linux-kernel - [PATCH 4/5] splice: Use sync wakeup for splice_from_pipe

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Sun, 29 Sep 2013 15:14:37 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Alexander Viro <viro@...iv.linux.org.uk>
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	Jens Axboe <axboe@...nel.dk>, Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>
Subject: [PATCH 4/5] splice: Use sync wakeup for splice_from_pipe_next()

Sync wakeup is a hint to the scheduler that means a waker would go to
sleep right soon.  In splice_from_pipe_next(), it calls pipe_wait()
after calling wakeup_pipe_writers() so it'd be better using sync
wakeup rather than normal one.

Cc: Jens Axboe <axboe@...nel.dk>
Cc: Ingo Molnar <mingo@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Signed-off-by: Namhyung Kim <namhyung@...nel.org>
---
 fs/splice.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/splice.c b/fs/splice.c
index 0325e8b0d816..9fb7dc5ef061 100644
--- a/fs/splice.c
+++ b/fs/splice.c
@@ -872,7 +872,7 @@ int splice_from_pipe_next(struct pipe_inode_info *pipe, struct splice_desc *sd)
 			return -ERESTARTSYS;
 
 		if (sd->need_wakeup) {
-			wakeup_pipe_writers(pipe, false);
+			wakeup_pipe_writers(pipe, true);
 			sd->need_wakeup = false;
 		}
 
-- 
1.7.9.2

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/