Avoid waking up every thread sleeping in a msgrcv 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.
Ref: https://lkml.org/lkml/2013/5/1/424
Backtrace:
[<
c03e3924>] (__schedule+0x0/0x5d8) from [<
c03e3f88>] (schedule+0x8c/0x90)
[<
c03e3efc>] (schedule+0x0/0x90) from [<
c01ef9f8>] (do_msgrcv+0x2e0/0x368)
[<
c01ef718>] (do_msgrcv+0x0/0x368) from [<
c01efaac>] (SyS_msgrcv+0x2c/0x38)
[<
c01efa80>] (SyS_msgrcv+0x0/0x38) from [<
c001a180>] (ret_fast_syscall+0x0/0x48)
tPlay0Cb2 R running 0 297 204 0x00000001
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: Yogesh Gaur <yn.gaur@samsung.com>
Signed-off-by: Manjeet Pawar <manjeet.p@samsung.com>
Signed-off-by: Maninder Singh <maninder1.s@samsung.com>
Reviewed-by : Ajeet Yadav <ajeet.y@samsung.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Tejun Heo <tj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
#include <linux/rwsem.h>
#include <linux/nsproxy.h>
#include <linux/ipc_namespace.h>
+#include <linux/freezer.h>
#include <asm/current.h>
#include <linux/uaccess.h>
ipc_unlock_object(&msq->q_perm);
rcu_read_unlock();
- schedule();
+ freezable_schedule();
/* Lockless receive, part 1:
* Disable preemption. We don't hold a reference to the queue