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 63D5D331209 for ; Fri, 31 Jul 2026 02:42:09 +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=1785465730; cv=none; b=OCmu1z1Hi6ccw56eZkuyX9TP0o4K6SYswdLk8SchoHJqt1lvHy0LlGPx1HA1/56BuLwy4qP6nATHaxUCpcY3nNVNDrUqucDh6Wr4XYsmZ0Yu9BN0+C0ZDSuOdALow+GbbQIWSu38NOYCpV3DbVO6VeRW3B20+G942nqYYC3sPs4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785465730; c=relaxed/simple; bh=rGN7VmKjzbVrv6XWeqPJUX8IPxsyB8/6re/Q8tAa6fs=; h=Date:To:From:Subject:Message-Id; b=l/Xlg26CY7mvXGJTg9KgMIrsXlbeV/2LC88pBiEegqPdkhXuSZIx8Jk9p2lwM9BwW3C7FF4UdtzzfhZz5DyuhwMohGdxpmk9Ke4F1n4kt5krL392+VcZc2kNoX0Y59alrKQNonIUfyxkgKhfFSEzNQggQiCZSLQ7D3+Vadclshw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b=r1l+0Dle; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b="r1l+0Dle" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3B3E91F000E9; Fri, 31 Jul 2026 02:42:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=korg; t=1785465729; bh=k/abNN+f4jAozDHbYTMecGQkLqT5SeZHkFShNWpZsxE=; h=Date:To:From:Subject; b=r1l+0DleU6EOV1c9dTn61SD5M8nlO/V9LeY0lI7Ll4yy2RU++g/5fKfUGz/J90cTT ZRxU4Vmf1Y+RNaCuxEmjGLyOcTx/NsGlzOVbD6qDAoCy+MP8puie7og0JQJFUPDqSc fUmimmdql/6Fq2yU51HT9K/PKblt+I6a7dCAwXFk= Date: Thu, 30 Jul 2026 19:42:08 -0700 To: mm-commits@vger.kernel.org,vbabka@kernel.org,surenb@google.com,shuah@kernel.org,rppt@kernel.org,mhocko@suse.com,ljs@kernel.org,liam@infradead.org,david@kernel.org,corbet@lwn.net,brendan.higgins@linux.dev,sj@kernel.org,akpm@linux-foundation.org From: Andrew Morton Subject: [merged mm-stable] mm-damon-core-reduce-range-setup-in-damon_commit_target_regions.patch removed from -mm tree Message-Id: <20260731024209.3B3E91F000E9@smtp.kernel.org> Precedence: bulk X-Mailing-List: mm-commits@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The quilt patch titled Subject: mm/damon/core: reduce range setup in damon_commit_target_regions() has been removed from the -mm tree. Its filename was mm-damon-core-reduce-range-setup-in-damon_commit_target_regions.patch This patch was dropped because it was merged into the mm-stable branch of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm ------------------------------------------------------ From: SJ Park Subject: mm/damon/core: reduce range setup in damon_commit_target_regions() Date: Tue, 30 Jun 2026 07:17:22 -0700 damon_commit_target_regions() calls damon_set_regions() for updating the destination target's monitoring target region boundaries. It sets the boundaries same to source target's monitoring regions, even if they are adjacent. Meanwhile, damon_set_region() sets the destination target regions exactly the same to the source, only when the target regions are empty. When there are existing target regions, only a few regions are expanded or shrunk to fit on only the boundaries for disjoint regions in the source. Hence the adjacent source ranges mean nothing in common cases. When there are many regions, such adjacent range setup is only a waste of time and space. We recently found [1] it is actually causing memory overhead. Setup the ranges for only distinct ranges. Link: https://lore.kernel.org/20260630141726.92246-9-sj@kernel.org Link: https://lore.kernel.org/20260603112306.58490-1-akinobu.mita@gmail.com [1] Signed-off-by: SJ Park Cc: Brendan Higgins Cc: David Hildenbrand Cc: Jonathan Corbet Cc: Liam R. Howlett Cc: Lorenzo Stoakes Cc: Michal Hocko Cc: Mike Rapoport Cc: Shuah Khan Cc: Suren Baghdasaryan Cc: Vlastimil Babka Signed-off-by: Andrew Morton --- mm/damon/core.c | 22 +++++++++++++++++----- 1 file changed, 17 insertions(+), 5 deletions(-) --- a/mm/damon/core.c~mm-damon-core-reduce-range-setup-in-damon_commit_target_regions +++ a/mm/damon/core.c @@ -1360,21 +1360,33 @@ static struct damon_target *damon_nth_ta static int damon_commit_target_regions(struct damon_target *dst, struct damon_target *src, unsigned long src_min_region_sz) { - struct damon_region *src_region; + struct damon_region *src_region, *prev = NULL; struct damon_addr_range *ranges; int i = 0, err; - damon_for_each_region(src_region, src) - i++; + damon_for_each_region(src_region, src) { + if (!prev || prev->ar.end != src_region->ar.start) + i++; + prev = src_region; + } if (!i) return 0; ranges = kvmalloc_objs(*ranges, i, GFP_KERNEL | __GFP_NOWARN); if (!ranges) return -ENOMEM; + prev = NULL; i = 0; - damon_for_each_region(src_region, src) - ranges[i++] = src_region->ar; + damon_for_each_region(src_region, src) { + if (!prev) { + ranges[i].start = src_region->ar.start; + } else if (prev->ar.end != src_region->ar.start) { + ranges[i++].end = prev->ar.end; + ranges[i].start = src_region->ar.start; + } + prev = src_region; + } + ranges[i++].end = damon_last_region(src)->ar.end; err = damon_set_regions(dst, ranges, i, src_min_region_sz); kvfree(ranges); return err; _ Patches currently in -mm which might be from sj@kernel.org are mm-damon-adjust-isolated-pages-stat-for-damos_migrate_hotcold.patch mm-damon-core-stop-ctxs-in-damon_start-before-returning-an-error.patch samples-damon-mtier-do-not-stop-first-context-for-damon_start-failure.patch mm-damon-core-make-damon_stop-never-fails.patch mm-damon-sysfs-ignore-damon_stop-return-value.patch mm-damon-reclaaim-ignore-damon_stop-return-value.patch mm-damon-lru_sort-ignore-damon_stop-return-value.patch mm-damon-core-change-damon_stop-return-type-to-void.patch samples-damon-mtier-stop-all-contexts-with-single-damon_stop-call.patch mm-damon-core-wait-ctx-stop-in-damon_call-before-reruning-an-error.patch samples-damon-wsse-do-not-stop-ctx-for-damon_call-failure.patch samples-damon-prcl-do-not-stop-damon-for-damon_call-failure.patch mm-damon-core-remove-comment-and-test-for-nr_to_bp-divide-by-zero.patch mm-damon-core-s-damon_max_nr_accesses-damon_nr_samples_per_aggr.patch mm-damon-core-s-accesses_bp_to_nr_accesses-sample_bp_to_count.patch mm-damon-core-s-nr_accesses_to_accesses_bp-sample_count_to_bp.patch mm-damon-core-s-nr_accesses_for_new_attrs-nr_samples_for_new_attrs.patch mm-damon-core-update-probe-hits-for-new-parameter-commit.patch mm-damon-core-handle-unreset-probe_hits-in-probe_hits_mvsum.patch mm-damon-core-introduce-damon_probe-weight.patch mm-damon-core-ask-apply_probes-ops-callback-to-set-sampling-address.patch mm-damon-paddr-set-samples-in-apply_probes-if-requested.patch mm-damon-core-ask-apply_probe-to-return-max-probe-hits-weighted-sum.patch mm-damon-core-implement-damon_probe_hits_wsum.patch mm-damon-paddr-respect-return_max_wsum.patch mm-damon-core-use-abs_diff-instead-of-abs.patch mm-damon-core-extend-merge-function-to-work-with-probe-hits.patch mm-damon-core-disallow-probe_hits-overflow-on-attrs-only-monitoring.patch mm-damon-core-validate-params-for-probe-hits-weighted-sum-overflow.patch mm-damon-core-disable-access-monitoring-when-probe-weights-are-set.patch mm-damon-core-set-samples-in-apply_probes-if-probe-weights-are-set.patch mm-damon-core-s-max_nr_accesses-max_merge_score-in-kdamond_fn.patch mm-damon-core-get-merge-threshold-from-probe-hits-when-weights-are-set.patch mm-damon-core-implement-damon_has_probe_weight.patch mm-damon-sysfs-implement-probe-weight-file.patch docs-mm-damon-design-document-attrs-only-monitoring.patch docs-admin-guide-mm-damon-usage-document-weight-sysfs-file.patch docs-abi-damon-document-probe-weight-file.patch mm-damon-core-skip-aging-from-repeated-aggressive-merging.patch mm-damon-core-hide-private-damon_region-fields.patch mm-damon-core-hide-private-damon_target-fields.patch mm-damon-core-hide-private-damos_quota_goal-fields.patch mm-damon-core-hide-private-damos_quota-fields.patch mm-damon-core-hide-private-damos_filter-fields.patch mm-damon-core-hide-private-damos-fields.patch mm-damon-core-hide-private-damon_filter-fields.patch mm-damon-core-hide-private-damon_probe-fields.patch mm-damon-sysfs-do-not-directly-access-damon_ctx-ops.patch mm-damon-core-hide-core-private-damon_ctx-fields.patch mm-damon-core-avoid-infinite-kdamond_merge_regions-internal-loop.patch mm-damon-tests-core-kunit-catch-test-failure-in-test_merge_regions_of.patch mm-damon-vaddr-drop-last-same-folio-access-check-optimization.patch mm-damon-paddr-drop-last-same-folio-access-check-reuse-optimization.patch mm-damon-sysfs-read-addr_unit-only-once-in-damon_sysfs_apply_inputs.patch mm-damon-sysfs-read-ops_id-only-once-in-damon_sysfs_apply_inputs.patch mm-damon-core-initialize-damos-last_applied.patch mm-damon-core-kunit-check-region-count-before-testing-in-split_at.patch mm-damon-vaddr-kunit-check-region-count-in-three_regions-test.patch mm-damon-core-kunit-handle-region-split-failure-in-filter_out.patch mm-damon-core-kunit-skip-wrong-dest-walk-in-commit_dests_for.patch mm-damon-core-kunit-skip-wrong-quota-goal-walk-in-commit_quota_goals.patch mm-damon-core-kunit-skip-wrong-region-walk-in-commit_target_regions.patch mm-damon-ops-common-use-nr_accesses-moving-sum-for-quota-score.patch mm-damon-core-handle-region-split-failure-in-apply_min_nr_regions.patch