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 CCF8B480DC0; Tue, 1 Sep 2026 13:25:17 +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=1788269119; cv=none; b=T07gGP4mUQAZLPNZggIDA2ZKLbTQ8Oqu92uMC8uW3JuksJi/FiWhs99n/dOKERelydRRux2B26JflmtPmsxh5SRaHnC2UmBFvDHDr5dctk390m9zqmZyQen6j3AS/+Zt4eQ6Ez2yQgLlz4IKjHnTG2GNSCAD5EPluYPLUHPOBFs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788269119; c=relaxed/simple; bh=psLetOg121R0QNdJs+CF5/aps8rlnAQgTRRu06h/FW0=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=jlD8sjex7NneBlPfMoknJvIgYGk0iih68/PiLMzqFLEtVhopbfHMCEOqGABqATmIWdjZiWdUnDpu6ewdI86CX6tohalWyx5kABAdaWTQQLS9/0ri2z5XaNNwxajjbqp47C83Br47CgomIXtZML+8RtI9FE+D7vLKb4DrA/PDOJ4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=amygPIRt; 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="amygPIRt" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 89CE11F00ACA; Tue, 1 Sep 2026 13:25:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1788269117; bh=OpyWxBrGaST77vm6YyG0Qbwcf9E6DAqPTZr9W1qgAUU=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=amygPIRtCamOEChxFe6EU72WlaHv1AGk8cE4BcJs/D2pvz4gG8DnhfNrZGQ79M9hf EPeISk5p3+OwZvXTqEFE9jS9dPAebeYlaXnIOiyoHJT9/3DLiOZTHgYYOroAg8cn7G zs1/7WCgJ5KltZFn2wgvgvLE1jjmexlDohrEAAcme7h3v3XOGGAzt86m6bpA5iBzpn KRqt+F+AYR7GbCSzzsag3rWWV6c1TO289VU7RqcLKUZrH9dZ/hb7jGCBkbWz5rHnTo CzOg7xc13ImIL22vADZuFPfif8AUhihNp2z/gT3AyLV5vWlMnRYoR8EgbUXmABRjrx yWEW+C6tpRZmA== From: SJ Park To: Andrew Morton Cc: SJ Park , damon@lists.linux.dev, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH v1.1 08/17] mm/damon/paddr: support damon_prep Date: Tue, 1 Sep 2026 06:24:55 -0700 Message-ID: <20260901132506.99243-9-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260901132506.99243-1-sj@kernel.org> References: <20260901132506.99243-1-sj@kernel.org> Precedence: bulk X-Mailing-List: damon@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Implement damon_operations->prep_probes() callback. Support the only existing prep action, DAMON_PREP_SET_PGIDLE in a way similar to what it was doing for the access check preparation: unset page table accessed bits and set PG_Idle flag. Reuse the function for the access check preparation. Signed-off-by: SJ Park --- mm/damon/paddr.c | 35 +++++++++++++++++++++++++++++++++++ 1 file changed, 35 insertions(+) diff --git a/mm/damon/paddr.c b/mm/damon/paddr.c index 6f756f8493894..c1e7d7a4f40df 100644 --- a/mm/damon/paddr.c +++ b/mm/damon/paddr.c @@ -105,6 +105,40 @@ static unsigned int damon_pa_check_accesses(struct damon_ctx *ctx) return max_nr_accesses; } +static void damon_pa_prep_probes_region(struct damon_region *r, + struct damon_probe *probe, struct damon_ctx *ctx) +{ + struct damon_prep *p; + + damon_for_each_prep(p, probe) { + switch (p->action) { + case DAMON_PREP_SET_PGIDLE: + damon_pa_mkold(damon_pa_phys_addr(r->sampling_addr, + ctx->addr_unit)); + break; + default: + break; + } + } +} + +static void damon_pa_prep_probes(struct damon_ctx *ctx, bool set_samples) +{ + struct damon_target *t; + struct damon_region *r; + struct damon_probe *p; + + damon_for_each_target(t, ctx) { + damon_for_each_region(r, t) { + if (set_samples) + r->sampling_addr = damon_rand(ctx, r->ar.start, + r->ar.end); + damon_for_each_probe(p, ctx) + damon_pa_prep_probes_region(r, p, ctx); + } + } +} + static bool damon_pa_filter_match(struct damon_filter *filter, struct folio *folio) { @@ -448,6 +482,7 @@ static int __init damon_pa_initcall(void) .update = NULL, .prepare_access_checks = damon_pa_prepare_access_checks, .check_accesses = damon_pa_check_accesses, + .prep_probes = damon_pa_prep_probes, .apply_probes = damon_pa_apply_probes, .target_valid = NULL, .apply_scheme = damon_pa_apply_scheme, -- 2.47.3