From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755261AbZHMRbu (ORCPT ); Thu, 13 Aug 2009 13:31:50 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755251AbZHMRbt (ORCPT ); Thu, 13 Aug 2009 13:31:49 -0400 Received: from mail-gx0-f215.google.com ([209.85.217.215]:39757 "EHLO mail-gx0-f215.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755229AbZHMRbt convert rfc822-to-8bit (ORCPT ); Thu, 13 Aug 2009 13:31:49 -0400 MIME-Version: 1.0 In-Reply-To: <200908130805.36787.a1426z@gawab.com> References: <200908122007.43522.ngupta@vflare.org> <4A837D5A.3070407@vflare.org> <200908130805.36787.a1426z@gawab.com> Date: Thu, 13 Aug 2009 23:01:49 +0530 Message-ID: Subject: Re: compcache as a pre-swap area (was: [PATCH] swap: send callback when swap slot is freed) From: Nitin Gupta To: Al Boldi Cc: Hugh Dickins , Matthew Wilcox , Ingo Molnar , Peter Zijlstra , linux-kernel@vger.kernel.org, linux-mm@kvack.org Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Aug 13, 2009 at 10:35 AM, Al Boldi wrote: > Nitin Gupta wrote: >> BTW, last time compcache was not accepted due to lack of performance >> numbers. Now the project has lot more data for various cases: >> http://code.google.com/p/compcache/wiki/Performance >> Still need to collect data for worst-case behaviors and such... > > I checked the link, and it looks like you are positioning compcache as a swap > replacement.  If so, then repositioning it as a compressed pre-swap area > working together with normal swap-space, if available, may yield a much more > powerful system. > > compcache is really not really a swap replacement. Its just another swap device that compresses data and stores it in memory itself. You can have disk based swaps along with ramzswap (name of block device). Nitin