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 Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 38034CD5BC9 for ; Mon, 25 May 2026 16:48:29 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 46EA56B0005; Mon, 25 May 2026 12:48:28 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 41EDF6B0088; Mon, 25 May 2026 12:48:28 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 30E266B008A; Mon, 25 May 2026 12:48:28 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0011.hostedemail.com [216.40.44.11]) by kanga.kvack.org (Postfix) with ESMTP id 210616B0005 for ; Mon, 25 May 2026 12:48:28 -0400 (EDT) Received: from smtpin09.hostedemail.com (lb01a-stub [10.200.18.249]) by unirelay04.hostedemail.com (Postfix) with ESMTP id C3A961A012B for ; Mon, 25 May 2026 16:48:27 +0000 (UTC) X-FDA: 84806525454.09.97A6A89 Received: from tor.source.kernel.org (tor.source.kernel.org [172.105.4.254]) by imf10.hostedemail.com (Postfix) with ESMTP id 3C22DC000D for ; Mon, 25 May 2026 16:48:26 +0000 (UTC) Authentication-Results: imf10.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b=AYW7aLWw; spf=pass (imf10.hostedemail.com: domain of sj@kernel.org designates 172.105.4.254 as permitted sender) smtp.mailfrom=sj@kernel.org; dmarc=pass (policy=quarantine) header.from=kernel.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1779727706; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=X8+rOuAsw06eyL6NJoqLksg0G4h6H1UZY/EYUW4dvjM=; b=QU3J5/C/YbrxEq6IGrTVGBjlLptqJ7tusMfuny4FTqHJQ+Ti+VFKR7bud9ppWGJ3xVCq/s cLvMJmHk26swo+xyvr6BWu7dzmSrCit2b68h5enOYmTTtJiSNBsH7+Uyz+p5ETxW8JZY4f NKnOptSQBtCszYn8eVU0HCY+v/OkOY0= ARC-Authentication-Results: i=1; imf10.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b=AYW7aLWw; spf=pass (imf10.hostedemail.com: domain of sj@kernel.org designates 172.105.4.254 as permitted sender) smtp.mailfrom=sj@kernel.org; dmarc=pass (policy=quarantine) header.from=kernel.org ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1779727706; a=rsa-sha256; cv=none; b=hjX0yMIkgmhfBHYIIfQ2XJr5DLR9XLAq84Xfnv44wPgUWgflJrpEdAAIHxSJFyGhQS+DHX iPAucDl+H/8zt9RDIXUbeuMnj26zT2Xkr4+zIH/+hJVGtwT33H54FINy01nbgVnR/YS/Au UdZo/CrPJKSKAjMOP6zqDBwXz4j6dws= Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by tor.source.kernel.org (Postfix) with ESMTP id A7FC66008A; Mon, 25 May 2026 16:48:25 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 03C321F000E9; Mon, 25 May 2026 16:48:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1779727705; bh=X8+rOuAsw06eyL6NJoqLksg0G4h6H1UZY/EYUW4dvjM=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=AYW7aLWw9P8M36AJuw5en93j8uTOmjGw8dW+zJWYXUxbA2d2yDHupGk7l1/L0HRbr oMv1bauOvKGJw9Du/krlKcu4OysJEimCSPZ/L+6fIVs6AAjj1281k7BjxXMdp0UgdJ ygrF/WvixQqhNUyvQpOcDtrNx+C2wJ5PCJ9mVAgM6wyfwnFsKg5byVkPEudyV0ADwO 8kJGAoJ7VyCW1HRjPTMvGsK17e+MiXYPraj9G4SXmaMVPtT9Usl1tcfYGmSv8qJCCk In3ZvvkRInC1vLLTb38QK3r4Ob3gDeK7oVyFEPSLrOgqQZ0I2FWiRqWsJH+3UM7rNb Z4wDIe5gBs9vQ== From: SeongJae Park To: Gutierrez Asier Cc: SeongJae Park , artem.kuzin@huawei.com, stepanov.anatoly@huawei.com, wangkefeng.wang@huawei.com, yanquanmin1@huawei.com, zuoze1@huawei.com, damon@lists.linux.dev, akpm@linux-foundation.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [RFC PATCH v2 0/4] mm/damon: Introduce a huge page collapsing mechanism using auto tuning Date: Mon, 25 May 2026 09:48:16 -0700 Message-ID: <20260525164816.8864-1-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Stat-Signature: rntqn9brk8f1pgasjwzw5ui5cbur6gwy X-Rspam-User: X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: 3C22DC000D X-HE-Tag: 1779727706-218537 X-HE-Meta: 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 0AA67EUE EAj8aTTPWRgLtpWTxKOw1/THIYHLm8gdplWJTXRCM6iT4tIw+KwOfXlsk/FUEEUcSZqevhD8Jsgl1aVtWQAyyytO2UW5e6KCDSrtC43GOjUXckeTiC8RhTOVs43I4G9d9ku/X6paOzO2Kbg1pkd+PAwtgogIiefMV4APyJWELGvfDlSMrurszuMALcs2TDtxYBD+gRNzy4IEldPGNspB62WGvamGHp+wSrFZ40uLKTG7P2C/ZrsTsqg8E3NMBM69fEqrnbN5LkNHNCPHIAnBo4YXvsnQOAczVYA8lQpwlimFGGfSnBY9W1pudPg== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Mon, 25 May 2026 16:53:17 +0300 Gutierrez Asier wrote: > Hi SJ, > > On 5/23/2026 8:17 PM, SeongJae Park wrote: > > On Fri, 22 May 2026 14:55:14 +0000 wrote: [...] > >> A new module is introduced to demonstrate the use of huge pages > >> collapse autotuning. The goal is to collapse hot regions of a given > >> process into huge pages. The module launches a kdamond thread for a > >> certain task provided by the user through monitored_pid module argument. > >> Hugepage goal autotuning will automatically adjust the aggressiveness > >> of hot region collapses. > > > > Having a module for the demonstration purpose sounds good. But, for the > > demonstration purpose, as I previousoly commented, making it as a sample module > > (put under /samples/damon/) or just drop when you drop RFC tag would be better. > > > > Let me know if this module is aimed to be as is even after you drop RFC tag. > I'll move it to samples. I'll keep the RFC in the next version still, > so I make sure that the major details are polished before I drop RFC tag. Makes sense. In the case, I think we can further reduce the number of parameters of the sample module and make the code simpler. [...] > >> TODO > >> ==== > >> - Support page splitting for cold hugepages. > > > > Sounds good! By using two DAMOS schemes that doing collapsing and splitting, I > > think we can make more complete access-aware THP system. > My thought was to add cold page splitting as a separate RFC in the future. Makes sense :) Thanks, SJ [...]