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 63F5013B58C; Fri, 10 Jul 2026 00:23:59 +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=1783643040; cv=none; b=ayzb2EKmlM2UUOoWseg5LJ+cdAAw4FLIq+26aaz4FysP0vznGMsXgY/ryCkUsSgX9izCDUmv/G0A/y5UUqZm1Z2uJL3YpZ9NDnzakF44Kt2q252aUPyW6zPRYX6GMh3RDpAEFAEdYxBo+kDEWToX0EbiOycAX/mgNsaDyw1u99Y= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783643040; c=relaxed/simple; bh=UKo1R/EKs9cTuGDz1STLEQT1oD/C139mx0UO/5pr1As=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=hwe5neMPCdYED561EK58MxpcRPJ0iYLOnMLAD/aFB3K4XZJQ94xjwtRBs4Ms/3MhFt5WLmm/wB9PenQ7m171z9fo/8Lpf0S0DeAgQ50NaPquwnFJroxcOUzxzo7o4VIKrYvFlRACwZ2n3Jc+N3qFAbn0COIknQ9DTJlS1BWAz7s= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=e8yqmZjT; 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="e8yqmZjT" Received: by smtp.kernel.org (Postfix) with ESMTPSA id D574D1F00A3A; Fri, 10 Jul 2026 00:23:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1783643039; bh=xQG5oz4wU5m7lLv6nGv8jRYxqbEgbwiFogSXia05QXQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=e8yqmZjTc50JUEQg8thjVPpN+oNdUpYfsEzoLhQSc5tmlvCGwJlHDexGc7QhVCxhF Xx7Zc40GV12X1bzDBVqPf6HuF2BF5M3hPYxTp04xuyvtR1FIZrktVgbtV9MmX/ozai ERZdpSUqZbgYVAZ5SwNBHGtY65gjgIsQN8WLKSOfJXbfJPgfzAZ5pIJt9jH8LfliIM OIW6l1CrkN1BhG/wKSDv9bWWrTqkrRUQXP+zM7nLcqh8YtlmIFjrC7LD/mOVvJx/JC RfRaKUOT8qQqM6Y+WBaVv69t6vaJ99GT2M9Zaojxma+/ThXHxEs6gHuslrXcKL/9Or RJjmvPGGFqmfg== 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 v1.3 02/19] mm/damon/core: ask apply_probes() ops callback to set sampling address Date: Thu, 9 Jul 2026 17:23:28 -0700 Message-ID: <20260710002349.111414-3-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260710002349.111414-1-sj@kernel.org> References: <20260710002349.111414-1-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 prepare_access_checks() DAMON ops callback sets the monitoring sampling address per region. In future, DAMON will be able to call only apply_probes(). In this case, applyy_probes() may need to do the sampling address setup, to minimize unnecessary regions iteration. Update the protocol for the request. Signed-off-by: SJ Park --- include/linux/damon.h | 5 +++-- mm/damon/core.c | 2 +- mm/damon/paddr.c | 2 +- 3 files changed, 5 insertions(+), 4 deletions(-) diff --git a/include/linux/damon.h b/include/linux/damon.h index d8251c83e6e55..aee28b05acc6c 100644 --- a/include/linux/damon.h +++ b/include/linux/damon.h @@ -647,7 +647,8 @@ enum damon_ops_id { * 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. * @apply_probes should apply the data attribute probes to each region and - * accordingly update the probe hits counter of the region. + * 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. * @get_scheme_score should return the priority score of a region for a scheme * as an integer in [0, &DAMOS_MAX_SCORE]. * @apply_scheme is called from @kdamond when a region for user provided @@ -665,7 +666,7 @@ 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 (*apply_probes)(struct damon_ctx *context); + void (*apply_probes)(struct damon_ctx *context, bool set_samples); int (*get_scheme_score)(struct damon_ctx *context, struct damon_region *r, struct damos *scheme); unsigned long (*apply_scheme)(struct damon_ctx *context, diff --git a/mm/damon/core.c b/mm/damon/core.c index 327398fa4ee56..9fbea6204520b 100644 --- a/mm/damon/core.c +++ b/mm/damon/core.c @@ -3692,7 +3692,7 @@ static int kdamond_fn(void *data) if (ctx->ops.check_accesses) max_nr_accesses = ctx->ops.check_accesses(ctx); if (ctx->ops.apply_probes) - ctx->ops.apply_probes(ctx); + ctx->ops.apply_probes(ctx, false); if (time_after_eq(ctx->passed_sample_intervals, next_aggregation_sis)) { diff --git a/mm/damon/paddr.c b/mm/damon/paddr.c index 6172464981730..b13bf7c6eade3 100644 --- a/mm/damon/paddr.c +++ b/mm/damon/paddr.c @@ -166,7 +166,7 @@ static bool damon_pa_filter_pass(phys_addr_t pa, struct folio *folio, return pass; } -static void damon_pa_apply_probes(struct damon_ctx *ctx) +static void damon_pa_apply_probes(struct damon_ctx *ctx, bool set_samples) { struct damon_target *t; struct damon_region *r; -- 2.47.3