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 A7BA937104D; 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=NjbrWApy3+51LPg1Q7M0dm7/TyOa3a32keJtHxhS6iGp4kzgXR/D2dRrYRDzU1nuzfNo7xuxVZyWOhYuce+MHplFtMF95DWBIOxT3LkD6GppK+d1LiC6/EDDwfaz1uirTcvVTz7QWds/utUsBD3SlqKqb1Gw4Y2lHv8pw9qiPl8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1782078165; c=relaxed/simple; bh=RsnvypQJD1AIlkKDq+ddfQ5AKJTdMIm0t81r3PY7Mv0=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=eePcIXuPxdexxFfKIwa1mVWAM9Zstq29Xxr0uOOhLn7UX0aT+Fc76Jp4z1BbZvXetkrFiKU/wW4CJLunY0nWA/NM8apKydYO31YFu+Qr4ZKCK6KU8dxttbdke7EP9ySUVRUWOUYkO8ORnaTP70mCi/4LaDRk8tSLEVperD5c33w= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=F7dwOt2Q; 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="F7dwOt2Q" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 15D6F1F00A3A; Sun, 21 Jun 2026 21:42:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1782078164; bh=tJEseaHHCaR7alUdOrkcXmwKm0hManVh4CS4wmeZKl8=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=F7dwOt2QkmiBJlXfUdszrI5fH5+4hgFIvD7ZXE3Z/8a5xTRMbUNiPPS98OSm/zH2q nWgEOb4ZB4urgWp1/s0MDh9avHxANqF8WOj405jXQiZpD4DHj2xUihgDLpRZAyS/Al JgFHbfY+skYIjmmhrd8uJ90+/plH6P0J/tY6wWkgh3eYP2D3DzpvP3JU7J3pPiB6YJ 78hIffa8B8/LmlfUVAwwiqDm3ihxRr+QpAGSFhDIQfPLG013DRj/PQLWK4JMbD2IMB /4ew415c6MkoQh3Rx7sbvPyAL/JpiKBWwxyzctgQe1QTA4wQNjVFfyKA1kxoQroG2y q5wQNpjPsPBgQ== 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 2/3] mm/damon/core: introduce damon_probe_hits_mvsum() Date: Sun, 21 Jun 2026 14:42:29 -0700 Message-ID: <20260621214231.13449-3-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 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: SeongJae 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 f0dd45ca788f5..46394171cd2d0 100644 --- a/include/linux/damon.h +++ b/include/linux/damon.h @@ -1005,6 +1005,8 @@ 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 e84f2f1b07cc6..b5f63f2f726be 100644 --- a/mm/damon/core.c +++ b/mm/damon/core.c @@ -275,6 +275,27 @@ 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