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 E62CCCD98F2 for ; Sun, 21 Jun 2026 21:42:49 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 1824A6B008A; Sun, 21 Jun 2026 17:42:47 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 0E4236B008C; Sun, 21 Jun 2026 17:42:47 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id EC6A26B0092; Sun, 21 Jun 2026 17:42:46 -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 BCE876B008A for ; Sun, 21 Jun 2026 17:42:46 -0400 (EDT) Received: from smtpin30.hostedemail.com (lb01a-stub [10.200.18.249]) by unirelay05.hostedemail.com (Postfix) with ESMTP id 2CED3404E0 for ; Sun, 21 Jun 2026 21:42:46 +0000 (UTC) X-FDA: 84905244732.30.B141943 Received: from tor.source.kernel.org (tor.source.kernel.org [172.105.4.254]) by imf23.hostedemail.com (Postfix) with ESMTP id 9BF79140002 for ; Sun, 21 Jun 2026 21:42:44 +0000 (UTC) Authentication-Results: imf23.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b=MZGpNdrg; spf=pass (imf23.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=1782078164; 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=fjSOxWy3PSIxUzStq8QVNZF0VBLkNihghY1tHfnbiPk=; b=incOEOVqRo8jTl1FgmoVgeC+GBchrW1r+iQmkbW17JKCmIycg+yQYueHVdNSjQavD/efyU NvkgPc8vnNhmwsxMg2kBF+fYAqy9VhI/rPxZ0G1fMdRuYFgf13QVeNAPD5iOxypqgTYVMw B3sI/V6EPuzVmGOOdbUCNYr2jxz5Jss= ARC-Seal: i=1; a=rsa-sha256; d=hostedemail.com; s=arc-20220608; cv=none; t=1782078164; b=er/70JSIirgge5sKawWph8zAejmslJfjAGlr3+sEHOj40M52cppUKBVrxWScqQlWchvsOD wWG3WBAfVRaOz5Qx8+M4USQKRUlaI3R6Ru1A6mMhU8z0AOWEarYTQVoeUW6HBBCfXg71xY 4zm47B/5eOOc8gkNLMPzQ7OPlUKSHis= ARC-Authentication-Results: i=1; imf23.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b=MZGpNdrg; spf=pass (imf23.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 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by tor.source.kernel.org (Postfix) with ESMTP id 32B446001A; Sun, 21 Jun 2026 21:42:44 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 40FD11F00A3D; Sun, 21 Jun 2026 21:42:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1782078163; bh=fjSOxWy3PSIxUzStq8QVNZF0VBLkNihghY1tHfnbiPk=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=MZGpNdrgIMU2RMIZP+UzifZQc3BwsiTl0OCfN0IEQQppQ6OVYcRa5t/yIf3h7Vq86 DpKFiSjPxcvnhwbKNevow0an6AY44T1YKu/ObY/Tr+iK6rNWPRJuW986Mnq6OGCL9h 5lBUHzMWbH3kPtLLVIY0ZDBFO4zf16fTmNIKStpzuOT/bIhedWgjifuRA+/ux9Tgeg DFSyYa1fZjjFcdxbP6DIufbc7+uHPOcjpeJtaswNoiGZbP9jBz3E+flvpOJfhCzI04 Oyaeg+zU6jQscrr3JSbdsqNa3dQb5blC5nULYm7jMi45gBhctNUBWQzqWc1KJ30vTV f1SkXWI+1OUJA== From: SeongJae Park To: Cc: SeongJae Park , Andrew Morton , damon@lists.linux.dev, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [RFC PATCH 1/3] mm/damon: add damon_region->last_probe_hits Date: Sun, 21 Jun 2026 14:42:28 -0700 Message-ID: <20260621214231.13449-2-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260621214231.13449-1-sj@kernel.org> References: <20260621214231.13449-1-sj@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Stat-Signature: n83f7tjngpuooyqbcskynj8k5qg3fo4o X-Rspam-User: X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: 9BF79140002 X-HE-Tag: 1782078164-312005 X-HE-Meta: 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 aF3J/5Cz Z0GiHOe9mM47fVJEp5IqT6pU9wGo1dYD2RfQ94XQpcgtCaC5XQEb7ZGP5uvCpnFcdNXKGUGPM7E8b0L3Ke/P+s3Tqe3kKMxMEJowKik+i26vyLEipXZiMHkNWB+LoEqtx+mMSBhseLNiwJEKfegtugyC6UgFeJ5+Sy/hijlZBdSCRlJq4ZvOkXWJJi389uBxE8BACW4se53zsc4W/UE/QQEaCTqSJc1nDWkcQ6lUNb/KfBEfFVykXSOIHmTJSvjaabN0J17AdHMqv+M76L4ZQICjC7g== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Add new damon_region filed, last_probe_hits. Maintain fully accumulated probe_hits values from the last aggregation interval in the field. Signed-off-by: SeongJae Park --- include/linux/damon.h | 2 +- mm/damon/core.c | 10 ++++++++-- 2 files changed, 9 insertions(+), 3 deletions(-) diff --git a/include/linux/damon.h b/include/linux/damon.h index fc3d467dc2e34..f0dd45ca788f5 100644 --- a/include/linux/damon.h +++ b/include/linux/damon.h @@ -70,10 +70,10 @@ struct damon_region { unsigned int nr_accesses; unsigned char probe_hits[DAMON_MAX_PROBES]; struct list_head list; - unsigned int age; /* private: Internal value for age calculation. */ unsigned int last_nr_accesses; + unsigned char last_probe_hits[DAMON_MAX_PROBES]; }; /** diff --git a/mm/damon/core.c b/mm/damon/core.c index 4f7954b383d18..e84f2f1b07cc6 100644 --- a/mm/damon/core.c +++ b/mm/damon/core.c @@ -304,8 +304,10 @@ struct damon_region *damon_new_region(unsigned long start, unsigned long end) region->ar.start = start; region->ar.end = end; region->nr_accesses = 0; - for (i = 0; i < DAMON_MAX_PROBES; i++) + for (i = 0; i < DAMON_MAX_PROBES; i++) { region->probe_hits[i] = 0; + region->last_probe_hits[i] = 0; + } INIT_LIST_HEAD(®ion->list); region->age = 0; @@ -2024,8 +2026,10 @@ static void kdamond_reset_aggregated(struct damon_ctx *c) damon_nr_regions(t), nr_probes); r->last_nr_accesses = r->nr_accesses; r->nr_accesses = 0; - for (i = 0; i < DAMON_MAX_PROBES; i++) + for (i = 0; i < DAMON_MAX_PROBES; i++) { + r->last_probe_hits[i] = r->probe_hits[i]; r->probe_hits[i] = 0; + } } ti++; } @@ -3216,6 +3220,8 @@ static void damon_split_region_at(struct damon_target *t, new->nr_accesses = r->nr_accesses; /* todo: do this for only installed probes */ memcpy(new->probe_hits, r->probe_hits, sizeof(r->probe_hits)); + memcpy(new->last_probe_hits, r->last_probe_hits, + sizeof(r->last_probe_hits)); damon_insert_region(new, r, damon_next_region(r), t); } -- 2.47.3