From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail144.messagelabs.com (mail144.messagelabs.com [216.82.254.51]) by kanga.kvack.org (Postfix) with ESMTP id E4A546B004D for ; Sat, 31 Oct 2009 15:51:27 -0400 (EDT) Received: from zps78.corp.google.com (zps78.corp.google.com [172.25.146.78]) by smtp-out.google.com with ESMTP id n9VJpK4t023048 for ; Sat, 31 Oct 2009 19:51:21 GMT Received: from pwj11 (pwj11.prod.google.com [10.241.219.75]) by zps78.corp.google.com with ESMTP id n9VJpHaq018279 for ; Sat, 31 Oct 2009 12:51:18 -0700 Received: by pwj11 with SMTP id 11so1216266pwj.0 for ; Sat, 31 Oct 2009 12:51:17 -0700 (PDT) Date: Sat, 31 Oct 2009 12:51:14 -0700 (PDT) From: David Rientjes Subject: Re: [PATCH 2/3] page allocator: Do not allow interrupts to use ALLOC_HARDER In-Reply-To: <20091031184054.GB1475@ucw.cz> Message-ID: References: <1256650833-15516-1-git-send-email-mel@csn.ul.ie> <1256650833-15516-3-git-send-email-mel@csn.ul.ie> <20091027130924.fa903f5a.akpm@linux-foundation.org> <20091031184054.GB1475@ucw.cz> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-linux-mm@kvack.org To: Pavel Machek Cc: Andrew Morton , Mel Gorman , stable@kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, Frans Pop , Jiri Kosina , Sven Geggus , Karol Lewandowski , Tobias Oetiker , KOSAKI Motohiro , Pekka Enberg , Rik van Riel , Christoph Lameter , Stephan von Krawczynski , kernel-testers@vger.kernel.org List-ID: On Sat, 31 Oct 2009, Pavel Machek wrote: > > Giving rt tasks access to memory reserves is necessary to reduce latency, > > the privilege does not apply to interrupts that subsequently get run on > > the same cpu. > > If rt task needs to allocate memory like that, then its broken, > anyway... > Um, no, it's a matter of the kernel implementation. We allow such tasks to allocate deeper into reserves to avoid the page allocator from incurring a significant penalty when direct reclaim is required. Background reclaim has already commenced at this point in the slowpath. -- 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