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]
Message-ID: <154166793129.10655.10914379833120458156.stgit@localhost.localdomain>
Date:   Thu, 08 Nov 2018 12:05:31 +0300
From:   Kirill Tkhai <ktkhai@...tuozzo.com>
To:     miklos@...redi.hu, ktkhai@...tuozzo.com,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 3/5] fuse: Wake up req->waitq of only not background
 requests in request_end()

Currently, we wait on req->waitq in request_wait_answer()
function only, and it's never used for background requests.
Since wake_up() is not a light-weight macros, instead of this,
it unfolds in really called function, which makes locking
operations taking some cpu cycles, let's avoid its call
for the case we definitely know it's completely useless.

Signed-off-by: Kirill Tkhai <ktkhai@...tuozzo.com>
---
 fs/fuse/dev.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c
index 7374a23b1bc8..cc9e5a9bb147 100644
--- a/fs/fuse/dev.c
+++ b/fs/fuse/dev.c
@@ -464,8 +464,11 @@ static void request_end(struct fuse_conn *fc, struct fuse_req *req)
 		fc->active_background--;
 		flush_bg_queue(fc);
 		spin_unlock(&fc->bg_lock);
+	} else {
+		/* Wake up waiter sleeping in request_wait_answer() */
+		wake_up(&req->waitq);
 	}
-	wake_up(&req->waitq);
+
 	if (req->end)
 		req->end(fc, req);
 put_request:

Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ