linux.git/include/linux/damon.h, branch v7.2-rc1

mm/damon: fix missing parens in macro arguments

2026-06-04T21:45:02+00:00

Patch series "mm/damon: fix macro arguments and clarify quota goals doc",
v2.


This patch (of 2):

The DAMON iterator macros do not wrap their pointer arguments with
parentheses.  This can cause build failures when the argument is a complex
expression due to operator precedence issues.

Add missing parentheses around the arguments in the following macros
to prevent potential build failures:
- damon_for_each_region()
- damon_for_each_region_from()
- damon_for_each_region_safe()
- damos_for_each_quota_goal()

Link: https://lore.kernel.org/20260521202020.126500-1-maksym.shcherba@lnu.edu.ua
Link: https://lore.kernel.org/20260521202020.126500-2-maksym.shcherba@lnu.edu.ua
Signed-off-by: Maksym Shcherba 
Reviewed-by: SeongJae Park 
Assisted-by: Antigravity:Gemini-3.1-Pro
Signed-off-by: Andrew Morton

mm/damon/core: hide damon_destroy_region()

2026-06-04T21:45:01+00:00

damon_destroy_region() is being used by only DAMON core, but exposed to
DAMON API callers.  Exposing something that is not really being used by
others will only increase the maintenance cost.  Hide it.

Link: https://lore.kernel.org/20260522154026.80546-8-sj@kernel.org
Signed-off-by: SeongJae Park 
Cc: Brendan Higgins 
Cc: Shuah Khan 
Signed-off-by: Andrew Morton

mm/damon/core: hide damon_insert_region()

2026-06-04T21:45:01+00:00

damon_insert_region() is being used by only DAMON core, but exposed to
DAMON API callers.  Exposing something that is not really being used by
others will only increase the maintenance cost.  Hide it.

Link: https://lore.kernel.org/20260522154026.80546-7-sj@kernel.org
Signed-off-by: SeongJae Park 
Cc: Brendan Higgins 
Cc: Shuah Khan 
Signed-off-by: Andrew Morton

mm/damon/core: hide damon_add_region()

2026-06-04T21:45:00+00:00

damon_add_region() is being used by only DAMON core, but exposed to DAMON
API callers.  Exposing something that is not really being used by others
will only increase the maintenance cost.  Hide it.

Link: https://lore.kernel.org/20260522154026.80546-6-sj@kernel.org
Signed-off-by: SeongJae Park 
Cc: Brendan Higgins 
Cc: Shuah Khan 
Signed-off-by: Andrew Morton

mm/damon/sysfs: setup damon_filter->memcg_id from path

2026-06-02T22:22:31+00:00

Find and set the memcg_id for damon_filter from the user-passed memory
cgroup path when updating the DAMON input parameters.

Link: https://lore.kernel.org/20260518234119.97569-27-sj@kernel.org
Signed-off-by: SeongJae Park 
Cc: David Hildenbrand 
Cc: Jonathan Corbet 
Cc: Liam R. Howlett 
Cc: Lorenzo Stoakes 
Cc: "Masami Hiramatsu (Google)" 
Cc: Mathieu Desnoyers 
Cc: Michal Hocko 
Cc: Mike Rapoport 
Cc: Shuah Khan 
Cc: Steven Rostedt 
Cc: Suren Baghdasaryan 
Cc: Vlastimil Babka 
Signed-off-by: Andrew Morton

mm/damon/core: introduce DAMON_FILTER_TYPE_MEMCG

2026-06-02T22:22:30+00:00

Belonging memory cgoup is another data attribute that can be useful to
monitor.  Introduce a new DAMON filter type, namely
DAMON_FILTER_TYPE_MEMCG, for monitoring of this attribute.

Link: https://lore.kernel.org/20260518234119.97569-23-sj@kernel.org
Signed-off-by: SeongJae Park 
Cc: David Hildenbrand 
Cc: Jonathan Corbet 
Cc: Liam R. Howlett 
Cc: Lorenzo Stoakes 
Cc: "Masami Hiramatsu (Google)" 
Cc: Mathieu Desnoyers 
Cc: Michal Hocko 
Cc: Mike Rapoport 
Cc: Shuah Khan 
Cc: Steven Rostedt 
Cc: Suren Baghdasaryan 
Cc: Vlastimil Babka 
Signed-off-by: Andrew Morton

mm/damon/core: introduce damon_ops->apply_probes

2026-06-02T22:22:26+00:00

Extend damon_operations struct with a new callback, namely apply_probes. 
The callback will be invoked for data attributes monitoring.  More
specifically, the callback will apply damon_probe objects to each region
and update the per-region per-probe counters for the number of encountered
probe-positive samples.

Link: https://lore.kernel.org/20260518234119.97569-7-sj@kernel.org
Signed-off-by: SeongJae Park 
Cc: David Hildenbrand 
Cc: Jonathan Corbet 
Cc: Liam R. Howlett 
Cc: Lorenzo Stoakes 
Cc: "Masami Hiramatsu (Google)" 
Cc: Mathieu Desnoyers 
Cc: Michal Hocko 
Cc: Mike Rapoport 
Cc: Shuah Khan 
Cc: Steven Rostedt 
Cc: Suren Baghdasaryan 
Cc: Vlastimil Babka 
Signed-off-by: Andrew Morton

mm/damon/core: introduce damon_region->probe_hits

2026-06-02T22:22:25+00:00

Add an array for the per-region per-probe positive samples count.  For
simple and efficient implementation, add a limit to the number of data
probes and set the array to support only the limited number of counters.

Link: https://lore.kernel.org/20260518234119.97569-6-sj@kernel.org
Signed-off-by: SeongJae Park 
Cc: David Hildenbrand 
Cc: Jonathan Corbet 
Cc: Liam R. Howlett 
Cc: Lorenzo Stoakes 
Cc: "Masami Hiramatsu (Google)" 
Cc: Mathieu Desnoyers 
Cc: Michal Hocko 
Cc: Mike Rapoport 
Cc: Shuah Khan 
Cc: Steven Rostedt 
Cc: Suren Baghdasaryan 
Cc: Vlastimil Babka 
Signed-off-by: Andrew Morton

mm/damon/core: introduce damon_filter

2026-06-02T22:22:25+00:00

Define a data structure for constructing damon_probe's attributes check,
namely damon_filter.  It is very similar to damos_filter but works only
for monitoring purposes.  Also embed that into damon_probe, implement
essential handling of the link, with fundamental helpers.

Link: https://lore.kernel.org/20260518234119.97569-4-sj@kernel.org
Signed-off-by: SeongJae Park 
Cc: David Hildenbrand 
Cc: Jonathan Corbet 
Cc: Liam R. Howlett 
Cc: Lorenzo Stoakes 
Cc: "Masami Hiramatsu (Google)" 
Cc: Mathieu Desnoyers 
Cc: Michal Hocko 
Cc: Mike Rapoport 
Cc: Shuah Khan 
Cc: Steven Rostedt 
Cc: Suren Baghdasaryan 
Cc: Vlastimil Babka 
Signed-off-by: Andrew Morton

mm/damon/core: embed damon_probe objects in damon_ctx

2026-06-02T22:22:25+00:00

Let damon_probe objects be able to be installed on a given damon_ctx, by
adding a linked list header for storing the objects.  Add initialization
and cleanup of the new field with helper functions, too.

Link: https://lore.kernel.org/20260518234119.97569-3-sj@kernel.org
Signed-off-by: SeongJae Park 
Cc: David Hildenbrand 
Cc: Jonathan Corbet 
Cc: Liam R. Howlett 
Cc: Lorenzo Stoakes 
Cc: "Masami Hiramatsu (Google)" 
Cc: Mathieu Desnoyers 
Cc: Michal Hocko 
Cc: Mike Rapoport 
Cc: Shuah Khan 
Cc: Steven Rostedt 
Cc: Suren Baghdasaryan 
Cc: Vlastimil Babka 
Signed-off-by: Andrew Morton