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 E37443B0AD7; Wed, 8 Jul 2026 01:33:00 +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=1783474384; cv=none; b=bULD1L6WWHIAzSn7alAliALxHrKaEZ6p43rTGnAtjCvcglW5Y3FIO28u9RFo+zvyFLFo0KM+qE6j4hR/AaQN86mylN0rb8OtKyGi+MLBp/scA0WxakcDm2qCpqjUGCO3z85hnobTH+mt/c7Dd0KWsJCs3uQfF+yV2sUy9B6D+RM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783474384; c=relaxed/simple; bh=qYKYHCO4RcHCUA3mkigj1bv0+ZGSaO3rEp77ZWLkW+c=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=HdQ3AqAHZqMUPD8Dj4wurKlddALMIhDpDuqYsnW0qvciRBFDXcM7FmQ8LJOnYP626qR2JGYJcmJYFwdk8FyABCBKCEkH878+7E7+S6eonOj4ezPyUxTGgNlAbjoqXxCc2o7lHEmeEQSpVqvklMOuf7JhBNDU5ypYJO02yizZdN8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=heclTDqe; 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="heclTDqe" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 89AB21F00A3F; Wed, 8 Jul 2026 01:33:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1783474380; bh=kBkRo862BPXwBpQ3hpxe1i0H8YwLqc3ssoJnqfIV6Y0=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=heclTDqelzIekG/623CyypPelqAkSlRKqmiD9kNgKNjZlvl7P3OjN7wp2jZQmXQeN MN8UTOd6OIgoV1Iwoh5f44qXiY+LT4DduN63cmlhLSYRrRhMJti61K+amLF15XtzwN XKgcLDpXvJfeMcsEKqW2TvtUVMFljAooGW1pyLM7JNFVJliBleXVawnwvvIuxEJ+Ul 09kVtdjB/GG1B5u7lOVsH8MAFJQIWlyVKyFKeD0m2G2953uPEurQQAYY1HC/iKLROt d4turGu5ecfBAmkZbw0Y4syBRZBlEmqK5uTqexksn2oT/dLUjrHioPl8u8D2jMkFGO 1F+aCf179RBtQ== 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 v1.2 6/7] mm/damon/core: update probe hits for new parameter commit Date: Tue, 7 Jul 2026 18:32:49 -0700 Message-ID: <20260708013252.95888-7-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260708013252.95888-1-sj@kernel.org> References: <20260708013252.95888-1-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 Users can update DAMON parameters at runtime. If the samples and/or aggregation intervals are updated in this way, monitoring results depending on the intervals should also be updated for a more accurate snapshot. The age and nr_accesses are properly updated, while probe_hits are not updated in the way. Do the update. Signed-off-by: SJ Park --- mm/damon/core.c | 28 +++++++++++++++++++++++++--- mm/damon/tests/core-kunit.h | 13 ++++++++++--- 2 files changed, 35 insertions(+), 6 deletions(-) diff --git a/mm/damon/core.c b/mm/damon/core.c index 800ff6b6d2473..15d31285515d6 100644 --- a/mm/damon/core.c +++ b/mm/damon/core.c @@ -897,10 +897,32 @@ static unsigned int damon_nr_samples_for_new_attrs(unsigned int nr, damon_sample_count_to_bp(nr, old_attrs), new_attrs); } +static void damon_update_probe_hits(struct damon_region *r, + struct damon_attrs *old_attrs, struct damon_attrs *new_attrs, + bool aggregating, struct damon_ctx *ctx) +{ + struct damon_probe *p; + int i = 0; + + damon_for_each_probe(p, ctx) { + r->last_probe_hits[i] = damon_nr_samples_for_new_attrs( + r->last_probe_hits[i], old_attrs, new_attrs); + if (!aggregating) + r->probe_hits[i] = damon_nr_samples_for_new_attrs( + r->probe_hits[i], old_attrs, + new_attrs); + else + r->probe_hits[i] = 0; + i++; + } +} + static void damon_update_monitoring_result(struct damon_region *r, struct damon_attrs *old_attrs, struct damon_attrs *new_attrs, - bool aggregating) + bool aggregating, struct damon_ctx *ctx) { + damon_update_probe_hits(r, old_attrs, new_attrs, aggregating, ctx); + r->last_nr_accesses = damon_nr_samples_for_new_attrs( r->last_nr_accesses, old_attrs, new_attrs); if (!aggregating) @@ -940,8 +962,8 @@ static void damon_update_monitoring_results(struct damon_ctx *ctx, damon_for_each_target(t, ctx) damon_for_each_region(r, t) - damon_update_monitoring_result( - r, old_attrs, new_attrs, aggregating); + damon_update_monitoring_result(r, old_attrs, new_attrs, + aggregating, ctx); } /* diff --git a/mm/damon/tests/core-kunit.h b/mm/damon/tests/core-kunit.h index b2a280556b841..219d02c98624a 100644 --- a/mm/damon/tests/core-kunit.h +++ b/mm/damon/tests/core-kunit.h @@ -597,32 +597,39 @@ static void damon_test_update_monitoring_result(struct kunit *test) .sample_interval = 10, .aggr_interval = 1000,}; struct damon_attrs new_attrs; struct damon_region *r = damon_new_region(3, 7); + struct damon_ctx *ctx; if (!r) kunit_skip(test, "region alloc fail"); + ctx = damon_new_ctx(); + if (!ctx) { + damon_free_region(r); + kunit_skip(test, "ctx alloc fail"); + } r->nr_accesses = 15; r->age = 20; new_attrs = (struct damon_attrs){ .sample_interval = 100, .aggr_interval = 10000,}; - damon_update_monitoring_result(r, &old_attrs, &new_attrs, false); + damon_update_monitoring_result(r, &old_attrs, &new_attrs, false, ctx); KUNIT_EXPECT_EQ(test, r->nr_accesses, 15); KUNIT_EXPECT_EQ(test, r->age, 2); new_attrs = (struct damon_attrs){ .sample_interval = 1, .aggr_interval = 1000}; - damon_update_monitoring_result(r, &old_attrs, &new_attrs, false); + damon_update_monitoring_result(r, &old_attrs, &new_attrs, false, ctx); KUNIT_EXPECT_EQ(test, r->nr_accesses, 150); KUNIT_EXPECT_EQ(test, r->age, 2); new_attrs = (struct damon_attrs){ .sample_interval = 1, .aggr_interval = 100}; - damon_update_monitoring_result(r, &old_attrs, &new_attrs, false); + damon_update_monitoring_result(r, &old_attrs, &new_attrs, false, ctx); KUNIT_EXPECT_EQ(test, r->nr_accesses, 150); KUNIT_EXPECT_EQ(test, r->age, 20); damon_free_region(r); + damon_destroy_ctx(ctx); } static void damon_test_set_attrs(struct kunit *test) -- 2.47.3