From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <3BCA2015.5080306@ucla.edu> Date: Sun, 14 Oct 2001 16:30:29 -0700 From: Benjamin Redelings I MIME-Version: 1.0 Subject: VM question: side effect of not scanning Active pages? Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org Return-Path: To: linux-kernel@vger.kernel.org, linux-mm@kvack.org List-ID: Hello, In both Andrea and Rik's VM, I have tried modifying try_to_swap_out so that a page would be skipped if it is "active". For example, I have currently modified 2.4.13-pre2 by adding: if (PageActive(page)) return 0; after testing the hardware referenced bit. This was motivated by sections of VM-improvement patches written by both Rik and Andrea. This SEEMS to increase performance, but it has another side effect. The RSS of unused daemons no longer EVER drops to 4k, which it does without this modification. The RSS does decrease (usually) to the value of shared memory, but the amount of shared memory only gets down to about 200-300k instead of decreasing to 4k. Can anyone tell me why not scanning Active page for swapout would have this effect? Thanks! -BenRI -- "I will begin again" - U2, 'New Year's Day' Benjamin Redelings I <>< http://www.bol.ucla.edu/~bredelin/ -- 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/