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mm/damon/sysfs: implement DAMOS tried regions update command

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Implement the code for filling the data of 'tried_regions' DAMON sysfs
directory.  With this commit, DAMON sysfs interface users can write a
special keyword, 'update_schemes_tried_regions' to the corresponding
'state' file of the kdamond.  Then, DAMON sysfs interface will collect the
tried regions information using the 'before_damos_apply()' callback for
one aggregation interval and populate scheme region directories with the
values.

[sj@kernel.org: skip tried regions update if the scheme directory was removed]
  Link: https://lkml.kernel.org/r/20221114182954.4745-2-sj@kernel.org
Link: https://lkml.kernel.org/r/20221101220328.95765-5-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
SeongJae Park 2022-11-01 22:03:24 +00:00 committed by Andrew Morton
parent 9277d0367b
commit f1d13cacab
3 changed files with 141 additions and 2 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

6
mm/damon/sysfs-common.h
View file

@ -44,3 +44,9 @@ int damon_sysfs_set_schemes(struct damon_ctx *ctx,
void damon_sysfs_schemes_update_stats(
struct damon_sysfs_schemes *sysfs_schemes,
struct damon_ctx *ctx);
int damon_sysfs_schemes_update_regions_start(
struct damon_sysfs_schemes *sysfs_schemes,
struct damon_ctx *ctx);
int damon_sysfs_schemes_update_regions_stop(struct damon_ctx *ctx);

80
mm/damon/sysfs-schemes.c
View file

@ -1244,3 +1244,83 @@ void damon_sysfs_schemes_update_stats(
sysfs_stats->qt_exceeds = scheme->stat.qt_exceeds;
}
}
/*
* damon_sysfs_schemes that need to update its schemes regions dir. Protected
* by damon_sysfs_lock
*/
static struct damon_sysfs_schemes *damon_sysfs_schemes_for_damos_callback;
static int damon_sysfs_schemes_region_idx;
/*
* DAMON callback that called before damos apply. While this callback is
* registered, damon_sysfs_lock should be held to ensure the regions
* directories exist.
*/
static int damon_sysfs_before_damos_apply(struct damon_ctx *ctx,
struct damon_target *t, struct damon_region *r,
struct damos *s)
{
struct damos *scheme;
struct damon_sysfs_scheme_regions *sysfs_regions;
struct damon_sysfs_scheme_region *region;
struct damon_sysfs_schemes *sysfs_schemes =
damon_sysfs_schemes_for_damos_callback;
int schemes_idx = 0;
damon_for_each_scheme(scheme, ctx) {
if (scheme == s)
break;
schemes_idx++;
}
/* user could have removed the scheme sysfs dir */
if (schemes_idx >= sysfs_schemes->nr)
return 0;
sysfs_regions = sysfs_schemes->schemes_arr[schemes_idx]->tried_regions;
region = damon_sysfs_scheme_region_alloc(r);
list_add_tail(&region->list, &sysfs_regions->regions_list);
sysfs_regions->nr_regions++;
if (kobject_init_and_add(&region->kobj,
&damon_sysfs_scheme_region_ktype,
&sysfs_regions->kobj, "%d",
damon_sysfs_schemes_region_idx++)) {
kobject_put(&region->kobj);
}
return 0;
}
/* Called from damon_sysfs_cmd_request_callback under damon_sysfs_lock */
int damon_sysfs_schemes_update_regions_start(
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_scheme *sysfs_scheme;
sysfs_scheme = sysfs_schemes->schemes_arr[schemes_idx++];
damon_sysfs_scheme_regions_rm_dirs(
sysfs_scheme->tried_regions);
}
damon_sysfs_schemes_for_damos_callback = sysfs_schemes;
ctx->callback.before_damos_apply = damon_sysfs_before_damos_apply;
return 0;
}
/*
* Called from damon_sysfs_cmd_request_callback under damon_sysfs_lock. Caller
* should unlock damon_sysfs_lock which held before
* damon_sysfs_schemes_update_regions_start()
*/
int damon_sysfs_schemes_update_regions_stop(struct damon_ctx *ctx)
{
damon_sysfs_schemes_for_damos_callback = NULL;
ctx->callback.before_damos_apply = NULL;
damon_sysfs_schemes_region_idx = 0;
return 0;
}

55
mm/damon/sysfs.c
View file

@ -999,6 +999,11 @@ enum damon_sysfs_cmd {
* files.
*/
DAMON_SYSFS_CMD_UPDATE_SCHEMES_STATS,
/*
* @DAMON_SYSFS_CMD_UPDATE_SCHEMES_TRIED_REGIONS: Update schemes tried
* regions
*/
DAMON_SYSFS_CMD_UPDATE_SCHEMES_TRIED_REGIONS,
/*
* @NR_DAMON_SYSFS_CMDS: Total number of DAMON sysfs commands.
*/
@ -1011,6 +1016,7 @@ static const char * const damon_sysfs_cmd_strs[] = {
"off",
"commit",
"update_schemes_stats",
"update_schemes_tried_regions",
};
/*
@ -1193,6 +1199,16 @@ static int damon_sysfs_set_targets(struct damon_ctx *ctx,
static void damon_sysfs_before_terminate(struct damon_ctx *ctx)
{
struct damon_target *t, *next;
struct damon_sysfs_kdamond *kdamond;
/* damon_sysfs_schemes_update_regions_stop() might not yet called */
kdamond = damon_sysfs_cmd_request.kdamond;
if (kdamond && damon_sysfs_cmd_request.cmd ==
DAMON_SYSFS_CMD_UPDATE_SCHEMES_TRIED_REGIONS &&
ctx == kdamond->damon_ctx) {
damon_sysfs_schemes_update_regions_stop(ctx);
mutex_unlock(&damon_sysfs_lock);
}
if (!damon_target_has_pid(ctx))
return;
@ -1225,6 +1241,27 @@ static int damon_sysfs_upd_schemes_stats(struct damon_sysfs_kdamond *kdamond)
return 0;
}
static int damon_sysfs_upd_schemes_regions_start(
struct damon_sysfs_kdamond *kdamond)
{
struct damon_ctx *ctx = kdamond->damon_ctx;
if (!ctx)
return -EINVAL;
return damon_sysfs_schemes_update_regions_start(
kdamond->contexts->contexts_arr[0]->schemes, ctx);
}
static int damon_sysfs_upd_schemes_regions_stop(
struct damon_sysfs_kdamond *kdamond)
{
struct damon_ctx *ctx = kdamond->damon_ctx;
if (!ctx)
return -EINVAL;
return damon_sysfs_schemes_update_regions_stop(ctx);
}
static inline bool damon_sysfs_kdamond_running(
struct damon_sysfs_kdamond *kdamond)
{
@ -1277,10 +1314,12 @@ static int damon_sysfs_commit_input(struct damon_sysfs_kdamond *kdamond)
static int damon_sysfs_cmd_request_callback(struct damon_ctx *c)
{
struct damon_sysfs_kdamond *kdamond;
static bool damon_sysfs_schemes_regions_updating;
int err = 0;
/* avoid deadlock due to concurrent state_store('off') */
if (!mutex_trylock(&damon_sysfs_lock))
if (!damon_sysfs_schemes_regions_updating &&
!mutex_trylock(&damon_sysfs_lock))
return 0;
kdamond = damon_sysfs_cmd_request.kdamond;
if (!kdamond || kdamond->damon_ctx != c)
@ -1292,13 +1331,27 @@ static int damon_sysfs_cmd_request_callback(struct damon_ctx *c)
case DAMON_SYSFS_CMD_COMMIT:
err = damon_sysfs_commit_input(kdamond);
break;
case DAMON_SYSFS_CMD_UPDATE_SCHEMES_TRIED_REGIONS:
if (!damon_sysfs_schemes_regions_updating) {
err = damon_sysfs_upd_schemes_regions_start(kdamond);
if (!err) {
damon_sysfs_schemes_regions_updating = true;
goto keep_lock_out;
}
} else {
err = damon_sysfs_upd_schemes_regions_stop(kdamond);
damon_sysfs_schemes_regions_updating = false;
}
break;
default:
break;
}
/* Mark the request as invalid now. */
damon_sysfs_cmd_request.kdamond = NULL;
out:
if (!damon_sysfs_schemes_regions_updating)
mutex_unlock(&damon_sysfs_lock);
keep_lock_out:
return err;
}