Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S940957AbcJTN2u (ORCPT ); Thu, 20 Oct 2016 09:28:50 -0400 Received: from mail-lf0-f53.google.com ([209.85.215.53]:36049 "EHLO mail-lf0-f53.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S935074AbcJTN2r (ORCPT ); Thu, 20 Oct 2016 09:28:47 -0400 Date: Thu, 20 Oct 2016 15:28:43 +0200 From: Michal Hocko To: zhouxianrong@huawei.com Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, akpm@linux-foundation.org, viro@zeniv.linux.org.uk, mingo@redhat.com, peterz@infradead.org, hannes@cmpxchg.org, mgorman@techsingularity.net, vbabka@suse.cz, vdavydov.dev@gmail.com, minchan@kernel.org, riel@redhat.com, zhouxiyu@huawei.com, zhangshiming5@huawei.com, won.ho.park@huawei.com, tuxiaobing@huawei.com Subject: Re: [PATCH] bdi flusher should not be throttled here when it fall into buddy slow path Message-ID: <20161020132842.GM14609@dhcp22.suse.cz> References: <1476774765-21130-1-git-send-email-zhouxianrong@huawei.com> <1476967085-89647-1-git-send-email-zhouxianrong@huawei.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1476967085-89647-1-git-send-email-zhouxianrong@huawei.com> User-Agent: Mutt/1.6.0 (2016-04-01) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 657 Lines: 21 On Thu 20-10-16 20:38:05, zhouxianrong@huawei.com wrote: > From: z00281421 > > The bdi flusher should be throttled only depends on > own bdi and is decoupled with others. > > separate PGDAT_WRITEBACK into PGDAT_ANON_WRITEBACK and > PGDAT_FILE_WRITEBACK avoid scanning anon lru and it is ok > then throttled on file WRITEBACK. Could you please answer questions from http://lkml.kernel.org/r/20161018114207.GD12092@dhcp22.suse.cz before coming up with new and even more complex patches please? I would really like to understand the issue you are seeing before jumping into patches... Thanks! -- Michal Hocko SUSE Labs