From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail172.messagelabs.com (mail172.messagelabs.com [216.82.254.3]) by kanga.kvack.org (Postfix) with ESMTP id 2F06D6B0012 for ; Sun, 29 May 2011 20:29:08 -0400 (EDT) Received: by pxi10 with SMTP id 10so2117938pxi.8 for ; Sun, 29 May 2011 17:29:06 -0700 (PDT) MIME-Version: 1.0 In-Reply-To: References: From: Andrew Lutomirski Date: Sun, 29 May 2011 20:28:46 -0400 Message-ID: Subject: Re: Easy portable testcase! (Re: Kernel falls apart under light memory pressure (i.e. linking vmlinux)) Content-Type: text/plain; charset=ISO-8859-1 Sender: owner-linux-mm@kvack.org List-ID: To: Minchan Kim Cc: mgorman@suse.de, KOSAKI Motohiro , aarcange@redhat.com, kamezawa.hiroyu@jp.fujitsu.com, fengguang.wu@intel.com, andi@firstfloor.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, hannes@cmpxchg.org, riel@redhat.com On Sun, May 29, 2011 at 2:28 PM, Minchan Kim wrote: >> >> It works only if the zone meets high watermark. If allocation is >> faster than reclaim(ie, it's true for slow swap device), the zone >> would remain congested. >> It means swapout would block. >> As we see the OOM log, we can know that DMA32 zone can't meet high watermark. >> >> Does my guessing make sense? > > Hi Andrew. > I got failed your scenario in my machine so could you be willing to > test this patch for proving my above scenario? > The patch is just revert patch of 0e093d99[do not sleep on the > congestion queue...] for 2.6.38.6. > I would like to test it for proving my above zone congestion scenario. > > I did it based on 2.6.38.6 for your easy apply so you must apply it > cleanly on vanilla v2.6.38.6. > And you have to add !pgdat_balanced and shrink_slab patch. No, because my laptop just decided that it doesn't like to turn on. :( I'll test it on my VM on Tuesday and (fingers crossed) on my repaired laptop next weekend. --Andy -- 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