From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pa0-f46.google.com (mail-pa0-f46.google.com [209.85.220.46]) by kanga.kvack.org (Postfix) with ESMTP id 67E5E6B0253 for ; Wed, 4 Nov 2015 05:10:35 -0500 (EST) Received: by pabfh17 with SMTP id fh17so49178549pab.0 for ; Wed, 04 Nov 2015 02:10:35 -0800 (PST) Received: from olympic.calvaedi.com (olympic.calvaedi.com. [89.202.194.163]) by mx.google.com with ESMTPS id ez3si1062745pab.130.2015.11.04.02.10.32 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 04 Nov 2015 02:10:33 -0800 (PST) Message-ID: <5639D98A.80308@calva.com> Date: Wed, 04 Nov 2015 11:10:18 +0100 From: John Hughes MIME-Version: 1.0 Subject: Re: [Bug 107111] New: page allocation failure but there seem to be free pages References: <20151103141603.261893b44e0cd6e704921fb6@linux-foundation.org> In-Reply-To: <20151103141603.261893b44e0cd6e704921fb6@linux-foundation.org> Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: Andrew Morton , linux-mm@kvack.org Cc: bugzilla-daemon@bugzilla.kernel.org, Mel Gorman On 03/11/15 23:16, Andrew Morton wrote: > (switched to email. Please respond via emailed reply-to-all, not via the > bugzilla web interface). OK. > > On Tue, 03 Nov 2015 16:21:06 +0000 bugzilla-daemon@bugzilla.kernel.org wrote: > >> https://bugzilla.kernel.org/show_bug.cgi?id=107111 >> >> Bug ID: 107111 >> Summary: page allocation failure but there seem to be free >> pages >> Product: Memory Management >> Version: 2.5 >> Kernel Version: 4.2.3 >> Hardware: IA-64 >> 18 > Note: IA64. It isn't tested much and perhaps this triggered an oddity. Sorry, user error, it's x86-64, not IA64, a KVM guest running on a "Intel(R) Xeon(R) CPU 3050". > The kernel could and should have satisfied this order-1 GFP_ATOMIC > IRQ-context allocation from the DMA zone. But it did not do so. Bug. Looking back in my kern.logs I confirm that I've only seen this on kernel 4.2.3, never on the 3.18.19 I was running up to 16/10/2015. It happens up to 15 times a day, and, so far, hasn't happened since I upped /proc/sys/vm/min_free_kbytes to 8192. -- John Hughes. -- 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