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 DB49B3D6CD8; Sun, 26 Jul 2026 17:39:46 +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=1785087588; cv=none; b=W8Y0XavCQuCEdTTi7D9c23GByDXFWKYy+JAWRwT/vRkC1/uDeo3TEmyvVQdp9GrBLlSiCQqSzk0LWS/wWWH/VyX8P+RB1X4o3gJBYNSi4X3Mk9VBOz1DEnHEvt312XDF7wm6yTjPihdL4p2OXTp+BjSGywuHl4tZpu/1lyigQAI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785087588; c=relaxed/simple; bh=dnQrMCeGscnx8qS0aoL3UJNj+b5DIOgUbyGs9Zfdhu0=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=JF6nz3NQMYhjw3F/TjWdoZJmD6PhTUFRQnclT2kbU3eRkxO0qevUK4DBfo3nOMHmhTzQBQ7xTS1wWRbZTr214L5U08sWA91rAI5roj2dlCmIhs1fhfsoDUc84Y7N5vxQOtYoGPyNh00ibU+xrNm3caMv3++8/XAWGFacM0OcbgY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=UwueIUNx; 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="UwueIUNx" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 98B4E1F00AC4; Sun, 26 Jul 2026 17:39:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1785087586; bh=orUmWJfivc5NuWXSfNpxR3gihoLgZa1C4mXxNXYJ/08=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=UwueIUNxxuaobnaz9kqKPah/yMCNFJ2l08rRXpIDqPgTNeGZLwz3PRMFOrgKKh+ex 2Htz3KHUAvO5pbRdXM7Zcu93N3DInSFctBumVnS3bHXBVZ6hfYT2ijRFP4ym7+gb4S iLyWuRExpRUEgafPxpSuGS7y1jV4eospBiai4Y56XVBVKArcnZkqRZd1E1/kyfu3LF uFIywRRlV1+7Xfd6BGBpf6BAs426KB0WQa0vqqyyYd6fZMWX0SZnlISfg3zAnFDIiP lFWCmDr3SUNaUDFNA2vf4m14yEaDseilHneVwPs9q7D2/MOwvkSi8uZF+bNQnF52Pe V+iJU/l7Ssqow== 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 v2 07/17] mm/damon/core: introduce damon_operations->prep_probes() Date: Sun, 26 Jul 2026 10:39:23 -0700 Message-ID: <20260726173935.94046-8-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260726173935.94046-1-sj@kernel.org> References: <20260726173935.94046-1-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 damon_prep needs to be executed by the underlying DAMON operation set. Extend the operation set callback list for the execution of damon_prep actions. If the underlying operation set implements the callback, DAMON core executes it in the monitoring preparation time. Signed-off-by: SJ Park --- include/linux/damon.h | 4 ++++ mm/damon/core.c | 18 +++++++++++++++++- 2 files changed, 21 insertions(+), 1 deletion(-) diff --git a/include/linux/damon.h b/include/linux/damon.h index 255b20e44287f..f5b0f16305b30 100644 --- a/include/linux/damon.h +++ b/include/linux/damon.h @@ -629,6 +629,7 @@ enum damon_ops_id { * @update: Update operations-related data structures. * @prepare_access_checks: Prepare next access check of target regions. * @check_accesses: Check the accesses to target regions. + * @prep_probes: Prepare applying probes for each region. * @apply_probes: Apply probes for each region. * @get_scheme_score: Get the score of a region for a scheme. * @apply_scheme: Apply a DAMON-based operation scheme. @@ -656,6 +657,8 @@ enum damon_ops_id { * last preparation and update the number of observed accesses of each region. * It should also return max number of observed accesses that made as a result * of its update. The value will be used for regions adjustment threshold. + * @prep_probes should execute required &struct damon_prep for next &struct + * damon_probe applications to each region. * @apply_probes should apply the data attribute probes to each region and * accordingly update the probe hits counter of the region. It should also * set &damon_region->sampling_addr of each region if ``set_samples`` is true. @@ -678,6 +681,7 @@ struct damon_operations { void (*update)(struct damon_ctx *context); void (*prepare_access_checks)(struct damon_ctx *context); unsigned int (*check_accesses)(struct damon_ctx *context); + void (*prep_probes)(struct damon_ctx *context, bool set_samples); unsigned int (*apply_probes)(struct damon_ctx *context, bool set_samples, bool return_max_wsum); int (*get_scheme_score)(struct damon_ctx *context, diff --git a/mm/damon/core.c b/mm/damon/core.c index c74dee56efee8..bd2dc702a9811 100644 --- a/mm/damon/core.c +++ b/mm/damon/core.c @@ -156,6 +156,18 @@ static struct damon_prep *damon_nth_prep(int n, struct damon_probe *p) return NULL; } +static bool damon_has_prep(struct damon_ctx *c) +{ + struct damon_prep *prep; + struct damon_probe *probe; + + damon_for_each_probe(probe, c) { + damon_for_each_prep(prep, probe) + return true; + } + return false; +} + struct damon_filter *damon_new_filter(enum damon_filter_type type, bool matching, bool allow) { @@ -3868,6 +3880,7 @@ static int kdamond_fn(void *data) unsigned long next_ops_update_sis = ctx->next_ops_update_sis; unsigned long sample_interval = ctx->attrs.sample_interval; bool access_check_disabled = damon_has_probe_weights(ctx); + bool do_prep = damon_has_prep(ctx) && ctx->ops.prep_probes; unsigned int max_merge_score = 0, max_wsum; bool get_max_wsum; @@ -3876,6 +3889,8 @@ static int kdamond_fn(void *data) if (!access_check_disabled && ctx->ops.prepare_access_checks) ctx->ops.prepare_access_checks(ctx); + if (do_prep) + ctx->ops.prep_probes(ctx, access_check_disabled); kdamond_usleep(sample_interval); ctx->passed_sample_intervals++; @@ -3890,7 +3905,8 @@ static int kdamond_fn(void *data) else get_max_wsum = false; max_wsum = ctx->ops.apply_probes(ctx, - access_check_disabled, get_max_wsum); + access_check_disabled && !do_prep, + get_max_wsum); if (get_max_wsum) max_merge_score = max_wsum; } -- 2.47.3