From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751153AbXAII1U (ORCPT ); Tue, 9 Jan 2007 03:27:20 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751171AbXAII1U (ORCPT ); Tue, 9 Jan 2007 03:27:20 -0500 Received: from nf-out-0910.google.com ([64.233.182.189]:53547 "EHLO nf-out-0910.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751153AbXAII1U (ORCPT ); Tue, 9 Jan 2007 03:27:20 -0500 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=beta; h=received:message-id:date:from:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; b=EvdBJdkzdkx4/BUgH9qibJIfNQXRLBZqlDhgp7vhpMFVKe1SMv1w+k60/GqZvC+Xr3+ku8WNGt8HgCsL+NS6FrWwQHLIzZ2MpniuTb8icFS40khzdFnRPY/Ibn1dbY8HBEaeRxwXjfIAo62IZNEsmpJqG9qhXnBLZdZRyCmI9Vg= Message-ID: <4df04b840701090027l41fb777chcda084d1426c951a@mail.gmail.com> Date: Tue, 9 Jan 2007 16:27:18 +0800 From: "yunfeng zhang" To: linux-kernel@vger.kernel.org Subject: Re: [PATCH 2.6.16.29 1/1] memory: enhance Linux swap subsystem Cc: pavel@ucw.cz, rdunlap@xenotime.net, akpm@osdl.org In-Reply-To: <000a01c7311e$ca8c4a00$ec10480a@IBMF0038A435B7> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <000a01c7311e$ca8c4a00$ec10480a@IBMF0038A435B7> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Maybe, there should be a memory maintainer in linux kernel group. Here, I show some content from my patch (Documentation/vm_pps.txt). In brief, I make a revolution about Linux swap subsystem, the idea is described that SwapDaemon should scan and reclaim pages on UserSpace::vmalist other than current zone::active/inactive. The change will conspicuously enhance swap subsystem performance by 1) SwapDaemon can collect the statistic of process acessing pages and by it unmaps ptes, SMP specially benefits from it for we can use flush_tlb_range to unmap ptes batchly rather than frequently TLB IPI interrupt per a page in current Linux legacy swap subsystem. In fact, in some cases, we can even flush TLB without sending IPI. 2) Page-fault can issue better readahead requests since history data shows all related pages have conglomerating affinity. In contrast, Linux page-fault readaheads the pages relative to the SwapSpace position of current page-fault page. 3) It's conformable to POSIX madvise API family.