From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760040AbdKQRfi (ORCPT ); Fri, 17 Nov 2017 12:35:38 -0500 Received: from bombadil.infradead.org ([65.50.211.133]:43150 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1759996AbdKQRfd (ORCPT ); Fri, 17 Nov 2017 12:35:33 -0500 Date: Fri, 17 Nov 2017 09:35:21 -0800 From: Christoph Hellwig To: Tetsuo Handa Cc: Minchan Kim , Huang Ying , Mel Gorman , Vladimir Davydov , Michal Hocko , Johannes Weiner , Andrew Morton , Shakeel Butt , Greg Thelen , linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 1/2] mm,vmscan: Kill global shrinker lock. Message-ID: <20171117173521.GA21692@infradead.org> References: <1510609063-3327-1-git-send-email-penguin-kernel@I-love.SAKURA.ne.jp> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1510609063-3327-1-git-send-email-penguin-kernel@I-love.SAKURA.ne.jp> User-Agent: Mutt/1.8.3 (2017-05-23) X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Nov 14, 2017 at 06:37:42AM +0900, Tetsuo Handa wrote: > Since do_shrink_slab() can reschedule, we cannot protect shrinker_list > using one RCU section. But using atomic_inc()/atomic_dec() for each > do_shrink_slab() call will not impact so much. But you could use SRCU.. From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pf0-f200.google.com (mail-pf0-f200.google.com [209.85.192.200]) by kanga.kvack.org (Postfix) with ESMTP id E96A26B0253 for ; Fri, 17 Nov 2017 12:35:33 -0500 (EST) Received: by mail-pf0-f200.google.com with SMTP id g75so2910675pfg.4 for ; Fri, 17 Nov 2017 09:35:33 -0800 (PST) Received: from bombadil.infradead.org (bombadil.infradead.org. [65.50.211.133]) by mx.google.com with ESMTPS id i3si3111906pld.296.2017.11.17.09.35.32 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 17 Nov 2017 09:35:32 -0800 (PST) Date: Fri, 17 Nov 2017 09:35:21 -0800 From: Christoph Hellwig Subject: Re: [PATCH 1/2] mm,vmscan: Kill global shrinker lock. Message-ID: <20171117173521.GA21692@infradead.org> References: <1510609063-3327-1-git-send-email-penguin-kernel@I-love.SAKURA.ne.jp> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1510609063-3327-1-git-send-email-penguin-kernel@I-love.SAKURA.ne.jp> Sender: owner-linux-mm@kvack.org List-ID: To: Tetsuo Handa Cc: Minchan Kim , Huang Ying , Mel Gorman , Vladimir Davydov , Michal Hocko , Johannes Weiner , Andrew Morton , Shakeel Butt , Greg Thelen , linux-mm@kvack.org, linux-kernel@vger.kernel.org On Tue, Nov 14, 2017 at 06:37:42AM +0900, Tetsuo Handa wrote: > Since do_shrink_slab() can reschedule, we cannot protect shrinker_list > using one RCU section. But using atomic_inc()/atomic_dec() for each > do_shrink_slab() call will not impact so much. But you could use SRCU.. -- 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