github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-05-28 00:53:34 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

mm/damon/lru_sort: support active:inactive memory ratio based auto-tuning

Browse Source 
Doing DAMOS_LRU_[DE]PRIO with DAMOS_QUOTA_[IN]ACTIVE_MEM_BP based quota
auto-tuning can be easy and intuitive, compared to the manual
[de]prioritization target access pattern thresholds tuning.  For example,
users can ask DAMON to "find hot/cold pages and activate/deactivate those
aiming 50:50 active:inactive memory size." But DAMON_LRU_SORT has no
interface to do that.  Add a module parameter for setting the target
ratio.

[sj@kernel.org: add inactive mem ratio quota goal to cold_scheme]
  Link: https://lkml.kernel.org/r/20260114055308.79884-1-sj@kernel.org
Link: https://lkml.kernel.org/r/20260113152717.70459-9-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: David Hildenbrand <david@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
SeongJae Park 2026-01-13 07:27:13 -08:00 committed by Andrew Morton
parent b36aefb866
commit 40d98d31cd
1 changed files with 37 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

37
mm/damon/lru_sort.c
View File

@ -41,6 +41,20 @@ static bool enabled __read_mostly;
static bool commit_inputs __read_mostly;
module_param(commit_inputs, bool, 0600);
/*
* Desired active to [in]active memory ratio in bp (1/10,000).
*
* While keeping the caps that set by other quotas, DAMON_LRU_SORT
* automatically increases and decreases the effective level of the quota
* aiming the LRU [de]prioritizations of the hot and cold memory resulting in
* this active to [in]active memory ratio. Value zero means disabling this
* auto-tuning feature.
*
* Disabled by default.
*/
static unsigned long active_mem_bp __read_mostly;
module_param(active_mem_bp, ulong, 0600);
/*
* Filter [non-]young pages accordingly for LRU [de]prioritizations.
*
@ -208,6 +222,26 @@ static struct damos *damon_lru_sort_new_cold_scheme(unsigned int cold_thres)
return damon_lru_sort_new_scheme(&pattern, DAMOS_LRU_DEPRIO);
}
static int damon_lru_sort_add_quota_goals(struct damos *hot_scheme,
struct damos *cold_scheme)
{
struct damos_quota_goal *goal;
if (!active_mem_bp)
return 0;
goal = damos_new_quota_goal(DAMOS_QUOTA_ACTIVE_MEM_BP, active_mem_bp);
if (!goal)
return -ENOMEM;
damos_add_quota_goal(&hot_scheme->quota, goal);
/* aim 0.2 % goal conflict, to keep little ping pong */
goal = damos_new_quota_goal(DAMOS_QUOTA_INACTIVE_MEM_BP,
10000 - active_mem_bp + 2);
if (!goal)
return -ENOMEM;
damos_add_quota_goal(&cold_scheme->quota, goal);
return 0;
}
static int damon_lru_sort_add_filters(struct damos *hot_scheme,
struct damos *cold_scheme)
{
@ -277,6 +311,9 @@ static int damon_lru_sort_apply_parameters(void)
damon_set_schemes(param_ctx, &hot_scheme, 1);
damon_add_scheme(param_ctx, cold_scheme);
err = damon_lru_sort_add_quota_goals(hot_scheme, cold_scheme);
if (err)
goto out;
err = damon_lru_sort_add_filters(hot_scheme, cold_scheme);
if (err)
goto out;