linux-kernel - [tip:locking/urgent] locking/ww_mutex: Replace cpu_relax() with cond

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Date:   Thu, 2 Mar 2017 00:20:30 -0800
From:   tip-bot for Chris Wilson <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     fengguang.wu@...el.com, tglx@...utronix.de,
        akpm@...ux-foundation.org, torvalds@...ux-foundation.org,
        mingo@...nel.org, peterz@...radead.org,
        linux-kernel@...r.kernel.org, chris@...is-wilson.co.uk,
        paulmck@...ux.vnet.ibm.com, hpa@...or.com
Subject: [tip:locking/urgent] locking/ww_mutex: Replace cpu_relax() with
 cond_resched() for tests

Commit-ID:  2b232e0c3b3a09f3e33750aa20e314f1b80e5361
Gitweb:     http://git.kernel.org/tip/2b232e0c3b3a09f3e33750aa20e314f1b80e5361
Author:     Chris Wilson <chris@...is-wilson.co.uk>
AuthorDate: Tue, 28 Feb 2017 09:40:11 +0000
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Thu, 2 Mar 2017 09:00:38 +0100

locking/ww_mutex: Replace cpu_relax() with cond_resched() for tests

When busy-spinning on a ww_mutex_trylock(), we depend upon the other
thread advancing and releasing the lock. This can not happen on a single
CPU unless we relinquish it:

  [ ] NMI watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [kworker/0:1:18]
  ...
  [ ] Call Trace:
  [ ]  mutex_trylock()
  [ ]  test_mutex_work+0x31/0x56
  [ ]  process_one_work+0x1b4/0x2f9
  [ ]  worker_thread+0x1b0/0x27c
  [ ]  kthread+0xd1/0xd3
  [ ]  ret_from_fork+0x19/0x30

Reported-by: Fengguang Wu <fengguang.wu@...el.com>
Signed-off-by: Chris Wilson <chris@...is-wilson.co.uk>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Fixes: f2a5fec17395 ("locking/ww_mutex: Begin kselftests for ww_mutex")
Link: http://lkml.kernel.org/r/20170228094011.2595-1-chris@chris-wilson.co.uk
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 kernel/locking/test-ww_mutex.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/locking/test-ww_mutex.c b/kernel/locking/test-ww_mutex.c
index da6c9a3..3eb39c5 100644
--- a/kernel/locking/test-ww_mutex.c
+++ b/kernel/locking/test-ww_mutex.c
@@ -50,7 +50,7 @@ static void test_mutex_work(struct work_struct *work)
 
 	if (mtx->flags & TEST_MTX_TRY) {
 		while (!ww_mutex_trylock(&mtx->mutex))
-			cpu_relax();
+			cond_resched();
 	} else {
 		ww_mutex_lock(&mtx->mutex, NULL);
 	}
@@ -88,7 +88,7 @@ static int __test_mutex(unsigned int flags)
 				ret = -EINVAL;
 				break;
 			}
-			cpu_relax();
+			cond_resched();
 		} while (time_before(jiffies, timeout));
 	} else {
 		ret = wait_for_completion_timeout(&mtx.done, TIMEOUT);