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 674152D73BC; Fri, 3 Jul 2026 17:06:11 +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=1783098372; cv=none; b=KAOvxLDYkyAu8sPoici/lTQvwOTtHXHUmC+QqHNId7MQHxrUyyKEfYkAzyuqA4+i0I7FlXkyktjBR5Vi+vtrC0HGBZgBJ2Z7jt+94PZmHtdXIWHJSSDFRNA7Si8vFt9tURuYQxey9yUk3xbAvkEkaPQX+PVDLyHf3dvrcyAeJ5Y= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783098372; c=relaxed/simple; bh=jrgIUoLLFqMVTSTWxKojT8UnjaDZsGJyBEimLQDP9AU=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=bwxADgDRGyd65MzsL5kj/8aTo9npEr0Xw60SNZQpgYo1GSxwK7p3/3xBn1KkDobv9Pcg+PKq/LCiFcAr4XgBG8fPtQa0nNRrWnGGfV4Nv0ub944V6AuSsdLvCkV0+mA+H/UrTlVWzBfuSDWkb0u1t/9Un948EjHC0YxHDGOl+hs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=CY+P8mRk; 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="CY+P8mRk" Received: by smtp.kernel.org (Postfix) with ESMTPSA id E0C731F00ACF; Fri, 3 Jul 2026 17:06:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1783098371; bh=Gcy9SSkJ7cJu/6jz9kUdhF88DVRVIoJailmK3qTsD+c=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=CY+P8mRkXvwTm1h8+uEnZLKWUSGsJP+g7KFLKExw/zusH2OtmFWTcknvg3fr+MGqS NT8f1io8Lt0RXDKEJ9GliUKcAEqA9CqP8uCGrtLWDZTXE59vLJaaMSS8BxTixYPCup Ijn1uHrGzog/xVlADzoufRfPJYQczPGvx2No2NBttINLyDrwhBvZsdani0Z0+ANhtE RmPhTU7BUvE26hOoEKU1lA/XvId1JudWq0iPE/CDJrpVoz3cBcSSku6VpzOOQANHxJ ZAUlhS61sSv4wLUwqLNKFbE8bTVH/lKj0vJR9RbHKGXzUnBaM8y6BvzwvzbrPY9G5v FwOzpkVpXcVJw== From: SJ Park To: Andrew Morton Cc: SJ Park , damon@lists.linux.dev, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 2/3] mm/damon/core: introduce damon_probe_hits_mvsum() Date: Fri, 3 Jul 2026 10:06:02 -0700 Message-ID: <20260703170605.94472-3-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260703170605.94472-1-sj@kernel.org> References: <20260703170605.94472-1-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