From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx153.postini.com [74.125.245.153]) by kanga.kvack.org (Postfix) with SMTP id 66AC06B13F0 for ; Wed, 8 Feb 2012 04:21:23 -0500 (EST) Received: by eekc13 with SMTP id c13so129186eek.14 for ; Wed, 08 Feb 2012 01:21:21 -0800 (PST) Content-Type: text/plain; charset=utf-8; format=flowed; delsp=yes Subject: Re: [Linaro-mm-sig] [PATCH 11/15] mm: trigger page reclaim in alloc_contig_range() to stabilize watermarks References: <1328271538-14502-1-git-send-email-m.szyprowski@samsung.com> <1328271538-14502-12-git-send-email-m.szyprowski@samsung.com> <20120203140428.GG5796@csn.ul.ie> Date: Wed, 08 Feb 2012 10:21:18 +0100 MIME-Version: 1.0 Content-Transfer-Encoding: Quoted-Printable From: "Michal Nazarewicz" Message-ID: In-Reply-To: Sender: owner-linux-mm@kvack.org List-ID: To: Mel Gorman , sandeep patil Cc: Marek Szyprowski , Ohad Ben-Cohen , Daniel Walker , Russell King , Arnd Bergmann , Jesse Barker , Jonathan Corbet , linux-kernel@vger.kernel.org, Dave Hansen , linaro-mm-sig@lists.linaro.org, linux-mm@kvack.org, Kyungmin Park , KAMEZAWA Hiroyuki , Andrew Morton , Rob Clark , linux-arm-kernel@lists.infradead.org, linux-media@vger.kernel.org On Wed, 08 Feb 2012 03:04:18 +0100, sandeep patil = wrote: > There's another problem I am facing with zone watermarks and CMA. > > Test details: > Memory : 480 MB of total memory, 128 MB CMA region > Test case : around 600 MB of file transfer over USB RNDIS onto target > System Load : ftpd with console running on target. > No one is doing CMA allocations except for the DMA allocations done by= the > drivers. > > Result : After about 300MB transfer, I start getting GFP_ATOMIC > allocation failures. This only happens if CMA region is reserved. [...] > Total memory available is way above the zone watermarks. So, we ended > up starving > UNMOVABLE/RECLAIMABLE atomic allocations that cannot fallback on CMA r= egion. This looks like something Mel warned me about. I don't really have a go= od solution for that yet. ;/ -- = Best regards, _ _ .o. | Liege of Serenely Enlightened Majesty of o' \,=3D./ `o ..o | Computer Science, Micha=C5=82 =E2=80=9Cmina86=E2=80=9D Nazarewicz= (o o) ooo +------------------ooO--(_)--Ooo-- -- 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