The patch titled
Subject: ipc/msg.c: use freezable blocking call
has been added to the -mm tree. Its filename is
msgrcv-use-freezable-blocking-call.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/msgrcv-use-freezable-blocking-call.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/msgrcv-use-freezable-blocking-call.patch
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------------------------------------------------------
From: Yogesh Gaur <yn.gaur@xxxxxxxxxxx>
Subject: ipc/msg.c: use freezable blocking call
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
Signed-off-by: Yogesh Gaur <yn.gaur@xxxxxxxxxxx>
Signed-off-by: Manjeet Pawar <manjeet.p@xxxxxxxxxxx>
Reviewed-by : 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 | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff -puN ipc/msg.c~msgrcv-use-freezable-blocking-call ipc/msg.c
--- a/ipc/msg.c~msgrcv-use-freezable-blocking-call
+++ a/ipc/msg.c
@@ -37,6 +37,7 @@
#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>
@@ -915,7 +916,7 @@ long do_msgrcv(int msqid, void __user *b
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
_
Patches currently in -mm which might be from yn.gaur@xxxxxxxxxxx are
restart_syscall-use-freezable-blocking-call.patch
msgrcv-use-freezable-blocking-call.patch
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