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 9026238838F; Tue, 28 Jul 2026 04:12:55 +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=1785211978; cv=none; b=JGPoS+a6l7aIcEOYNkXpCyePpBKe2uRGkpu3a3UB1A9WNRcQlPUTBZ9Ui9PFIMW5pJxgxe54lMi91GJ2quti6bPwYE3CdJRHyqDSoFWYNBsOPubHat4n8RvFGjfo53YTxKdzAh9rGMNuv3dA2zuBGaXNcYRE6UNHsrPpD2rT7nQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785211978; c=relaxed/simple; bh=RlII/+bxZALx45h8wxz+V5lWsOUPfHwlNy6XORJIOTY=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=YTt4TIiTZ8ZqY/4WwrFXVHHBKbR7VvxiaWfifaFhsLVZ6WJFLSx9Il7FoAH0dK10mWRrUBFUHUaNCDJqdQxQrg1aIuNKALHcYZt6sLIB3QXgsUOzLiOFGfXmRQUttOEnaKKevBIe35l7F3Y9f3b30HB4su6YoK7nt7/NJhvFC9I= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=oglScrxw; 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="oglScrxw" Received: by smtp.kernel.org (Postfix) with ESMTPSA id A365C1F00A3D; Tue, 28 Jul 2026 04:12:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1785211974; bh=dLFzt3EcCEm4IM9i5M5f2Ly9bLRqeWPD/3m4Jo0md2U=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=oglScrxwVAH88y6Ax7Ax7nnGkpy9HeysXFQJDjpvqI5IlUIlekaEm1w+D89X0wbo+ 78qaNFDrd5Bu6wYCq2Zo6xQv0qz0BHqSjTGf5CK5q4aHDYIa3Ub766rcZbtMwCqJLD pv4RZcD2mI3Kb2snc/TrF7MDTGBchgaDC7FCgmcLQDV1YIwxnVqTJfl1JBUpYFEk2x Qyxz6tPo6aDHVfPXjC1N1QCPrWtz2fkChF8U0Ky3T0AD7b9Qv4UDAPBv4pjaZmpJR3 r6JvlwMTGkah/JYwA34QKcw6KzXEYLC4ROhNuADZZ4iVBdv9FLFGdZKRoWieN2jn3l 0TkHeM0TtIqUQ== 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 v2.2 08/17] mm/damon/paddr: support damon_prep Date: Mon, 27 Jul 2026 21:12:29 -0700 Message-ID: <20260728041242.187380-9-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260728041242.187380-1-sj@kernel.org> References: <20260728041242.187380-1-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 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