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hrtimer: update timer->state with 'pinned' information

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'Pinned' information would be required in migrate_hrtimers() now, as we can
migrate non-pinned timers away without a hotplug (i.e. with cpuset.quiesce). And
so we may need to identify pinned timers now, as we can't migrate them.

This patch reuses the timer->state variable for setting this flag as there were
enough number of free bits available in this variable. And there is no point
increasing size of this struct by adding another field.

Change-Id: Id2cdd74903598e31fab6999c4cbab9c2fd17fe23
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
[forward port to 3.18]
Signed-off-by: Santosh Shukla <santosh.shukla@linaro.org>
[ohaugan@codeaurora.org: Port to 4.4]
Git-commit: 62feaf1ed0b64c04868d143d8bdb92d60dc3189b
Git-repo: git://git.linaro.org/people/mike.holmes/santosh.shukla/lng-isol.git
Signed-off-by: Olav Haugan <ohaugan@codeaurora.org>
[markivx: Port to 4.14, fix merge conflicts due to lack of timer stats code]
Signed-off-by: Vikram Mulukutla <markivx@codeaurora.org>
[satyap@codeaurora.org: Port to 4.19, fix merge conflicts]
Signed-off-by: Satya Durga Srinivasu Prabhala <satyap@codeaurora.org>
This commit is contained in:
Viresh Kumar 2015-03-25 11:57:45 +05:30 • committed by Satya Durga Srinivasu Prabhala
commit e2e45baa03
2 changed files with 17 additions and 5 deletions
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19
kernel/time/hrtimer.c
View file

@ -966,7 +966,7 @@ static int enqueue_hrtimer(struct hrtimer *timer,
base->cpu_base->active_bases |= 1 << base->index;
timer->state = HRTIMER_STATE_ENQUEUED;
timer->state |= HRTIMER_STATE_ENQUEUED;
return timerqueue_add(&base->active, &timer->node);
}
@ -986,11 +986,9 @@ static void __remove_hrtimer(struct hrtimer *timer,
u8 newstate, int reprogram)
{
struct hrtimer_cpu_base *cpu_base = base->cpu_base;
u8 state = timer->state;
timer->state = newstate;
if (!(state & HRTIMER_STATE_ENQUEUED))
return;
if (!(timer->state & HRTIMER_STATE_ENQUEUED))
goto out;
if (!timerqueue_del(&base->active, &timer->node))
cpu_base->active_bases &= ~(1 << base->index);
@ -1005,6 +1003,13 @@ static void __remove_hrtimer(struct hrtimer *timer,
*/
if (reprogram && timer == cpu_base->next_timer)
hrtimer_force_reprogram(cpu_base, 1);
out:
/*
* We need to preserve PINNED state here, otherwise we may end up
* migrating pinned hrtimers as well.
*/
timer->state = newstate | (timer->state & HRTIMER_STATE_PINNED);
}
/*
@ -1097,6 +1102,10 @@ static int __hrtimer_start_range_ns(struct hrtimer *timer, ktime_t tim,
/* Switch the timer base, if necessary: */
new_base = switch_hrtimer_base(timer, base, mode & HRTIMER_MODE_PINNED);
/* Update pinned state */
timer->state &= ~HRTIMER_STATE_PINNED;
timer->state |= !!(mode & HRTIMER_MODE_PINNED) << HRTIMER_PINNED_SHIFT;
return enqueue_hrtimer(timer, new_base, mode);
}