The patch titled
Subject: ipc/msg.c: msgsnd: use freezable blocking call
has been added to the -mm tree. Its filename is
ipc-msgc-msgsnd-use-freezable-blocking-call.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/ipc-msgc-msgsnd-use-freezable-blocking-call.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/ipc-msgc-msgsnd-use-freezable-blocking-call.patch
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------------------------------------------------------
From: Maninder Singh <maninder1.s@xxxxxxxxxxx>
Subject: ipc/msg.c: msgsnd: use freezable blocking call
Avoid waking up every thread sleeping in a msgsnd 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: Vaneet narang <v.narang@xxxxxxxxxxx>
Signed-off-by: Maninder Singh <maninder1.s@xxxxxxxxxxx>
Cc: Yogesh Gaur <yn.gaur@xxxxxxxxxxx>
Cc: Manjeet Pawar <manjeet.p@xxxxxxxxxxx>
Cc: Ajeet Yadav <ajeet.y@xxxxxxxxxxx>
Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Cc: Tejun Heo <tj@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
ipc/msg.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff -puN ipc/msg.c~ipc-msgc-msgsnd-use-freezable-blocking-call ipc/msg.c
--- a/ipc/msg.c~ipc-msgc-msgsnd-use-freezable-blocking-call
+++ a/ipc/msg.c
@@ -673,7 +673,7 @@ long do_msgsnd(int msqid, long mtype, vo
ipc_unlock_object(&msq->q_perm);
rcu_read_unlock();
- schedule();
+ freezable_schedule();
rcu_read_lock();
ipc_lock_object(&msq->q_perm);
_
Patches currently in -mm which might be from maninder1.s@xxxxxxxxxxx are
ipc-msgc-msgsnd-use-freezable-blocking-call.patch
msgrcv-use-freezable-blocking-call.patch
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