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 BB8443D3486; Mon, 27 Jul 2026 14:38:35 +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=1785163117; cv=none; b=Ff0Cp2lQv+omrjGO2C+RQiJGnTS/sMk1scxhI2Q+/4gIMYMogrQvTClG+2DT7E9HM8nq9a41CVMQhPAj5/yzrTNrPnqlqSoEYXLgdjsnkyrk5nsvutYLphaWfT1BK9Iq5uPWvnjCPtoESIVR5TDhNSfJ6sOeoGhXMt7peUTlSyQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785163117; c=relaxed/simple; bh=RlII/+bxZALx45h8wxz+V5lWsOUPfHwlNy6XORJIOTY=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=gpC+o2Lut4d8ax68f+HvF90k4UXorZQbBqK1DK4MAQ3AhoyZC6t9zQRSlEaFlLy9FRAix1oNx0PfCvvF5QN0oVtQ5f2IPYx5ZMb0hDRZRKWeLLud/3IQEs6QOEdSYcNXE7m6RSO+9hT7pYjAQB+eaAOvfG7QtsYPAbtuwmQm8qM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=EplgybDG; 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="EplgybDG" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 39A051F00ACF; Mon, 27 Jul 2026 14:38:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1785163115; bh=dLFzt3EcCEm4IM9i5M5f2Ly9bLRqeWPD/3m4Jo0md2U=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=EplgybDG2pjc7qULp8NAbQU4eO6g01ccQc6WIq6Wsvc3TpeY8z8eRZEHz8VAMw09L CzXyuS7nU4FT6414bVzvUqJuWb5q8XedVv7flNhuaq7VR+FHtpR52LdZkHg1+lDuJr IFZjjTnPqcJ1+DMwgNL9T3RJE45r/PRA40VWywnOxE8l8KW+oszHGih4M4kIS23zxz nWEQWwy2FhGoftMh8NfH7ia1zCK4/uTgbtJazAGHyUZOJ0cF0aoJAsF0G2Pi1Xulx/ mMqo9Kq4zT4XQDXfP5zkjE2NJ69td7ShaQz0A4mCJ7kMueJBsPbMyq7Rho0siOnGLN 5W6IaRYF2GnUg== 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 v2.1 08/17] mm/damon/paddr: support damon_prep Date: Mon, 27 Jul 2026 07:38:17 -0700 Message-ID: <20260727143829.86236-9-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260727143829.86236-1-sj@kernel.org> References: <20260727143829.86236-1-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 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 5b307dcbb2a50..8fb71183b76c0 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