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mm/damon/paddr: introduce DAMOS_MIGRATE_HOT action for promotion

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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@sk.com
Signed-off-by: Hyeongtak Ji <hyeongtak.ji@sk.com>
Signed-off-by: Honggyu Kim <honggyu.kim@sk.com>
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: Gregory Price <gregory.price@memverge.com>
Cc: Hyeonggon Yoo <42.hyeyoo@gmail.com>
Cc: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Rakie Kim <rakie.kim@sk.com>
Cc: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Hyeongtak Ji 2024-06-14 12:00:08 +09:00 committed by Andrew Morton
parent b51820ebea
commit b696722d78
3 changed files with 6 additions and 0 deletions
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2
include/linux/damon.h
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@ -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,

3
mm/damon/paddr.c
View File

@ -486,6 +486,7 @@ static unsigned long damon_pa_apply_scheme(struct damon_ctx *ctx,
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 damon_ctx *context,
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:

1
mm/damon/sysfs-schemes.c
View File

@ -1458,6 +1458,7 @@ static const char * const damon_sysfs_damos_action_strs[] = {
"nohugepage",
"lru_prio",
"lru_deprio",
"migrate_hot",
"migrate_cold",
"stat",
};