag & TIMER_DEFERRABLE)
+ setup_deferrable_timer_on_stack(&timer, process_timeout,
+ (unsigned long)current);
+ else
+ setup_timer_on_stack(&timer, process_timeout,
+ (unsigned long)current);
+
__mod_timer(&timer, expire, false, TIMER_NOT_PINNED);
schedule();
del_singleshot_timer_sync(&timer);
@@ -1506,12 +1513,26 @@ signed long __sched schedule_timeout(sig
out:
return timeout < 0 ? 0 : timeout;
}
+
+signed long __sched schedule_timeout(signed long timeout)
+{
+ return __schedule_timeout(timeout, 0);
+}
EXPORT_SYMBOL(schedule_timeout);
/*
* We can use __set_current_state() here because schedule_timeout() calls
* schedule() unconditionally.
*/
+
+signed long
+__sched schedule_timeout_deferrable_interruptible(signed long timeout)
+{
+ __set_current_state(TASK_INTERRUPTIBLE);
+ return __schedule_timeout(timeout, TIMER_DEFERRABLE);
+}
+EXPORT_SYMBOL(schedule_timeout_deferrable_interruptible);
+
signed long __sched schedule_timeout_interruptible(signed long timeout)
{
__set_current_state(TASK_INTERRUPTIBLE);
_
Patches currently in -mm which might be from cpandya@xxxxxxxxxxxxxx are
timer-provide-an-api-for-deferrable-timeout.patch
ksm-provide-support-to-use-deferrable-timers-for-scanner-thread.patch
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