From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <46CB01B7.3050201@redhat.com> Date: Tue, 21 Aug 2007 11:16:07 -0400 From: Rik van Riel MIME-Version: 1.0 Subject: Re: [RFC 0/7] Postphone reclaim laundry to write at high water marks References: <20070820215040.937296148@sgi.com> In-Reply-To: <20070820215040.937296148@sgi.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org Return-Path: To: Christoph Lameter Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, akpm@linux-foundation.org, dkegel@google.com, Peter Zijlstra , David Miller , Nick Piggin List-ID: Christoph Lameter wrote: > 1. First reclaiming non dirty pages. Dirty pages are deferred until reclaim > has reestablished the high marks. Then all the dirty pages (the laundry) > is written out. That sounds like a horrendously bad idea. While one process is busy freeing all the non dirty pages, other processes can allocate those pages, leaving you with no memory to free up the dirty pages! How exactly are you planning to prevent that problem? Also, writing out all the dirty pages at once seems like it could hurt latency quite badly, especially on large systems. -- Politics is the struggle between those who want to make their country the best in the world, and those who believe it already is. Each group calls the other unpatriotic. -- 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