From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx138.postini.com [74.125.245.138]) by kanga.kvack.org (Postfix) with SMTP id 0B3836B002C for ; Wed, 8 Feb 2012 10:26:49 -0500 (EST) Date: Wed, 8 Feb 2012 15:26:46 +0000 From: Mel Gorman Subject: Re: [PATCH 00/15] Swap-over-NBD without deadlocking V8 Message-ID: <20120208152645.GK5938@suse.de> References: <1328568978-17553-1-git-send-email-mgorman@suse.de> <20120207132745.GH5938@suse.de> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-15 Content-Disposition: inline In-Reply-To: Sender: owner-linux-mm@kvack.org List-ID: To: Hillf Danton Cc: Andrew Morton , Linux-MM , Linux-Netdev , LKML , David Miller , Neil Brown , Peter Zijlstra On Wed, Feb 08, 2012 at 08:51:11PM +0800, Hillf Danton wrote: > On Tue, Feb 7, 2012 at 9:27 PM, Mel Gorman wrote: > > On Tue, Feb 07, 2012 at 08:45:18PM +0800, Hillf Danton wrote: > >> If it is feasible to bypass hang by tuning min_mem_kbytes, > > > > No. Increasing or descreasing min_free_kbytes changes the timing but it > > will still hang. > > > >> things may > >> become simpler if NICs are also tagged. > > > > That would mean making changes to every driver and they do not necessarily > > know what higher level protocol like TCP they are transmitting. How is > > that simpler? What is the benefit? > > > The benefit is to avoid allocating sock buffer in softirq by recycling, > then the changes in VM core maybe less. > The VM is responsible for swapping. It's reasonable that the core VM has responsibility for it without trying to shove complexity into drivers or elsewhere unnecessarily. I see some benefit in following on by recycling some skbs and only allocating from softirq if no recycled skbs are available. That potentially improves performance but I do not recycling as a replacement. -- Mel Gorman SUSE Labs -- 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/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: email@kvack.org