linux-kernel - [PATCH v2 08/13] rwsem: avoid taking wait_lock in rwsem_down_write

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Message-Id: <1363344869-15732-9-git-send-email-walken@google.com>
Date:	Fri, 15 Mar 2013 03:54:24 -0700
From:	Michel Lespinasse <walken@...gle.com>
To:	Alex Shi <alex.shi@...el.com>, Ingo Molnar <mingo@...nel.org>,
	David Howells <dhowells@...hat.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Thomas Gleixner <tglx@...utronix.de>,
	Yuanhan Liu <yuanhan.liu@...ux.intel.com>,
	Rik van Riel <riel@...hat.com>,
	Peter Hurley <peter@...leysoftware.com>,
	Dave Chinner <david@...morbit.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 08/13] rwsem: avoid taking wait_lock in rwsem_down_write_failed

In rwsem_down_write_failed(), if there are active locks after we wake up
(i.e. the lock got stolen from us), skip taking the wait_lock and go back
to sleep immediately.

Signed-off-by: Michel Lespinasse <walken@...gle.com>

---
 lib/rwsem.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/lib/rwsem.c b/lib/rwsem.c
index 64c2dc007be2..edf3d9ca670e 100644
--- a/lib/rwsem.c
+++ b/lib/rwsem.c
@@ -214,8 +214,8 @@ struct rw_semaphore __sched *rwsem_down_write_failed(struct rw_semaphore *sem)
 		sem = __rwsem_do_wake(sem, RWSEM_WAKE_READ_OWNED);
 
 	/* wait until we successfully acquire the lock */
+	set_task_state(tsk, TASK_UNINTERRUPTIBLE);
 	while (true) {
-		set_task_state(tsk, TASK_UNINTERRUPTIBLE);
 
 		/* Try acquiring the write lock. */
 		count = RWSEM_ACTIVE_WRITE_BIAS;
@@ -226,7 +226,13 @@ struct rw_semaphore __sched *rwsem_down_write_failed(struct rw_semaphore *sem)
 			break;
 
 		raw_spin_unlock_irq(&sem->wait_lock);
-		schedule();
+
+		/* Block until there are no active lockers. */
+		do {
+			schedule();
+			set_task_state(tsk, TASK_UNINTERRUPTIBLE);
+		} while (sem->count & RWSEM_ACTIVE_MASK);
+
 		raw_spin_lock_irq(&sem->wait_lock);
 	}
 
-- 
1.8.1.3
--
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