diff options
| author | Colin Cross <ccross@android.com> | 2013-05-01 18:35:05 -0700 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2013-06-25 23:11:19 +0200 |
| commit | 88c8004fd3a5fdd2378069de86b90b21110d33a4 (patch) | |
| tree | 1cdd93902f986f02c981fa75f38c77f1b2f63265 | |
| parent | 13d60f4b6ab5b702dc8d2ee20999f98a93728aec (diff) | |
futex: Use freezable blocking call
Avoid waking up every thread sleeping in a futex_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.
Signed-off-by: Colin Cross <ccross@android.com>
Cc: Rafael J. Wysocki <rjw@sisk.pl>
Cc: arve@android.com
Cc: Tejun Heo <tj@kernel.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Darren Hart <dvhart@linux.intel.com>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Link: http://lkml.kernel.org/r/1367458508-9133-8-git-send-email-ccross@android.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
| -rw-r--r-- | kernel/futex.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/kernel/futex.c b/kernel/futex.c index 49dacfb45745..c3a1a55a5214 100644 --- a/kernel/futex.c +++ b/kernel/futex.c @@ -62,6 +62,7 @@ #include <linux/ptrace.h> #include <linux/sched/rt.h> #include <linux/hugetlb.h> +#include <linux/freezer.h> #include <asm/futex.h> @@ -1808,7 +1809,7 @@ static void futex_wait_queue_me(struct futex_hash_bucket *hb, struct futex_q *q, * is no timeout, or if it has yet to expire. */ if (!timeout || timeout->task) - schedule(); + freezable_schedule(); } __set_current_state(TASK_RUNNING); } |