Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752617AbcDZM5x (ORCPT ); Tue, 26 Apr 2016 08:57:53 -0400 Received: from mail-wm0-f68.google.com ([74.125.82.68]:35165 "EHLO mail-wm0-f68.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752264AbcDZM4p (ORCPT ); Tue, 26 Apr 2016 08:56:45 -0400 From: Michal Hocko To: , Andrew Morton Cc: LKML , Michal Hocko , Alex Deucher , =?UTF-8?q?Christian=20K=C3=B6nig?= , David Airlie , Vlastimil Babka Subject: [PATCH 17/18] drm/radeon: make radeon_mn_get wait for mmap_sem killable Date: Tue, 26 Apr 2016 14:56:24 +0200 Message-Id: <1461675385-5934-18-git-send-email-mhocko@kernel.org> X-Mailer: git-send-email 2.8.0.rc3 In-Reply-To: <1461675385-5934-1-git-send-email-mhocko@kernel.org> References: <1461675385-5934-1-git-send-email-mhocko@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1300 Lines: 35 From: Michal Hocko radeon_mn_get which is called during ioct path relies on mmap_sem for write. If the waiting task gets killed by the oom killer it would block oom_reaper from asynchronous address space reclaim and reduce the chances of timely OOM resolving. Wait for the lock in the killable mode and return with EINTR if the task got killed while waiting. Cc: Alex Deucher Cc: "Christian König" Cc: David Airlie Reviewed-by: Christian König Acked-by: Vlastimil Babka Signed-off-by: Michal Hocko --- drivers/gpu/drm/radeon/radeon_mn.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/radeon/radeon_mn.c b/drivers/gpu/drm/radeon/radeon_mn.c index eef006c48584..896f2cf51e4e 100644 --- a/drivers/gpu/drm/radeon/radeon_mn.c +++ b/drivers/gpu/drm/radeon/radeon_mn.c @@ -186,7 +186,9 @@ static struct radeon_mn *radeon_mn_get(struct radeon_device *rdev) struct radeon_mn *rmn; int r; - down_write(&mm->mmap_sem); + if (down_write_killable(&mm->mmap_sem)) + return ERR_PTR(-EINTR); + mutex_lock(&rdev->mn_lock); hash_for_each_possible(rdev->mn_hash, rmn, node, (unsigned long)mm) -- 2.8.0.rc3