From mboxrd@z Thu Jan 1 00:00:00 1970 Subject: Re: [PATCH] (1/2) reverse mapping VM for 2.5.23 (rmap-13b) From: Steven Cole In-Reply-To: References: Content-Type: text/plain Content-Transfer-Encoding: 7bit Date: 19 Jun 2002 13:04:52 -0600 Message-Id: <1024513492.13955.13.camel@spc9.esa.lanl.gov> Mime-Version: 1.0 Sender: owner-linux-mm@kvack.org Return-Path: To: Craig Kulesa Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org List-ID: On Wed, 2002-06-19 at 05:18, Craig Kulesa wrote: > > > Where: http://loke.as.arizona.edu/~ckulesa/kernel/rmap-vm/ > > This patch implements Rik van Riel's patches for a reverse mapping VM > atop the 2.5.23 kernel infrastructure. The principal sticky bits in > the port are correct interoperability with Andrew Morton's patches to > cleanup and extend the writeback and readahead code, among other things. > This patch reinstates Rik's (active, inactive dirty, inactive clean) > LRU list logic with the rmap information used for proper selection of pages > for eviction and better page aging. It seems to do a pretty good job even > for a first porting attempt. A simple, indicative test suite on a 192 MB > PII machine (loading a large image in GIMP, loading other applications, > heightening memory load to moderate swapout, then going back and > manipulating the original Gimp image to test page aging, then closing all > apps to the starting configuration) shows the following: > > 2.5.22 vanilla: > Total kernel swapouts during test = 29068 kB > Total kernel swapins during test = 16480 kB > Elapsed time for test: 141 seconds > > 2.5.23-rmap13b: > Total kernel swapouts during test = 40696 kB > Total kernel swapins during test = 380 kB > Elapsed time for test: 133 seconds > > Although rmap's page_launder evicts a ton of pages under load, it seems to > swap the 'right' pages, as it doesn't need to swap them back in again. > This is a good sign. [recent 2.4-aa work pretty nicely too] > > Various details for the curious or bored: > > - Tested: UP, 16 MB < mem < 256 MB, x86 arch. > Untested: SMP, highmem, other archs. ^^^ I tried to boot 2.5.23-rmap13b on a dual PIII without success. Freeing unused kernel memory: 252k freed hung here with CONFIG_SMP=y Adding 1052248k swap on /dev/sda6. Priority:0 extents:1 Adding 1052248k swap on /dev/sdb1. Priority:0 extents:1 The above is the edited dmesg output from booting 2.5.23-rmap13b as an UP kernel, which successfully booted on the same 2-way box. Steven -- 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/