From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=0.5 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,URIBL_DBL_ABUSE_MALW,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id E7209C35240 for ; Wed, 29 Jan 2020 18:07:55 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id C6121206D4 for ; Wed, 29 Jan 2020 18:07:55 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="G6Ah1duV" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727198AbgA2SHz (ORCPT ); Wed, 29 Jan 2020 13:07:55 -0500 Received: from bombadil.infradead.org ([198.137.202.133]:58056 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726245AbgA2SHz (ORCPT ); Wed, 29 Jan 2020 13:07:55 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=In-Reply-To:Content-Type:MIME-Version :References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=Ti7tqcCoopz85yAZx6ODwlyVLtxIWBrtp0ypbKnSIIQ=; b=G6Ah1duV6XYd7U02JYqwA9701 BYJscf1GahK9hRHau93+bYNyshPFIk3rCBti2rpJlwa00ZJ8bV9SriQfyVqTZpxx0W07qDSzmMS7y 3Xk1UhhS0XHt9ksGdXz6TNCibZJoRghnWkWg8dusjDQmdcrhUw2l1vFyM1m8Uh1vjtsj8uPYkIrHh u//Nm5ZeFBzPFR2Tj5OIPsXrKv8RB8HOLuJRwKl8G66axlVYIxXTedxqM9CdWMC7CvdYgOndg/4M9 Q+LAyDjlHHGUuIoY5S0lVRuPO1kcNj8lijzvMLmsNS8Fzx655R3eyr8T4hcdSlRFvhDY+a+F2rOWG 9tqRrZJ1w==; Received: from j217100.upc-j.chello.nl ([24.132.217.100] helo=noisy.programming.kicks-ass.net) by bombadil.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1iwrk9-0005CU-1G; Wed, 29 Jan 2020 18:07:13 +0000 Received: from hirez.programming.kicks-ass.net (hirez.programming.kicks-ass.net [192.168.1.225]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by noisy.programming.kicks-ass.net (Postfix) with ESMTPS id E6CCD300606; Wed, 29 Jan 2020 19:05:26 +0100 (CET) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id B3EF12B7A8626; Wed, 29 Jan 2020 19:07:09 +0100 (CET) Date: Wed, 29 Jan 2020 19:07:09 +0100 From: Peter Zijlstra To: sjpark@amazon.com Cc: akpm@linux-foundation.org, SeongJae Park , sj38.park@gmail.com, acme@kernel.org, amit@kernel.org, brendan.d.gregg@gmail.com, corbet@lwn.net, dwmw@amazon.com, mgorman@suse.de, rostedt@goodmis.org, kirill@shutemov.name, brendanhiggins@google.com, colin.king@canonical.com, minchan@kernel.org, vdavydov.dev@gmail.com, vdavydov@parallels.com, linux-mm@kvack.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, Ingo Molnar , Mark Rutland , Alexander Shishkin , Jiri Olsa , Namhyung Kim Subject: Re: Re: Re: [PATCH v2 0/9] Introduce Data Access MONitor (DAMON) Message-ID: <20200129180709.GS14879@hirez.programming.kicks-ass.net> References: <20200129125615.GQ14879@hirez.programming.kicks-ass.net> <20200129143758.896-1-sjpark@amazon.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200129143758.896-1-sjpark@amazon.com> User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Jan 29, 2020 at 03:37:58PM +0100, sjpark@amazon.com wrote: > On Wed, 29 Jan 2020 13:56:15 +0100 Peter Zijlstra wrote: > > > On Tue, Jan 28, 2020 at 01:00:33PM +0100, sjpark@amazon.com wrote: > > > > > I worried whether it could be a bother to send the mail to everyone in the > > > section, but seems it was an unnecessary worry. Adding those to recipients. > > > You can get the original thread of this patchset from > > > https://lore.kernel.org/linux-mm/20200128085742.14566-1-sjpark@amazon.com/ > > > > I read first patch (the document) and still have no friggin clue. > > Do you mean the document has insufficient description only? If so, could you > please point me me which information do you want to be added? There was a lot of words; but I'm still not sure what it actually does. I've read some of the code that followed; is it simply sampling the page-table access bit? It did some really weird things though, like that whole 3 regions thing. Also, you wrote you wanted feedback from perf people; but it doesn't use perf, what are you asking? Perf can do address based sampling of memops, I suspect you can create something using that.