linux.git/samples/damon, branch v6.17-rc6

mm/damon/vaddr: put pid in cleanup_target()

2025-07-20T01:59:56+00:00

Implement cleanup_target() callback for [f]vaddr, which calls put_pid()
for each target that will be destroyed.  Also remove redundant put_pid()
calls in core, sysfs and sample modules, which were required to be done
redundantly due to the lack of such self cleanup in vaddr.

Link: https://lkml.kernel.org/r/20250712195016.151108-11-sj@kernel.org
Signed-off-by: SeongJae Park 
Signed-off-by: Andrew Morton

samples/damon/wsse: use damon_call() repeat mode instead of damon_callback

2025-07-20T01:59:55+00:00

wsse uses damon_callback for periodically reading DAMON internal data. 
Use its alternative, damon_call() repeat mode.

Link: https://lkml.kernel.org/r/20250712195016.151108-8-sj@kernel.org
Signed-off-by: SeongJae Park 
Signed-off-by: Andrew Morton

samples/damon/prcl: use damon_call() repeat mode instead of damon_callback

2025-07-20T01:59:55+00:00

prcl uses damon_callback for periodically reading DAMON internal data. 
Use its alternative, damon_call() repeat mode.

Link: https://lkml.kernel.org/r/20250712195016.151108-7-sj@kernel.org
Signed-off-by: SeongJae Park 
Signed-off-by: Andrew Morton

samples/damon: support automatic node address detection

2025-07-20T01:59:47+00:00

This patch adds a new knob `detect_node_addresses`, which determines
whether the physical address range is set manually using the existing
knobs or automatically by the mtier module.  When `detect_node_addresses`
set to 'Y', mtier automatically converts node0 and node1 to their physical
addresses.  If set to 'N', it uses the existing 'node#_start_addr' and
'node#_end_addr' to define regions as before.

Link: https://lkml.kernel.org/r/20250707235919.513-1-yunjeong.mun@sk.com
Signed-off-by: Yunjeong Mun 
Suggested-by: Honggyu Kim 
Reviewed-by: SeongJae Park 
Signed-off-by: Andrew Morton

samples/damon: change enable parameters to enabled

2025-07-20T01:59:47+00:00

The damon_{lru_sort,reclaim,stat} kernel modules use "enabled" parameter
knobs as follows.

  /sys/module/damon_lru_sort/parameters/enabled
  /sys/module/damon_reclaim/parameters/enabled
  /sys/module/damon_stat/parameters/enabled

However, other sample modules of damon use "enable" parameter knobs so
it'd be better to rename them from "enable" to "enabled" to keep the
consistency with other damon modules.

Before:
  /sys/module/damon_sample_wsse/parameters/enable
  /sys/module/damon_sample_prcl/parameters/enable
  /sys/module/damon_sample_mtier/parameters/enable

After:
  /sys/module/damon_sample_wsse/parameters/enabled
  /sys/module/damon_sample_prcl/parameters/enabled
  /sys/module/damon_sample_mtier/parameters/enabled

There is no functional changes in this patch.

Link: https://lkml.kernel.org/r/20250707024548.1964-1-honggyu.kim@sk.com
Signed-off-by: Honggyu Kim 
Reviewed-by: SeongJae Park 
Signed-off-by: Andrew Morton

samples/damon/mtier: rename to have damon_sample_ prefix

2025-07-20T01:59:43+00:00

DAMON sample module, mtier has its name 'mtier'.  It could conflict with
future modules, and not very easy to identify it by name.  Use a prefix,
"damon_sample_" for the name.

Note that this could break users if they depend on the old name.  But it
is just a sample, so no such usage is expected, or known.  Even if such
usage exists, updating it for the new name should be straightforward.

Link: https://lkml.kernel.org/r/20250705175000.56259-4-sj@kernel.org
Signed-off-by: SeongJae Park 
Signed-off-by: Andrew Morton

samples/damon/prcl: rename to have damon_sample_ prefix

2025-07-20T01:59:43+00:00

DAMON sample module, prcl has its name 'prcl'.  It could conflict with
future modules, and not very easy to identify it by name.  Use a prefix,
"damon_sample_" for the name.

Note that this could break users if they depend on the old name.  But it
is just a sample, so no such usage is expected, or known.  Even if such
usage exists, updating it for the new name should be straightforward.

Link: https://lkml.kernel.org/r/20250705175000.56259-3-sj@kernel.org
Signed-off-by: SeongJae Park 
Signed-off-by: Andrew Morton

samples/damon/wsse: rename to have damon_sample_ prefix

2025-07-20T01:59:43+00:00

Patch series "mm/damon: misc cleanups".

Yet another round of miscellaneous DAMON cleanups.


This patch (of 6):

DAMON sample module, wsse has its name 'wsse'.  It could conflict with
future modules, and not very easy to identify it by name.  Use a prefix,
"damon_sample_" for the name.

Note that this could break users if they depend on the old name.  But it
is just a sample, so no such usage is expected, or known.  Even if such
usage exists, updating it for the new name should be straightforward.

Link: https://lkml.kernel.org/r/20250705175000.56259-1-sj@kernel.org
Link: https://lkml.kernel.org/r/20250705175000.56259-2-sj@kernel.org
Signed-off-by: SeongJae Park 
Signed-off-by: Andrew Morton

samples/damon/mtier: support boot time enable setup

2025-07-13T23:38:34+00:00

If 'enable' parameter of the 'mtier' DAMON sample module is set at boot
time via the kernel command line, memory allocation is tried before the
slab is initialized.  As a result kernel NULL pointer dereference BUG can
happen.  Fix it by checking the initialization status.

Link: https://lkml.kernel.org/r/20250706193207.39810-4-sj@kernel.org
Fixes: 82a08bde3cf7 ("samples/damon: implement a DAMON module for memory tiering")
Signed-off-by: SeongJae Park 
Cc: 
Signed-off-by: Andrew Morton

samples/damon/prcl: fix boot time enable crash

2025-07-13T23:38:34+00:00

If 'enable' parameter of the 'prcl' DAMON sample module is set at boot
time via the kernel command line, memory allocation is tried before the
slab is initialized.  As a result kernel NULL pointer dereference BUG can
happen.  Fix it by checking the initialization status.

Link: https://lkml.kernel.org/r/20250706193207.39810-3-sj@kernel.org
Fixes: 2aca254620a8 ("samples/damon: introduce a skeleton of a smaple DAMON module for proactive reclamation")
Signed-off-by: SeongJae Park 
Signed-off-by: Andrew Morton