The patch titled
Subject: mm/damon/paddr: introduce DAMOS_MIGRATE_HOT action for promotion
has been added to the -mm mm-unstable branch. Its filename is
mm-damon-paddr-introduce-damos_migrate_hot-action-for-promotion.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-damon-paddr-introduce-damos_migrate_hot-action-for-promotion.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Hyeongtak Ji <hyeongtak.ji@xxxxxx>
Subject: mm/damon/paddr: introduce DAMOS_MIGRATE_HOT action for promotion
Date: Fri, 14 Jun 2024 12:00:08 +0900
This patch introduces DAMOS_MIGRATE_HOT action, which is similar to
DAMOS_MIGRATE_COLD, but proritizes hot pages.
It migrates pages inside the given region to the 'target_nid' NUMA node
in the sysfs.
Here is one of the example usage of this 'migrate_hot' action.
$ cd /sys/kernel/mm/damon/admin/kdamonds/<N>
$ cat contexts/<N>/schemes/<N>/action
migrate_hot
$ echo 0 > contexts/<N>/schemes/<N>/target_nid
$ echo commit > state
$ numactl -p 2 ./hot_cold 500M 600M &
$ numastat -c -p hot_cold
Per-node process memory usage (in MBs)
PID Node 0 Node 1 Node 2 Total
-------------- ------ ------ ------ -----
701 (hot_cold) 501 0 601 1101
Link: https://lkml.kernel.org/r/20240614030010.751-7-honggyu.kim@xxxxxx
Signed-off-by: Hyeongtak Ji <hyeongtak.ji@xxxxxx>
Signed-off-by: Honggyu Kim <honggyu.kim@xxxxxx>
Signed-off-by: SeongJae Park <sj@xxxxxxxxxx>
Cc: Gregory Price <gregory.price@xxxxxxxxxxxx>
Cc: Hyeonggon Yoo <42.hyeyoo@xxxxxxxxx>
Cc: Masami Hiramatsu (Google) <mhiramat@xxxxxxxxxx>
Cc: Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxxxx>
Cc: Rakie Kim <rakie.kim@xxxxxx>
Cc: Steven Rostedt (Google) <rostedt@xxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/damon.h | 2 ++
mm/damon/paddr.c | 3 +++
mm/damon/sysfs-schemes.c | 1 +
3 files changed, 6 insertions(+)
--- a/include/linux/damon.h~mm-damon-paddr-introduce-damos_migrate_hot-action-for-promotion
+++ a/include/linux/damon.h
@@ -105,6 +105,7 @@ struct damon_target {
* @DAMOS_NOHUGEPAGE: Call ``madvise()`` for the region with MADV_NOHUGEPAGE.
* @DAMOS_LRU_PRIO: Prioritize the region on its LRU lists.
* @DAMOS_LRU_DEPRIO: Deprioritize the region on its LRU lists.
+ * @DAMOS_MIGRATE_HOT: Migrate the regions prioritizing warmer regions.
* @DAMOS_MIGRATE_COLD: Migrate the regions prioritizing colder regions.
* @DAMOS_STAT: Do nothing but count the stat.
* @NR_DAMOS_ACTIONS: Total number of DAMOS actions
@@ -123,6 +124,7 @@ enum damos_action {
DAMOS_NOHUGEPAGE,
DAMOS_LRU_PRIO,
DAMOS_LRU_DEPRIO,
+ DAMOS_MIGRATE_HOT,
DAMOS_MIGRATE_COLD,
DAMOS_STAT, /* Do nothing but only record the stat */
NR_DAMOS_ACTIONS,
--- a/mm/damon/paddr.c~mm-damon-paddr-introduce-damos_migrate_hot-action-for-promotion
+++ a/mm/damon/paddr.c
@@ -486,6 +486,7 @@ static unsigned long damon_pa_apply_sche
return damon_pa_mark_accessed(r, scheme);
case DAMOS_LRU_DEPRIO:
return damon_pa_deactivate_pages(r, scheme);
+ case DAMOS_MIGRATE_HOT:
case DAMOS_MIGRATE_COLD:
return damon_pa_migrate(r, scheme);
case DAMOS_STAT:
@@ -508,6 +509,8 @@ static int damon_pa_scheme_score(struct
return damon_hot_score(context, r, scheme);
case DAMOS_LRU_DEPRIO:
return damon_cold_score(context, r, scheme);
+ case DAMOS_MIGRATE_HOT:
+ return damon_hot_score(context, r, scheme);
case DAMOS_MIGRATE_COLD:
return damon_cold_score(context, r, scheme);
default:
--- a/mm/damon/sysfs-schemes.c~mm-damon-paddr-introduce-damos_migrate_hot-action-for-promotion
+++ a/mm/damon/sysfs-schemes.c
@@ -1458,6 +1458,7 @@ static const char * const damon_sysfs_da
"nohugepage",
"lru_prio",
"lru_deprio",
+ "migrate_hot",
"migrate_cold",
"stat",
};
_
Patches currently in -mm which might be from hyeongtak.ji@xxxxxx are
mm-damon-sysfs-schemes-add-target_nid-on-sysfs-schemes.patch
mm-damon-paddr-introduce-damos_migrate_hot-action-for-promotion.patch
