Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757019AbYAOCWW (ORCPT ); Mon, 14 Jan 2008 21:22:22 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752024AbYAOCWO (ORCPT ); Mon, 14 Jan 2008 21:22:14 -0500 Received: from fgwmail7.fujitsu.co.jp ([192.51.44.37]:39332 "EHLO fgwmail7.fujitsu.co.jp" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751348AbYAOCWM (ORCPT ); Mon, 14 Jan 2008 21:22:12 -0500 Date: Tue, 15 Jan 2008 11:20:56 +0900 From: KOSAKI Motohiro To: KAMEZAWA Hiroyuki Subject: Re: [RFC][PATCH 3/5] add /dev/mem_notify device Cc: kosaki.motohiro@jp.fujitsu.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Marcelo Tosatti , Daniel Spang , Rik van Riel , Andrew Morton In-Reply-To: <20080115111035.d516639a.kamezawa.hiroyu@jp.fujitsu.com> References: <20080115100029.1178.KOSAKI.MOTOHIRO@jp.fujitsu.com> <20080115111035.d516639a.kamezawa.hiroyu@jp.fujitsu.com> Message-Id: <20080115110918.118B.KOSAKI.MOTOHIRO@jp.fujitsu.com> MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit X-Mailer: Becky! ver. 2.42 [ja] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 720 Lines: 25 Hi Kame > > + if (pressure) { > > + nr_wakeup = max_t(int, atomic_read(&nr_watcher_task)>>4, 100); > > + atomic_long_set(&last_mem_notify, jiffies); > > + wake_up_locked_nr(&mem_wait, nr_wakeup); > > + } > What is this for ? and Why ? > Are there too many waiters ? my intent is for avoid thundering herd. 100 is heuristic value. and too many wakeup cause too much memory freed. I don't want it. of course, if any problem happened, I will change. Do you dislike it? -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/