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mm/damon/sysfs: implement a command to update auto-tuned monitoring intervals

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DAMON kernel API callers can show auto-tuned sampling and aggregation
intervals from the monmitoring attributes data structure.  That can be
useful for debugging or tuning of the feature.  DAMON user-space ABI users
has no way to see that, though.  Implement a new DAMON sysfs interface
command, namely 'update_tuned_intervals', for the purpose.  If the command
is written to the kdamond state file, the tuned sampling and aggregation
intervals will be updated to the corresponding sysfs interface files.

Link: https://lkml.kernel.org/r/20250303221726.484227-6-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
SeongJae Park 2025-03-03 14:17:23 -08:00 committed by Andrew Morton
parent 0622c68d0a
commit 1077605396
1 changed files with 20 additions and 0 deletions
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20
mm/damon/sysfs.c
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@ -1213,6 +1213,11 @@ enum damon_sysfs_cmd {
* effective size quota of the scheme in bytes.
*/
DAMON_SYSFS_CMD_UPDATE_SCHEMES_EFFECTIVE_QUOTAS,
/*
* @DAMON_SYSFS_CMD_UPDATE_TUNED_INTERVALS: Update the tuned monitoring
* intevals.
*/
DAMON_SYSFS_CMD_UPDATE_TUNED_INTERVALS,
/*
* @NR_DAMON_SYSFS_CMDS: Total number of DAMON sysfs commands.
*/
@ -1230,6 +1235,7 @@ static const char * const damon_sysfs_cmd_strs[] = {
"update_schemes_tried_regions",
"clear_schemes_tried_regions",
"update_schemes_effective_quotas",
"update_tuned_intervals",
};
/*
@ -1502,6 +1508,17 @@ static int damon_sysfs_upd_schemes_effective_quotas(void *data)
return 0;
}
static int damon_sysfs_upd_tuned_intervals(void *data)
{
struct damon_sysfs_kdamond *kdamond = data;
struct damon_ctx *ctx = kdamond->damon_ctx;
kdamond->contexts->contexts_arr[0]->attrs->intervals->sample_us =
ctx->attrs.sample_interval;
kdamond->contexts->contexts_arr[0]->attrs->intervals->aggr_us =
ctx->attrs.aggr_interval;
return 0;
}
/*
* damon_sysfs_cmd_request_callback() - DAMON callback for handling requests.
@ -1723,6 +1740,9 @@ static int damon_sysfs_handle_cmd(enum damon_sysfs_cmd cmd,
return damon_sysfs_damon_call(
damon_sysfs_upd_schemes_effective_quotas,
kdamond);
case DAMON_SYSFS_CMD_UPDATE_TUNED_INTERVALS:
return damon_sysfs_damon_call(
damon_sysfs_upd_tuned_intervals, kdamond);
default:
break;
}