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mm/damon/sysfs: implement a kdamond command for updating schemes' effective quotas

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Implement yet another kdamond 'state' file input command, namely
'update_schemes_effective_quotas'.  If it is written, the
'effective_bytes' files of the kdamond will be updated to provide the
current effective size quota of each scheme in bytes.

Link: https://lkml.kernel.org/r/20240219194431.159606-4-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
SeongJae Park 2024-02-19 11:44:14 -08:00 committed by Andrew Morton
parent 6813131578
commit c71f8a710c
3 changed files with 56 additions and 0 deletions
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4
mm/damon/sysfs-common.h
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@ -61,3 +61,7 @@ int damon_sysfs_schemes_clear_regions(
void damos_sysfs_set_quota_scores(struct damon_sysfs_schemes *sysfs_schemes,
struct damon_ctx *ctx);
void damos_sysfs_update_effective_quotas(
struct damon_sysfs_schemes *sysfs_schemes,
struct damon_ctx *ctx);

20
mm/damon/sysfs-schemes.c
View File

@ -1930,6 +1930,26 @@ void damos_sysfs_set_quota_scores(struct damon_sysfs_schemes *sysfs_schemes,
}
}
void damos_sysfs_update_effective_quotas(
struct damon_sysfs_schemes *sysfs_schemes,
struct damon_ctx *ctx)
{
struct damos *scheme;
int schemes_idx = 0;
damon_for_each_scheme(scheme, ctx) {
struct damon_sysfs_quotas *sysfs_quotas;
/* user could have removed the scheme sysfs dir */
if (schemes_idx >= sysfs_schemes->nr)
break;
sysfs_quotas =
sysfs_schemes->schemes_arr[schemes_idx++]->quotas;
sysfs_quotas->effective_sz = scheme->quota.esz;
}
}
static struct damos *damon_sysfs_mk_scheme(
struct damon_sysfs_scheme *sysfs_scheme)
{

32
mm/damon/sysfs.c
View File

@ -1019,6 +1019,11 @@ enum damon_sysfs_cmd {
* regions
*/
DAMON_SYSFS_CMD_CLEAR_SCHEMES_TRIED_REGIONS,
/*
* @DAMON_SYSFS_CMD_UPDATE_SCHEMES_EFFECTIVE_QUOTAS: Update the
* effective size quota of the scheme in bytes.
*/
DAMON_SYSFS_CMD_UPDATE_SCHEMES_EFFECTIVE_QUOTAS,
/*
* @NR_DAMON_SYSFS_CMDS: Total number of DAMON sysfs commands.
*/
@ -1035,6 +1040,7 @@ static const char * const damon_sysfs_cmd_strs[] = {
"update_schemes_tried_bytes",
"update_schemes_tried_regions",
"clear_schemes_tried_regions",
"update_schemes_effective_quotas",
};
/*
@ -1375,6 +1381,29 @@ static int damon_sysfs_commit_schemes_quota_goals(
return 0;
}
/*
* damon_sysfs_upd_schemes_effective_quotas() - Update schemes effective quotas
* sysfs files.
* @kdamond: The kobject wrapper that associated to the kdamond thread.
*
* This function reads the schemes' effective quotas of specific kdamond and
* update the related values for sysfs files. This function should be called
* from DAMON callbacks while holding ``damon_syfs_lock``, to safely access the
* DAMON contexts-internal data and DAMON sysfs variables.
*/
static int damon_sysfs_upd_schemes_effective_quotas(
struct damon_sysfs_kdamond *kdamond)
{
struct damon_ctx *ctx = kdamond->damon_ctx;
if (!ctx)
return -EINVAL;
damos_sysfs_update_effective_quotas(
kdamond->contexts->contexts_arr[0]->schemes, ctx);
return 0;
}
/*
* damon_sysfs_cmd_request_callback() - DAMON callback for handling requests.
* @c: The DAMON context of the callback.
@ -1437,6 +1466,9 @@ static int damon_sysfs_cmd_request_callback(struct damon_ctx *c, bool active,
case DAMON_SYSFS_CMD_CLEAR_SCHEMES_TRIED_REGIONS:
err = damon_sysfs_clear_schemes_regions(kdamond);
break;
case DAMON_SYSFS_CMD_UPDATE_SCHEMES_EFFECTIVE_QUOTAS:
err = damon_sysfs_upd_schemes_effective_quotas(kdamond);
break;
default:
break;
}