From mboxrd@z Thu Jan 1 00:00:00 1970 Subject: Re: A scrub daemon (prezeroing) From: David Woodhouse In-Reply-To: References: Content-Type: text/plain Date: Thu, 27 Jan 2005 12:15:24 +0000 Message-Id: <1106828124.19262.45.camel@hades.cambridge.redhat.com> Mime-Version: 1.0 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 List-ID: On Fri, 2005-01-21 at 12:29 -0800, Christoph Lameter wrote: > Adds management of ZEROED and NOT_ZEROED pages and a background daemon > called scrubd. scrubd is disabled by default but can be enabled > by writing an order number to /proc/sys/vm/scrub_start. If a page > is coalesced of that order or higher then the scrub daemon will > start zeroing until all pages of order /proc/sys/vm/scrub_stop and > higher are zeroed and then go back to sleep. Some architectures tend to have spare DMA engines lying around. There's no need to use the CPU for zeroing pages. How feasible would it be for scrubd to use these? -- dwmw2 -- 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: aart@kvack.org