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| author | Colin Cross <ccross@android.com> | 2013-05-06 23:50:16 +0000 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2013-05-12 14:16:22 +0200 |
| commit | 1c441e921201d523b5a6036aea22b0b426bf1af2 (patch) | |
| tree | 3fbf6842e6c22f8f4af04b4e86401e442b9b2fbd | |
| parent | e2610b268bb74d24866a9578e78d8c3de90ed596 (diff) | |
| download | linux-stable-1c441e921201d523b5a6036aea22b0b426bf1af2.tar.gz linux-stable-1c441e921201d523b5a6036aea22b0b426bf1af2.tar.bz2 linux-stable-1c441e921201d523b5a6036aea22b0b426bf1af2.zip | |
epoll: use freezable blocking call
Avoid waking up every thread sleeping in an epoll_wait 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>
| -rw-r--r-- | fs/eventpoll.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/fs/eventpoll.c b/fs/eventpoll.c index deecc7294a67..0cff4434880d 100644 --- a/fs/eventpoll.c +++ b/fs/eventpoll.c @@ -34,6 +34,7 @@ #include <linux/mutex.h> #include <linux/anon_inodes.h> #include <linux/device.h> +#include <linux/freezer.h> #include <asm/uaccess.h> #include <asm/io.h> #include <asm/mman.h> @@ -1602,7 +1603,8 @@ fetch_events: } spin_unlock_irqrestore(&ep->lock, flags); - if (!schedule_hrtimeout_range(to, slack, HRTIMER_MODE_ABS)) + if (!freezable_schedule_hrtimeout_range(to, slack, + HRTIMER_MODE_ABS)) timed_out = 1; spin_lock_irqsave(&ep->lock, flags); |