From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andrey Ryabinin Subject: [PATCH 4/6] mm/vmscan: remove redundant current_may_throttle() check Date: Thu, 15 Mar 2018 19:45:51 +0300 Message-ID: <20180315164553.17856-4-aryabinin@virtuozzo.com> References: <20180315164553.17856-1-aryabinin@virtuozzo.com> Mime-Version: 1.0 Return-path: DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=virtuozzo.com; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version; bh=21KwmvCTSUPnZHj3pXAyeH6anKkTMi8uLurXAUGswBU=; b=RNnuMtHIpi4PxapykdLWbrqc5WHQBJxJYuHuJ0A+fzncIduNti94fHQQsQQsnUrQqe/Da0aDxT+17mImZ1qGlc7RfdJpKoHXmoX1dDHAM6ZXKR63Ah+5CmPM1PCXD5gxWN4odv4G0lyUgcKUo+IgurnuQyEQhnL2JTwzfeN/DBY= In-Reply-To: <20180315164553.17856-1-aryabinin@virtuozzo.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: Andrew Morton Cc: Andrey Ryabinin , Mel Gorman , Tejun Heo , Johannes Weiner , Michal Hocko , linux-mm@kvack.org, linux-kernel@vger.kernel.org, cgroups@vger.kernel.org Only kswapd can have non-zero nr_immediate, and current_may_throttle() is always true for kswapd (PF_LESS_THROTTLE bit is never set) thus it's enough to check stat.nr_immediate only. Signed-off-by: Andrey Ryabinin --- mm/vmscan.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/vmscan.c b/mm/vmscan.c index 0d5ab312a7f4..a8f6e4882e00 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -1806,7 +1806,7 @@ shrink_inactive_list(unsigned long nr_to_scan, struct lruvec *lruvec, * that pages are cycling through the LRU faster than * they are written so also forcibly stall. */ - if (stat.nr_immediate && current_may_throttle()) + if (stat.nr_immediate) congestion_wait(BLK_RW_ASYNC, HZ/10); } -- 2.16.1