From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-qc0-f172.google.com (mail-qc0-f172.google.com [209.85.216.172]) by kanga.kvack.org (Postfix) with ESMTP id 785796B0036 for ; Thu, 22 May 2014 12:45:57 -0400 (EDT) Received: by mail-qc0-f172.google.com with SMTP id l6so6244395qcy.31 for ; Thu, 22 May 2014 09:45:57 -0700 (PDT) Received: from mx1.redhat.com (mx1.redhat.com. [209.132.183.28]) by mx.google.com with ESMTP id j7si490199qai.23.2014.05.22.09.45.56 for ; Thu, 22 May 2014 09:45:56 -0700 (PDT) Message-ID: <537E1EE6.8080102@redhat.com> Date: Thu, 22 May 2014 11:59:34 -0400 From: Rik van Riel MIME-Version: 1.0 Subject: Re: [PATCH 2/3] fs/superblock: Avoid locking counting inodes and dentries before reclaiming them References: <1400749779-24879-1-git-send-email-mgorman@suse.de> <1400749779-24879-3-git-send-email-mgorman@suse.de> In-Reply-To: <1400749779-24879-3-git-send-email-mgorman@suse.de> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: Mel Gorman , Andrew Morton Cc: Johannes Weiner , Hugh Dickins , Tim Chen , Dave Chinner , Yuanhan Liu , Bob Liu , Jan Kara , Linux Kernel , Linux-MM , Linux-FSDevel On 05/22/2014 05:09 AM, Mel Gorman wrote: > From: Tim Chen > > We remove the call to grab_super_passive in call to super_cache_count. > This becomes a scalability bottleneck as multiple threads are trying to do > memory reclamation, e.g. when we are doing large amount of file read and > page cache is under pressure. The cached objects quickly got reclaimed > down to 0 and we are aborting the cache_scan() reclaim. But counting > creates a log jam acquiring the sb_lock. > Signed-off-by: Tim Chen > Signed-off-by: Mel Gorman Acked-by: Rik van Riel -- All rights reversed -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org