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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) X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: 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.