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 6A0572459FE; Fri, 10 Jul 2026 13:47:02 +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=1783691223; cv=none; b=oEiCbrGI6/7laqH42VoOvHTuIQjdXYmX38lZw9/rSi2143Ip9N/LFX1hhTBI2HV0v38SsBHZArhz+Q29fniQjvMdq+TrtOsfVzqT0rtvNoKh4qcHY8W2bRPg4i/4DMVO6VFKOkklHa76dWs+tSMoweQcfvyX/UsgQw3xpxcEAeQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783691223; c=relaxed/simple; bh=9EyMomfNpgIKrmRqleQi79yOzZUamG2ZlpJjdR/jboU=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=CAMyszP4/Ccinm/hbwMN8Czj8LTtASO4BL2lsrlLoz7rijRBiTwb620VdvwXOmUxhdQ7mZDvbdlsvkRX+Sf8eV/YLpoGcfEV6bfquJHh5PzM8ONbl7P2V+EC3SPaZYrFc6LLrHt4Mq2g+KjlvN9EP08BmB/lt2eV9A+T6e/oqVA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=h+GZnBQF; 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="h+GZnBQF" Received: by smtp.kernel.org (Postfix) with ESMTPSA id DCB1E1F00AC4; Fri, 10 Jul 2026 13:47:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1783691222; bh=IV0EL5uoIkcnMjmKSre6/DXBTN2a0ADkNneX2xN/Zgw=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=h+GZnBQFWF3S+QHnUQcBAWTNuuqGOYf13WlRZGm34i8t9SEhEAlcnPFh1+SO1dd/g 34w1MqXFm3ZOB0BvK6M+AQexvrGwgH7K/1bnWJUtfuxUoT6m3ZU9uTFmkigA2s1ZJ+ wRIYf511g+Cq3zCFPVc+fljCJG7Imr4vezVGdfp9ii40+o1bwBAr9+Ff9cdrBFakxr iN9GV/3u/nRz3PQ3QKbxjU6abzvuYrEF23Gp+VFglg1kGtzGpnpYO6A6n/PG/s8xV6 CWUBL5ll6VjDcjgTkxZZdLKmN3h3xazG4JublqWzTTvmL571Rb52SLvUideSgvEG+T 62g+eDOQGwONQ== From: SJ Park To: Andrew Morton Cc: SJ Park , damon@lists.linux.dev, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 05/19] mm/damon/core: implement damon_probe_hits_wsum() Date: Fri, 10 Jul 2026 06:46:34 -0700 Message-ID: <20260710134651.18084-6-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260710134651.18084-1-sj@kernel.org> References: <20260710134651.18084-1-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 When damon_probe->weight is set, the weighted sum of probe hits will be useful. It will be useful for not only the users but also DAMON internal logics like regions merging. Implement a function for calculating it. Signed-off-by: SJ Park --- include/linux/damon.h | 2 ++ mm/damon/core.c | 24 ++++++++++++++++++++++++ 2 files changed, 26 insertions(+) diff --git a/include/linux/damon.h b/include/linux/damon.h index e7acd8e610a64..f69442a9d4312 100644 --- a/include/linux/damon.h +++ b/include/linux/damon.h @@ -1012,6 +1012,8 @@ 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); +unsigned int damon_probe_hits_wsum(struct damon_region *r, bool last, + 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 9f6cdd810bd8a..fea97399b5754 100644 --- a/mm/damon/core.c +++ b/mm/damon/core.c @@ -393,6 +393,30 @@ static bool damon_is_last_region(struct damon_region *r, return list_is_last(&r->list, &t->regions_list); } +/** + * damon_probe_hits_wsum() - Returns probe hits weighted sum of a region. + * @r: region to get the weighted sum of. + * @last: if the request is for last-window aggregated probe hits. + * @ctx: context of &r. + * + * Return: the weighted sum of probe hits of the region. + */ +unsigned int damon_probe_hits_wsum(struct damon_region *r, bool last, + struct damon_ctx *ctx) +{ + struct damon_probe *probe; + unsigned int sum = 0; + int i = 0; + + damon_for_each_probe(probe, ctx) { + if (last) + sum += r->last_probe_hits[i++] * probe->weight; + else + sum += r->probe_hits[i++] * probe->weight; + } + return sum; +} + /* * Check whether a region is intersecting an address range * -- 2.47.3