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 79C62349B1C; Thu, 2 Jul 2026 17:17:29 +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=1783012650; cv=none; b=mHEBFfV1R1icyQ2l5hgXQMLqACZy7zr4ouuad7/N1vxUSMfDV8+C5O/A1KZEeIpdShLS1NNQwRXbWa6+3REYDpY1f267YnegNgajl7BfAlaHXGU2PLabQlvtSq+cm9Cgj5YxT22+TSrSz/l9jZU/Et1ApCW8SeLmktqh526JucY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783012650; c=relaxed/simple; bh=jrgIUoLLFqMVTSTWxKojT8UnjaDZsGJyBEimLQDP9AU=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=fKf01swycLllflhMy1dtRic/SrpaSYqyJrd6+mqAB6nwWqMTXfqT59SkwHoOHVbZE7CVh6urO1BsRTWHR7KuVHtYcqRByDyRzA3BfHC1fzUsevLFY/pE1gu6Fo09/8O/7VgB0dENtL8yYI4AhH3tbOTpw0hFkW7ja6jRPVnNQM0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=OPEK96h9; 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="OPEK96h9" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1E7831F000E9; Thu, 2 Jul 2026 17:17:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1783012649; bh=Gcy9SSkJ7cJu/6jz9kUdhF88DVRVIoJailmK3qTsD+c=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=OPEK96h95RYUYAI9vrFwZVqQZnsmZiyedlttZzRkAI5rwigEJlcgFd2sT0uYShw3Z 3lKk7eSoSK6iQ3a4rGfhLz35SMAv2rUf2V3bhgNo+Bmagdb8PBK/4GRfdTkqyn0C6F 2CP2JPeEbUxOuBvGhneAVRcsC7NJUvHu/IhBJZrcHLcJ29r5VJeUGRKELORRXPOYlg 2ck8M1kXf8iWjvhRHT3/YzEOhWiu8Qr+xCQhmfER8/y55hLXgS4Lzyo6mOUfNKBpLc AJZ6QcN8RfbvYT3G+ukKaC3P6XuVlrezx6yRWXDjyf0yQUeaUkwfXdOXdjwATcivcz 35gqKsVn0Osow== 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 2/3] mm/damon/core: introduce damon_probe_hits_mvsum() Date: Thu, 2 Jul 2026 10:17:10 -0700 Message-ID: <20260702171714.88278-3-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: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Implement a function for getting a reasonable best effort quality pseudo moving sums of probe_hits on demands. It reuses the internal function for the pseudo moving sum for data access frequency (nr_accesses). Signed-off-by: SJ Park --- include/linux/damon.h | 2 ++ mm/damon/core.c | 21 +++++++++++++++++++++ 2 files changed, 23 insertions(+) diff --git a/include/linux/damon.h b/include/linux/damon.h index 4f7e305b261c3..616bdf0954b52 100644 --- a/include/linux/damon.h +++ b/include/linux/damon.h @@ -1003,6 +1003,8 @@ void damon_add_probe(struct damon_ctx *ctx, struct damon_probe *probe); struct damon_region *damon_new_region(unsigned long start, unsigned long end); unsigned int damon_nr_accesses_mvsum(struct damon_region *r, struct damon_ctx *ctx); +unsigned char damon_probe_hits_mvsum(int probe_idx, struct damon_region *r, + struct damon_ctx *ctx); int damon_set_regions(struct damon_target *t, struct damon_addr_range *ranges, unsigned int nr_ranges, unsigned long min_region_sz); diff --git a/mm/damon/core.c b/mm/damon/core.c index d45dc87fbbd9c..871c6f5257c9e 100644 --- a/mm/damon/core.c +++ b/mm/damon/core.c @@ -273,6 +273,27 @@ unsigned int damon_nr_accesses_mvsum(struct damon_region *r, left_window_bp); } +unsigned char damon_probe_hits_mvsum(int probe_idx, struct damon_region *r, + struct damon_ctx *ctx) +{ + unsigned long sample_interval, aggr_interval; + unsigned long window_len, left_window, left_window_bp; + + sample_interval = ctx->attrs.sample_interval ? : 1; + aggr_interval = ctx->attrs.aggr_interval ? : 1; + window_len = aggr_interval / sample_interval; + if (time_after_eq(ctx->passed_sample_intervals, + ctx->next_aggregation_sis)) + left_window = 0; + else + left_window = ctx->next_aggregation_sis - + ctx->passed_sample_intervals; + left_window_bp = mult_frac(left_window, 10000, window_len); + + return damon_mvsum(r->probe_hits[probe_idx], + r->last_probe_hits[probe_idx], left_window_bp); +} + #ifdef CONFIG_DAMON_DEBUG_SANITY static void damon_verify_new_region(unsigned long start, unsigned long end) { -- 2.47.3