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select: use freezable blocking call

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Avoid waking up every thread sleeping in a select call during
suspend and resume by calling a freezable blocking call.  Previous
patches modified the freezer to avoid sending wakeups to threads
that are blocked in freezable blocking calls.

This call was selected to be converted to a freezable call because
it doesn't hold any locks or release any resources when interrupted
that might be needed by another freezing task or a kernel driver
during suspend, and is a common site where idle userspace tasks are
blocked.

Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Colin Cross <ccross@android.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Colin Cross 2013-05-06 23:50:17 +00:00 committed by Rafael J. Wysocki
parent 1c441e9212
commit 9745cdb36d
1 changed files with 3 additions and 1 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

4
fs/select.c
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@ -27,6 +27,7 @@
#include <linux/rcupdate.h> #include <linux/rcupdate.h>
#include <linux/hrtimer.h> #include <linux/hrtimer.h>
#include <linux/sched/rt.h> #include <linux/sched/rt.h>
#include <linux/freezer.h>
#include <asm/uaccess.h> #include <asm/uaccess.h>
@ -236,7 +237,8 @@ int poll_schedule_timeout(struct poll_wqueues *pwq, int state,
set_current_state(state); set_current_state(state);
if (!pwq->triggered) if (!pwq->triggered)
rc = schedule_hrtimeout_range(expires, slack, HRTIMER_MODE_ABS); rc = freezable_schedule_hrtimeout_range(expires, slack,
HRTIMER_MODE_ABS);
__set_current_state(TASK_RUNNING); __set_current_state(TASK_RUNNING);
/* /*