[RFC PATCH 00/10] mm/damon: let DAMON be paused and resumed
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SeongJae Park
Mar 15, 2026, 5:00:24 PMMar 15
to SeongJae Park, Liam R. Howlett, Andrew Morton, Brendan Higgins, David Gow, David Hildenbrand, Jonathan Corbet, Lorenzo Stoakes, Michal Hocko, Mike Rapoport, Shuah Khan, Shuah Khan, Suren Baghdasaryan, Vlastimil Babka, da...@lists.linux.dev, kuni...@googlegroups.com, linu...@vger.kernel.org, linux-...@vger.kernel.org, linux-k...@vger.kernel.org, linu...@kvack.org
DAMON utilizes a few mechanisms that enhance itself over time. Adaptive
regions adjustment, goal-based DAMOS quota auto-tuning and monitoring
intervals auto-tuning like self-training mechanisms are such examples.
It also adds access frequency stability information (age) to the
monitoring results, which makes it enhanced over time.
Sometimes users have to stop DAMON. In this case, DAMON internal state
that enhanced over the time of the last execution simply goes away.
Restarted DAMON have to train itself and enhance its output from the
scratch. This makes DAMON less useful in such cases. Introducing three
such use cases below.
Investigation of DAMON. It is best to do the investigation online,
especially when it is a production environment. DAMON therefore
provides features for such online investigations, including DAMOS stats,
monitoring result snapshot exposure, and multiple tracepoints. When
those are insufficient, and there are additional clues that could be
interfered by DAMON, users have to temporarily stop DAMON to collect the
additional clues. It is not very useful since many of DAMON internal
clues are gone when DAMON is stopped. The loss of the monitoring
results that improved over time is also problematic, especially in
production environments.
Monitoring of workloads that have different user-known phases. For
example, in Android, applications are known to have very different
access patterns and behaviors when they are running on the foreground
and the background. It can therefore be useful to separate monitoring
of apps based on whether they are running on the foreground and on the
background. Having two DAMON threads per application that paused and
resumed for the apps foreground/background switches can be useful for
the purpose. But such pause/resume of the execution is not supported.
Tests of DAMON. A few DAMON selftests are using drgn to dump the
internal DAMON status. The tests show if the dumped status is the same
as what the test code expected. Because DAMON keeps running and
modifying its internal status, there are chances of data races that can
cause false test results. Stopping DAMON can avoid the race. But,
since the internal state of DAMON is dropped, the test coverage will be
limited.
Let DAMON execution be paused and resumed without loss of the internal
state, to overhaul the limitations. For this, introduce a new DAMON
context parameter, namely 'pause'. API callers can update it while the
context is running, using the online parameters update functions
(damon_commit_ctx() and damon_call()). Once it is set, kdamond_fn()
main loop will do only limited works excluding the monitoring and DAMOS
works, while sleeping sampling intervals per the work. The limited
works include handling of the online parameters update. Hence users can
unset the 'pause' parameter again. Once it is unset, kdamond_fn() main
loop will do all the work again (resumed). Under the paused state, it
also does stop condition checks and handling of it, so that paused DAMON
can also be stopped if needed. Expose the feature to the user space via
DAMON sysfs interface. Also, update existing drgn-based tests to test
and use the feature.
Tests
=====
I confirmed the feature functionality using real time tracing ('perf
trace' or 'trace-cmd stream') of damon:damon_aggregated DAMON
tracepoint. By pausing and resuming the DAMON execution, I was able to
see the trace stops and continued as expected. Note that the pause
feature support is added to DAMON user-space tool (damo) after v3.1.9.
Users can use '--pause_ctx' command line option of damo for that, and I
actually used it for my test. The extended drgn-based selftests are
also testing a part of the functionality.
Patches Sequence
================
Patch 1 introduces the new core API for the pause feature. Patch 2
extend DAMON sysfs interface for the new parameter. Patches 3-5 update
design, usage and ABI documents for the new sysfs file, respectively.
The following five patches are for tests. Patch 6 implements a new
kunit test for the pause parameter online commitment. Patches 7 and 8
extend DAMON selftest helpers to support the new feature. Patch 9
extends selftest to test the commitment of the feature. Finally, patch
10 updates existing selftest to be safe from the race condition using
the pause/resume feature.
SeongJae Park (10):
mm/damon/core: introduce damon_ctx->paused
mm/damon/sysfs: add pause file under context dir
Docs/mm/damon/design: update for context pause/resume feature
Docs/admin-guide/mm/damon/usage: update for pause file
Docs/ABI/damon: update for pause sysfs file
mm/damon/tests/core-kunit: test pause commitment
selftests/damon/_damon_sysfs: support pause file staging
selftests/damon/drgn_dump_damon_status: dump pause
selftests/damon/sysfs.py: check pause on assert_ctx_committed()
selftets/damon/sysfs.py: pause DAMON before dumping status
.../ABI/testing/sysfs-kernel-mm-damon | 7 +++++
Documentation/admin-guide/mm/damon/usage.rst | 12 +++++---
Documentation/mm/damon/design.rst | 7 +++++
include/linux/damon.h | 2 ++
mm/damon/core.c | 8 +++++
mm/damon/sysfs.c | 30 +++++++++++++++++++
mm/damon/tests/core-kunit.h | 4 +++
tools/testing/selftests/damon/_damon_sysfs.py | 10 ++++++-
.../selftests/damon/drgn_dump_damon_status.py | 1 +
tools/testing/selftests/damon/sysfs.py | 28 +++++++++++++++++
10 files changed, 104 insertions(+), 5 deletions(-)
base-commit: 027cb70b08db6e3df632c49a8c7590ea830f7a96
--
2.47.3
regions adjustment, goal-based DAMOS quota auto-tuning and monitoring
intervals auto-tuning like self-training mechanisms are such examples.
It also adds access frequency stability information (age) to the
monitoring results, which makes it enhanced over time.
Sometimes users have to stop DAMON. In this case, DAMON internal state
that enhanced over the time of the last execution simply goes away.
Restarted DAMON have to train itself and enhance its output from the
scratch. This makes DAMON less useful in such cases. Introducing three
such use cases below.
Investigation of DAMON. It is best to do the investigation online,
especially when it is a production environment. DAMON therefore
provides features for such online investigations, including DAMOS stats,
monitoring result snapshot exposure, and multiple tracepoints. When
those are insufficient, and there are additional clues that could be
interfered by DAMON, users have to temporarily stop DAMON to collect the
additional clues. It is not very useful since many of DAMON internal
clues are gone when DAMON is stopped. The loss of the monitoring
results that improved over time is also problematic, especially in
production environments.
Monitoring of workloads that have different user-known phases. For
example, in Android, applications are known to have very different
access patterns and behaviors when they are running on the foreground
and the background. It can therefore be useful to separate monitoring
of apps based on whether they are running on the foreground and on the
background. Having two DAMON threads per application that paused and
resumed for the apps foreground/background switches can be useful for
the purpose. But such pause/resume of the execution is not supported.
Tests of DAMON. A few DAMON selftests are using drgn to dump the
internal DAMON status. The tests show if the dumped status is the same
as what the test code expected. Because DAMON keeps running and
modifying its internal status, there are chances of data races that can
cause false test results. Stopping DAMON can avoid the race. But,
since the internal state of DAMON is dropped, the test coverage will be
limited.
Let DAMON execution be paused and resumed without loss of the internal
state, to overhaul the limitations. For this, introduce a new DAMON
context parameter, namely 'pause'. API callers can update it while the
context is running, using the online parameters update functions
(damon_commit_ctx() and damon_call()). Once it is set, kdamond_fn()
main loop will do only limited works excluding the monitoring and DAMOS
works, while sleeping sampling intervals per the work. The limited
works include handling of the online parameters update. Hence users can
unset the 'pause' parameter again. Once it is unset, kdamond_fn() main
loop will do all the work again (resumed). Under the paused state, it
also does stop condition checks and handling of it, so that paused DAMON
can also be stopped if needed. Expose the feature to the user space via
DAMON sysfs interface. Also, update existing drgn-based tests to test
and use the feature.
Tests
=====
I confirmed the feature functionality using real time tracing ('perf
trace' or 'trace-cmd stream') of damon:damon_aggregated DAMON
tracepoint. By pausing and resuming the DAMON execution, I was able to
see the trace stops and continued as expected. Note that the pause
feature support is added to DAMON user-space tool (damo) after v3.1.9.
Users can use '--pause_ctx' command line option of damo for that, and I
actually used it for my test. The extended drgn-based selftests are
also testing a part of the functionality.
Patches Sequence
================
Patch 1 introduces the new core API for the pause feature. Patch 2
extend DAMON sysfs interface for the new parameter. Patches 3-5 update
design, usage and ABI documents for the new sysfs file, respectively.
The following five patches are for tests. Patch 6 implements a new
kunit test for the pause parameter online commitment. Patches 7 and 8
extend DAMON selftest helpers to support the new feature. Patch 9
extends selftest to test the commitment of the feature. Finally, patch
10 updates existing selftest to be safe from the race condition using
the pause/resume feature.
SeongJae Park (10):
mm/damon/core: introduce damon_ctx->paused
mm/damon/sysfs: add pause file under context dir
Docs/mm/damon/design: update for context pause/resume feature
Docs/admin-guide/mm/damon/usage: update for pause file
Docs/ABI/damon: update for pause sysfs file
mm/damon/tests/core-kunit: test pause commitment
selftests/damon/_damon_sysfs: support pause file staging
selftests/damon/drgn_dump_damon_status: dump pause
selftests/damon/sysfs.py: check pause on assert_ctx_committed()
selftets/damon/sysfs.py: pause DAMON before dumping status
.../ABI/testing/sysfs-kernel-mm-damon | 7 +++++
Documentation/admin-guide/mm/damon/usage.rst | 12 +++++---
Documentation/mm/damon/design.rst | 7 +++++
include/linux/damon.h | 2 ++
mm/damon/core.c | 8 +++++
mm/damon/sysfs.c | 30 +++++++++++++++++++
mm/damon/tests/core-kunit.h | 4 +++
tools/testing/selftests/damon/_damon_sysfs.py | 10 ++++++-
.../selftests/damon/drgn_dump_damon_status.py | 1 +
tools/testing/selftests/damon/sysfs.py | 28 +++++++++++++++++
10 files changed, 104 insertions(+), 5 deletions(-)
base-commit: 027cb70b08db6e3df632c49a8c7590ea830f7a96
--
2.47.3
SeongJae Park
Mar 15, 2026, 5:00:26 PMMar 15
to SeongJae Park, Andrew Morton, Brendan Higgins, David Gow, da...@lists.linux.dev, kuni...@googlegroups.com, linux-...@vger.kernel.org, linux-k...@vger.kernel.org, linu...@kvack.org
Add a kunit test for commitment of damon_ctx->pause parameter that can
be done using damon_commit_ctx().
Signed-off-by: SeongJae Park <s...@kernel.org>
---
mm/damon/tests/core-kunit.h | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/mm/damon/tests/core-kunit.h b/mm/damon/tests/core-kunit.h
index 9e5904c2beeb2..0030f682b23b7 100644
--- a/mm/damon/tests/core-kunit.h
+++ b/mm/damon/tests/core-kunit.h
@@ -1077,6 +1077,10 @@ static void damon_test_commit_ctx(struct kunit *test)
KUNIT_EXPECT_EQ(test, damon_commit_ctx(dst, src), 0);
src->min_region_sz = 4095;
KUNIT_EXPECT_EQ(test, damon_commit_ctx(dst, src), -EINVAL);
+ src->min_region_sz = 4096;
+ src->pause = true;
+ KUNIT_EXPECT_EQ(test, damon_commit_ctx(dst, src), 0);
+ KUNIT_EXPECT_TRUE(test, dst->pause);
damon_destroy_ctx(src);
damon_destroy_ctx(dst);
}
--
2.47.3
be done using damon_commit_ctx().
Signed-off-by: SeongJae Park <s...@kernel.org>
---
mm/damon/tests/core-kunit.h | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/mm/damon/tests/core-kunit.h b/mm/damon/tests/core-kunit.h
index 9e5904c2beeb2..0030f682b23b7 100644
--- a/mm/damon/tests/core-kunit.h
+++ b/mm/damon/tests/core-kunit.h
@@ -1077,6 +1077,10 @@ static void damon_test_commit_ctx(struct kunit *test)
KUNIT_EXPECT_EQ(test, damon_commit_ctx(dst, src), 0);
src->min_region_sz = 4095;
KUNIT_EXPECT_EQ(test, damon_commit_ctx(dst, src), -EINVAL);
+ src->min_region_sz = 4096;
+ src->pause = true;
+ KUNIT_EXPECT_EQ(test, damon_commit_ctx(dst, src), 0);
+ KUNIT_EXPECT_TRUE(test, dst->pause);
damon_destroy_ctx(src);
damon_destroy_ctx(dst);
}
--
2.47.3
SeongJae Park
Mar 19, 2026, 1:22:09 AMMar 19
to SeongJae Park, Liam R. Howlett, Andrew Morton, Brendan Higgins, David Gow, David Hildenbrand, Jonathan Corbet, Lorenzo Stoakes, Michal Hocko, Mike Rapoport, Shuah Khan, Shuah Khan, Suren Baghdasaryan, Vlastimil Babka, da...@lists.linux.dev, kuni...@googlegroups.com, linu...@vger.kernel.org, linux-...@vger.kernel.org, linux-k...@vger.kernel.org, linu...@kvack.org
=========
Changes from RFC v1
(https://lore.kernel.org/202603152100...@kernel.org)
- Continuously cancel new damos_walk() requests when paused.
- Initialize damon_sysfs_context->pause.
- Make sysfs.py dump-purpose pausing to work for all contexts.
SeongJae Park (10):
mm/damon/core: introduce damon_ctx->paused
mm/damon/sysfs: add pause file under context dir
Docs/mm/damon/design: update for context pause/resume feature
Docs/admin-guide/mm/damon/usage: update for pause file
Docs/ABI/damon: update for pause sysfs file
mm/damon/tests/core-kunit: test pause commitment
selftests/damon/_damon_sysfs: support pause file staging
selftests/damon/drgn_dump_damon_status: dump pause
selftests/damon/sysfs.py: check pause on assert_ctx_committed()
selftets/damon/sysfs.py: pause DAMON before dumping status
.../ABI/testing/sysfs-kernel-mm-damon | 7 ++++
Documentation/mm/damon/design.rst | 7 ++++
include/linux/damon.h | 2 ++
mm/damon/core.c | 9 ++++++
mm/damon/sysfs.c | 31 ++++++++++++++++++
mm/damon/tests/core-kunit.h | 4 +++
tools/testing/selftests/damon/_damon_sysfs.py | 10 +++++-
.../selftests/damon/drgn_dump_damon_status.py | 1 +
tools/testing/selftests/damon/sysfs.py | 32 +++++++++++++++++++
10 files changed, 110 insertions(+), 5 deletions(-)
base-commit: 89fea69e3a636d7f4c7a0dee9c25e2b417a74c7a
--
2.47.3
SeongJae Park
Mar 19, 2026, 1:22:10 AMMar 19
to SeongJae Park, Andrew Morton, Brendan Higgins, David Gow, da...@lists.linux.dev, kuni...@googlegroups.com, linux-...@vger.kernel.org, linux-k...@vger.kernel.org, linu...@kvack.org
SeongJae Park
Mar 21, 2026, 2:13:54 PMMar 21
to Andrew Morton, SeongJae Park, Liam R. Howlett, Brendan Higgins, David Gow, David Hildenbrand, Jonathan Corbet, Lorenzo Stoakes, Michal Hocko, Mike Rapoport, Shuah Khan, Shuah Khan, Suren Baghdasaryan, Vlastimil Babka, da...@lists.linux.dev, kuni...@googlegroups.com, linu...@vger.kernel.org, linux-...@vger.kernel.org, linux-k...@vger.kernel.org, linu...@kvack.org
(https://lore.kernel.org/202603190521...@kernel.org)
- Move damon_ctx->pause to public fields section.
- Wordsmith design doc change.
- Fix unintended resume of contexts in multiple contexts use case.
- Rebase to latest mm-new.
Changes from RFC v1
(https://lore.kernel.org/202603152100...@kernel.org)
- Continuously cancel new damos_walk() requests when paused.
- Initialize damon_sysfs_context->pause.
- Make sysfs.py dump-purpose pausing to work for all contexts.
SeongJae Park (10):
mm/damon/core: introduce damon_ctx->paused
mm/damon/sysfs: add pause file under context dir
Docs/mm/damon/design: update for context pause/resume feature
Docs/admin-guide/mm/damon/usage: update for pause file
Docs/ABI/damon: update for pause sysfs file
mm/damon/tests/core-kunit: test pause commitment
selftests/damon/_damon_sysfs: support pause file staging
selftests/damon/drgn_dump_damon_status: dump pause
selftests/damon/sysfs.py: check pause on assert_ctx_committed()
selftets/damon/sysfs.py: pause DAMON before dumping status
.../ABI/testing/sysfs-kernel-mm-damon | 7 ++++
Documentation/admin-guide/mm/damon/usage.rst | 12 ++++--
(https://lore.kernel.org/202603152100...@kernel.org)
- Continuously cancel new damos_walk() requests when paused.
- Initialize damon_sysfs_context->pause.
- Make sysfs.py dump-purpose pausing to work for all contexts.
SeongJae Park (10):
mm/damon/core: introduce damon_ctx->paused
mm/damon/sysfs: add pause file under context dir
Docs/mm/damon/design: update for context pause/resume feature
Docs/admin-guide/mm/damon/usage: update for pause file
Docs/ABI/damon: update for pause sysfs file
mm/damon/tests/core-kunit: test pause commitment
selftests/damon/_damon_sysfs: support pause file staging
selftests/damon/drgn_dump_damon_status: dump pause
selftests/damon/sysfs.py: check pause on assert_ctx_committed()
selftets/damon/sysfs.py: pause DAMON before dumping status
.../ABI/testing/sysfs-kernel-mm-damon | 7 ++++
Documentation/admin-guide/mm/damon/usage.rst | 12 ++++--
Documentation/mm/damon/design.rst | 7 ++++
include/linux/damon.h | 2 +
mm/damon/core.c | 9 +++++
include/linux/damon.h | 2 +
mm/damon/sysfs.c | 31 ++++++++++++++++
mm/damon/tests/core-kunit.h | 4 ++
tools/testing/selftests/damon/_damon_sysfs.py | 10 ++++-
.../selftests/damon/drgn_dump_damon_status.py | 1 +
tools/testing/selftests/damon/sysfs.py | 37 +++++++++++++++++++
10 files changed, 115 insertions(+), 5 deletions(-)
base-commit: 7580a23dc3d9af23b4911f9cc1d9da2f519d63a5
--
2.47.3
SeongJae Park
Mar 21, 2026, 2:13:56 PMMar 21
to Andrew Morton, SeongJae Park, Brendan Higgins, David Gow, da...@lists.linux.dev, kuni...@googlegroups.com, linux-...@vger.kernel.org, linux-k...@vger.kernel.org, linu...@kvack.org
SeongJae Park
Mar 21, 2026, 4:07:32 PMMar 21
to SeongJae Park, Andrew Morton, Liam R. Howlett, Brendan Higgins, David Gow, David Hildenbrand, Jonathan Corbet, Lorenzo Stoakes, Michal Hocko, Mike Rapoport, Shuah Khan, Shuah Khan, Suren Baghdasaryan, Vlastimil Babka, da...@lists.linux.dev, kuni...@googlegroups.com, linu...@vger.kernel.org, linux-...@vger.kernel.org, linux-k...@vger.kernel.org, linu...@kvack.org
Forwarding sashiko.dev review status for this thread.
# review url: https://sashiko.dev/#/patchset/202603211813...@kernel.org
- [PATCH 01/10] mm/damon/core: introduce damon_ctx->paused
- status: Reviewed
- [PATCH 02/10] mm/damon/sysfs: add pause file under context dir
- status: Reviewed
- review: No issues found.
- [PATCH 03/10] Docs/mm/damon/design: update for context pause/resume feature
- status: Reviewed
- review: No issues found.
- [PATCH 04/10] Docs/admin-guide/mm/damon/usage: update for pause file
- status: Reviewed
- review: No issues found.
- [PATCH 05/10] Docs/ABI/damon: update for pause sysfs file
- status: Reviewed
- review: No issues found.
- [PATCH 06/10] mm/damon/tests/core-kunit: test pause commitment
- status: Reviewed
- review: No issues found.
- [PATCH 07/10] selftests/damon/_damon_sysfs: support pause file staging
- status: Reviewed
- review: No issues found.
- [PATCH 08/10] selftests/damon/drgn_dump_damon_status: dump pause
- status: Reviewed
- review: No issues found.
- [PATCH 09/10] selftests/damon/sysfs.py: check pause on assert_ctx_committed()
- status: Reviewed
- review: No issues found.
- [PATCH 10/10] selftets/damon/sysfs.py: pause DAMON before dumping status
- status: Reviewed
# hkml [1] generated a draft of this mail. It can be regenerated
# using below command:
#
# hkml patch sashiko_dev --thread_status --for_forwarding \
# 202603211813...@kernel.org
#
# [1] https://github.com/sjp38/hackermail
# review url: https://sashiko.dev/#/patchset/202603211813...@kernel.org
- [PATCH 01/10] mm/damon/core: introduce damon_ctx->paused
- status: Reviewed
- [PATCH 02/10] mm/damon/sysfs: add pause file under context dir
- status: Reviewed
- review: No issues found.
- [PATCH 03/10] Docs/mm/damon/design: update for context pause/resume feature
- status: Reviewed
- review: No issues found.
- [PATCH 04/10] Docs/admin-guide/mm/damon/usage: update for pause file
- status: Reviewed
- review: No issues found.
- [PATCH 05/10] Docs/ABI/damon: update for pause sysfs file
- status: Reviewed
- review: No issues found.
- [PATCH 06/10] mm/damon/tests/core-kunit: test pause commitment
- status: Reviewed
- review: No issues found.
- [PATCH 07/10] selftests/damon/_damon_sysfs: support pause file staging
- status: Reviewed
- review: No issues found.
- [PATCH 08/10] selftests/damon/drgn_dump_damon_status: dump pause
- status: Reviewed
- review: No issues found.
- [PATCH 09/10] selftests/damon/sysfs.py: check pause on assert_ctx_committed()
- status: Reviewed
- review: No issues found.
- [PATCH 10/10] selftets/damon/sysfs.py: pause DAMON before dumping status
- status: Reviewed
# hkml [1] generated a draft of this mail. It can be regenerated
# using below command:
#
# hkml patch sashiko_dev --thread_status --for_forwarding \
# 202603211813...@kernel.org
#
# [1] https://github.com/sjp38/hackermail
SeongJae Park
Mar 22, 2026, 11:57:39 AMMar 22
to SeongJae Park, Liam R. Howlett, Andrew Morton, Brendan Higgins, David Gow, David Hildenbrand, Jonathan Corbet, Lorenzo Stoakes, Michal Hocko, Mike Rapoport, Shuah Khan, Shuah Khan, Suren Baghdasaryan, Vlastimil Babka, da...@lists.linux.dev, kuni...@googlegroups.com, linu...@vger.kernel.org, linux-...@vger.kernel.org, linux-k...@vger.kernel.org, linu...@kvack.org
(https://lore.kernel.org/202603211813...@kernel.org)
- Add RFC tag again.
- Handle maybe_corrupted inside pause-loop.
- Reduce unnecessary commits in sysfs.py selftest.
Changes from RFC v2
(https://lore.kernel.org/202603190521...@kernel.org)
- Move damon_ctx->pause to public fields section.
- Wordsmith design doc change.
- Fix unintended resume of contexts in multiple contexts use case.
- Rebase to latest mm-new.
Changes from RFC v1
(https://lore.kernel.org/202603152100...@kernel.org)
- Continuously cancel new damos_walk() requests when paused.
- Initialize damon_sysfs_context->pause.
- Make sysfs.py dump-purpose pausing to work for all contexts.
SeongJae Park (10):
mm/damon/core: introduce damon_ctx->paused
(https://lore.kernel.org/202603190521...@kernel.org)
- Move damon_ctx->pause to public fields section.
- Wordsmith design doc change.
- Fix unintended resume of contexts in multiple contexts use case.
- Rebase to latest mm-new.
Changes from RFC v1
(https://lore.kernel.org/202603152100...@kernel.org)
- Continuously cancel new damos_walk() requests when paused.
- Initialize damon_sysfs_context->pause.
- Make sysfs.py dump-purpose pausing to work for all contexts.
SeongJae Park (10):
mm/damon/core: introduce damon_ctx->paused
mm/damon/sysfs: add pause file under context dir
Docs/mm/damon/design: update for context pause/resume feature
Docs/admin-guide/mm/damon/usage: update for pause file
Docs/ABI/damon: update for pause sysfs file
mm/damon/tests/core-kunit: test pause commitment
selftests/damon/_damon_sysfs: support pause file staging
selftests/damon/drgn_dump_damon_status: dump pause
selftests/damon/sysfs.py: check pause on assert_ctx_committed()
selftets/damon/sysfs.py: pause DAMON before dumping status
.../ABI/testing/sysfs-kernel-mm-damon | 7 ++++
Documentation/admin-guide/mm/damon/usage.rst | 12 ++++--
Documentation/mm/damon/design.rst | 7 ++++
include/linux/damon.h | 2 +
mm/damon/core.c | 9 +++++
mm/damon/sysfs.c | 31 +++++++++++++++
Documentation/admin-guide/mm/damon/usage.rst | 12 ++++--
Documentation/mm/damon/design.rst | 7 ++++
include/linux/damon.h | 2 +
mm/damon/core.c | 9 +++++
mm/damon/sysfs.c | 31 +++++++++++++++
mm/damon/tests/core-kunit.h | 4 ++
tools/testing/selftests/damon/_damon_sysfs.py | 10 ++++-
.../selftests/damon/drgn_dump_damon_status.py | 1 +
tools/testing/selftests/damon/sysfs.py | 39 +++++++++++++++++++
tools/testing/selftests/damon/_damon_sysfs.py | 10 ++++-
.../selftests/damon/drgn_dump_damon_status.py | 1 +
10 files changed, 117 insertions(+), 5 deletions(-)
base-commit: 73b971e012fbe1b2e8cd4992602898d5c9633ca4
--
2.47.3
SeongJae Park
Mar 22, 2026, 11:57:41 AMMar 22
to SeongJae Park, Andrew Morton, Brendan Higgins, David Gow, da...@lists.linux.dev, kuni...@googlegroups.com, linux-...@vger.kernel.org, linux-k...@vger.kernel.org, linu...@kvack.org
SeongJae Park
Mar 22, 2026, 1:05:14 PMMar 22
to SeongJae Park, Liam R. Howlett, Andrew Morton, Brendan Higgins, David Gow, David Hildenbrand, Jonathan Corbet, Lorenzo Stoakes, Michal Hocko, Mike Rapoport, Shuah Khan, Shuah Khan, Suren Baghdasaryan, Vlastimil Babka, da...@lists.linux.dev, kuni...@googlegroups.com, linu...@vger.kernel.org, linux-...@vger.kernel.org, linux-k...@vger.kernel.org, linu...@kvack.org
# review url: https://sashiko.dev/#/patchset/202603221557...@kernel.org
- [RFC PATCH v4 01/10] mm/damon/core: introduce damon_ctx->paused
- status: Reviewed
- review: ISSUES MAY FOUND
- [RFC PATCH v4 02/10] mm/damon/sysfs: add pause file under context dir
- status: Pending
- review: ISSUES MAY FOUND
- [RFC PATCH v4 08/10] selftests/damon/drgn_dump_damon_status: dump pause
- status: Reviewed
- review: ISSUES MAY FOUND
# hkml [1] generated a draft of this mail. It can be regenerated
# using below command:
#
# hkml patch sashiko_dev --thread_status --for_forwarding \
# 202603221557...@kernel.org
Sent using hkml (https://github.com/sjp38/hackermail)
- [RFC PATCH v4 01/10] mm/damon/core: introduce damon_ctx->paused
- status: Reviewed
- review: ISSUES MAY FOUND
- [RFC PATCH v4 02/10] mm/damon/sysfs: add pause file under context dir
- status: Reviewed
- review: No issues found.
- [RFC PATCH v4 03/10] Docs/mm/damon/design: update for context pause/resume feature
- review: No issues found.
- status: Reviewed
- review: No issues found.
- [RFC PATCH v4 04/10] Docs/admin-guide/mm/damon/usage: update for pause file
- review: No issues found.
- status: Reviewed
- review: No issues found.
- [RFC PATCH v4 05/10] Docs/ABI/damon: update for pause sysfs file
- review: No issues found.
- status: Reviewed
- review: No issues found.
- [RFC PATCH v4 06/10] mm/damon/tests/core-kunit: test pause commitment
- review: No issues found.
- status: Reviewed
- review: No issues found.
- [RFC PATCH v4 07/10] selftests/damon/_damon_sysfs: support pause file staging
- review: No issues found.
- status: Pending
- review: ISSUES MAY FOUND
- [RFC PATCH v4 08/10] selftests/damon/drgn_dump_damon_status: dump pause
- status: Reviewed
- review: No issues found.
- [RFC PATCH v4 09/10] selftests/damon/sysfs.py: check pause on assert_ctx_committed()
- review: No issues found.
- status: Reviewed
- review: No issues found.
- [RFC PATCH v4 10/10] selftets/damon/sysfs.py: pause DAMON before dumping status
- review: No issues found.
- status: Reviewed
- review: ISSUES MAY FOUND
# hkml [1] generated a draft of this mail. It can be regenerated
# using below command:
#
# hkml patch sashiko_dev --thread_status --for_forwarding \
Sent using hkml (https://github.com/sjp38/hackermail)
SeongJae Park
Mar 22, 2026, 1:11:24 PMMar 22
to SeongJae Park, Liam R. Howlett, Andrew Morton, Brendan Higgins, David Gow, David Hildenbrand, Jonathan Corbet, Lorenzo Stoakes, Michal Hocko, Mike Rapoport, Shuah Khan, Shuah Khan, Suren Baghdasaryan, Vlastimil Babka, da...@lists.linux.dev, kuni...@googlegroups.com, linu...@vger.kernel.org, linux-...@vger.kernel.org, linux-k...@vger.kernel.org, linu...@kvack.org
On Sun, 22 Mar 2026 10:05:05 -0700 SeongJae Park <s...@kernel.org> wrote:
> Forwarding sashiko.dev review status for this thread.
>
> # review url: https://sashiko.dev/#/patchset/202603221557...@kernel.org
>
> - [RFC PATCH v4 01/10] mm/damon/core: introduce damon_ctx->paused
> - status: Reviewed
> - review: ISSUES MAY FOUND
> - [RFC PATCH v4 02/10] mm/damon/sysfs: add pause file under context dir
> - status: Reviewed
> - review: No issues found.
> - [RFC PATCH v4 03/10] Docs/mm/damon/design: update for context pause/resume feature
> - status: Reviewed
> - review: No issues found.
> - [RFC PATCH v4 04/10] Docs/admin-guide/mm/damon/usage: update for pause file
> - status: Reviewed
> - review: No issues found.
> - [RFC PATCH v4 05/10] Docs/ABI/damon: update for pause sysfs file
> - status: Reviewed
> - review: No issues found.
> - [RFC PATCH v4 06/10] mm/damon/tests/core-kunit: test pause commitment
> - status: Reviewed
> - review: No issues found.
> - [RFC PATCH v4 07/10] selftests/damon/_damon_sysfs: support pause file staging
> - status: Pending
> - review: ISSUES MAY FOUND
The status is pending. 'ISSUES MAY FOUND' is a bug of hkml. I'm fixing it.
> Forwarding sashiko.dev review status for this thread.
>
> # review url: https://sashiko.dev/#/patchset/202603221557...@kernel.org
>
> - [RFC PATCH v4 01/10] mm/damon/core: introduce damon_ctx->paused
> - status: Reviewed
> - review: ISSUES MAY FOUND
> - [RFC PATCH v4 02/10] mm/damon/sysfs: add pause file under context dir
> - status: Reviewed
> - review: No issues found.
> - [RFC PATCH v4 03/10] Docs/mm/damon/design: update for context pause/resume feature
> - status: Reviewed
> - review: No issues found.
> - [RFC PATCH v4 04/10] Docs/admin-guide/mm/damon/usage: update for pause file
> - status: Reviewed
> - review: No issues found.
> - [RFC PATCH v4 05/10] Docs/ABI/damon: update for pause sysfs file
> - status: Reviewed
> - review: No issues found.
> - [RFC PATCH v4 06/10] mm/damon/tests/core-kunit: test pause commitment
> - status: Reviewed
> - review: No issues found.
> - [RFC PATCH v4 07/10] selftests/damon/_damon_sysfs: support pause file staging
> - status: Pending
> - review: ISSUES MAY FOUND
Thanks,
SJ
[...]
SeongJae Park
Mar 23, 2026, 7:15:45 PMMar 23
to SeongJae Park, Liam R. Howlett, Andrew Morton, Brendan Higgins, David Gow, David Hildenbrand, Jonathan Corbet, Lorenzo Stoakes, Michal Hocko, Mike Rapoport, Shuah Khan, Shuah Khan, Suren Baghdasaryan, Vlastimil Babka, da...@lists.linux.dev, kuni...@googlegroups.com, linu...@vger.kernel.org, linux-...@vger.kernel.org, linux-k...@vger.kernel.org, linu...@kvack.org
(https://lore.kerneel.org/202603221557...@kernel.org)
- Fix typo: selftets.
- Fix wrong selftests kdamonds resume iteration.
Changes from v1 (or, RFC v3)
(https://lore.kernel.org/202603211813...@kernel.org)
- Add RFC tag again.
- Handle maybe_corrupted inside pause-loop.
- Reduce unnecessary commits in sysfs.py selftest.
Changes from RFC v2
(https://lore.kernel.org/202603190521...@kernel.org)
- Move damon_ctx->pause to public fields section.
- Wordsmith design doc change.
- Fix unintended resume of contexts in multiple contexts use case.
- Rebase to latest mm-new.
Changes from RFC v1
(https://lore.kernel.org/202603152100...@kernel.org)
- Continuously cancel new damos_walk() requests when paused.
- Initialize damon_sysfs_context->pause.
- Make sysfs.py dump-purpose pausing to work for all contexts.
SeongJae Park (10):
mm/damon/core: introduce damon_ctx->paused
(https://lore.kernel.org/202603211813...@kernel.org)
- Add RFC tag again.
- Handle maybe_corrupted inside pause-loop.
- Reduce unnecessary commits in sysfs.py selftest.
Changes from RFC v2
(https://lore.kernel.org/202603190521...@kernel.org)
- Move damon_ctx->pause to public fields section.
- Wordsmith design doc change.
- Fix unintended resume of contexts in multiple contexts use case.
- Rebase to latest mm-new.
Changes from RFC v1
(https://lore.kernel.org/202603152100...@kernel.org)
- Continuously cancel new damos_walk() requests when paused.
- Initialize damon_sysfs_context->pause.
- Make sysfs.py dump-purpose pausing to work for all contexts.
SeongJae Park (10):
mm/damon/core: introduce damon_ctx->paused
mm/damon/sysfs: add pause file under context dir
Docs/mm/damon/design: update for context pause/resume feature
Docs/admin-guide/mm/damon/usage: update for pause file
Docs/ABI/damon: update for pause sysfs file
mm/damon/tests/core-kunit: test pause commitment
selftests/damon/_damon_sysfs: support pause file staging
selftests/damon/drgn_dump_damon_status: dump pause
selftests/damon/sysfs.py: check pause on assert_ctx_committed()
selftests/damon/sysfs.py: pause DAMON before dumping status
.../ABI/testing/sysfs-kernel-mm-damon | 7 ++++
Documentation/admin-guide/mm/damon/usage.rst | 12 ++++--
Documentation/mm/damon/design.rst | 7 ++++
include/linux/damon.h | 2 +
mm/damon/core.c | 9 +++++
mm/damon/sysfs.c | 31 +++++++++++++++
mm/damon/tests/core-kunit.h | 4 ++
tools/testing/selftests/damon/_damon_sysfs.py | 10 ++++-
.../selftests/damon/drgn_dump_damon_status.py | 1 +
tools/testing/selftests/damon/sysfs.py | 39 +++++++++++++++++++
10 files changed, 117 insertions(+), 5 deletions(-)
--
2.47.3
SeongJae Park
Mar 23, 2026, 7:15:46 PMMar 23
to SeongJae Park, Andrew Morton, Brendan Higgins, David Gow, da...@lists.linux.dev, kuni...@googlegroups.com, linux-...@vger.kernel.org, linux-k...@vger.kernel.org, linu...@kvack.org
SeongJae Park
Mar 23, 2026, 9:27:43 PMMar 23
to SeongJae Park, Liam R. Howlett, Andrew Morton, Brendan Higgins, David Gow, David Hildenbrand, Jonathan Corbet, Lorenzo Stoakes, Michal Hocko, Mike Rapoport, Shuah Khan, Shuah Khan, Suren Baghdasaryan, Vlastimil Babka, da...@lists.linux.dev, kuni...@googlegroups.com, linu...@vger.kernel.org, linux-...@vger.kernel.org, linux-k...@vger.kernel.org, linu...@kvack.org
# review url: https://sashiko.dev/#/patchset/202603232315...@kernel.org
- [RFC PATCH v5 01/10] mm/damon/core: introduce damon_ctx->paused
- [RFC PATCH v5 01/10] mm/damon/core: introduce damon_ctx->paused
- status: Reviewed
- review: ISSUES MAY FOUND
- [RFC PATCH v5 02/10] mm/damon/sysfs: add pause file under context dir
- review: ISSUES MAY FOUND
- status: Reviewed
- review: No issues found.
- [RFC PATCH v5 03/10] Docs/mm/damon/design: update for context pause/resume feature
- review: No issues found.
- status: Reviewed
- review: No issues found.
- [RFC PATCH v5 04/10] Docs/admin-guide/mm/damon/usage: update for pause file
- review: No issues found.
- status: Reviewed
- review: No issues found.
- [RFC PATCH v5 05/10] Docs/ABI/damon: update for pause sysfs file
- review: No issues found.
- status: Reviewed
- review: No issues found.
- [RFC PATCH v5 06/10] mm/damon/tests/core-kunit: test pause commitment
- review: No issues found.
- status: Reviewed
- review: No issues found.
- [RFC PATCH v5 07/10] selftests/damon/_damon_sysfs: support pause file staging
- review: No issues found.
- status: Reviewed
- review: ISSUES MAY FOUND
- [RFC PATCH v5 08/10] selftests/damon/drgn_dump_damon_status: dump pause
- review: ISSUES MAY FOUND
- status: Reviewed
- review: No issues found.
- [RFC PATCH v5 09/10] selftests/damon/sysfs.py: check pause on assert_ctx_committed()
- review: No issues found.
- status: Reviewed
- review: No issues found.
- [RFC PATCH v5 10/10] selftests/damon/sysfs.py: pause DAMON before dumping status
- review: No issues found.
- status: Reviewed
- review: No issues found.
- review: No issues found.
# hkml [1] generated a draft of this mail. It can be regenerated
# using below command:
#
# hkml patch sashiko_dev --thread_status --for_forwarding \
# 202603232315...@kernel.org
# using below command:
#
# hkml patch sashiko_dev --thread_status --for_forwarding \
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