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 28C57344D8C; Thu, 2 Jul 2026 17:17:27 +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=1783012649; cv=none; b=XJV1fTVJlIzaGTfdjBCYy2qRRY8a4YE3XFMRkALpi5uKPSocBYP+08I+5gFgWp/HeRkVy22B525ZFxUf/zD0v0NdSmXTZfOszNqbOso7ix1dJ5b77yOX/CPXMKNZ4vFHpqAR660m5HAWaMJbGtD106xJaSsc1UoGGT/2vO0sVEo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783012649; c=relaxed/simple; bh=eunayg+T4vCH2a//b3uL8j23puIHdfmVQdkw5mBFvFg=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=e0RivuaUpjhxz9gSdsNhRHvNBJAeJ9Nvwd4rppxbWkZLvA23QJaXSWQQp7JYCWSBGbG5keJEinzZHBynhD9I3L4BKHtWPDR8lxWPHA0k2klZV2J/lf19sREJ8L3TEPDxs/uiDOag1YtVr7MZBRTCOf7MhOvQOVbNIigwB1Xlv5k= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=OV0GRM8X; 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="OV0GRM8X" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 292B41F00A3A; Thu, 2 Jul 2026 17:17:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1783012647; bh=r7SpLxZbspL6XS8P9x+tydUy80YkcthGS0kwmq/oA40=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=OV0GRM8Xw14V/XJHNFLeOXS6ZRg96+zCIwS8jw1vF/leCd+5ijvesos21lWjHFLZk Yo14tOzcMD5W+ODOYUVYUR23gopp7e+w1uHnJNWq5qWfu3lUhImTvZc5Mj5ORQA23z mQo9dHsu6YHd1wn5xWK5j5FVjjAIJWwwyuaQZaJ7whcdAvvruae7/5uNXEEmxyF9UI or9m0787yhtBQO5QHScsJqoM2EL29hCO4eWfrrxAsj6UIjbBW+rpRLu7EtQIBBnKcJ 6Io8LbgYFYSIL0OSEA/qnD3/zLDAkWc9V00Iz5tIk/4Pk18y0eKMNLW1x7NBfri+AR cuRqo1C/WJQSA== From: SJ Park To: Cc: SJ Park , Andrew Morton , damon@lists.linux.dev, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [RFC PATCH v1.1 1/3] mm/damon: add damon_region->last_probe_hits Date: Thu, 2 Jul 2026 10:17:09 -0700 Message-ID: <20260702171714.88278-2-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260702171714.88278-1-sj@kernel.org> References: <20260702171714.88278-1-sj@kernel.org> Precedence: bulk X-Mailing-List: damon@lists.linux.dev 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: SJ 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 805e089ff4f2f..4f7e305b261c3 100644 --- a/include/linux/damon.h +++ b/include/linux/damon.h @@ -68,10 +68,10 @@ 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 b2fc15a3804ff..d45dc87fbbd9c 100644 --- a/mm/damon/core.c +++ b/mm/damon/core.c @@ -302,8 +302,10 @@ 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; @@ -2047,8 +2049,10 @@ 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++; } @@ -3239,6 +3243,8 @@ 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