From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 23BD923E342; Sun, 21 Jun 2026 21:42:44 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1782078165; cv=none; b=UGYjD/LkqZHeFTUVkaoBLR2Jm53BBnm3qhoMVGTnHHxZ/VZrqjuH2ARw7cWBs/c759dRPFTHiENm2ey0XcUQSOGuAaGmpvijA4P5yZxrDTBqWtKlbZMAchwb2G6v3bxGetIngHu7+hPtyIKyV7Yuk7FxfEyPnykcX3sz748CoYc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1782078165; c=relaxed/simple; bh=0JM1jzoF+1wsff6kJRSnHxo/QYw0zeqH0YhMirNLiJM=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=T9EKDcVsWi5BDXkfGJzvc+c08sARXA/mR9KCepkNl2lSKiQPO9DV/eTmey1ZFYVgJutH7QZnxgF1J1OGxBQnX7J3HNpW9YsnkdL7LLHcjIKxFYgZe3TZwT0HjIDvSu1g2E4/Ee04bJazhYM3Lx+tycW9aYXcDvmdIxU+xiddYEo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=MZGpNdrg; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="MZGpNdrg" 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> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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