diff options
| author | SeongJae Park <sj@kernel.org> | 2025-03-03 14:17:23 -0800 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2025-03-17 00:05:33 -0700 |
| commit | 1077605396b4da993327ebe40eabc28478e2be94 (patch) | |
| tree | 88e4eaac602630a3c364ef0499dbfc309e320105 | |
| parent | 0622c68d0a51f1268f3f9a171f4969c1bfc07c05 (diff) | |
mm/damon/sysfs: implement a command to update auto-tuned monitoring intervals
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>
| -rw-r--r-- | mm/damon/sysfs.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/mm/damon/sysfs.c b/mm/damon/sysfs.c index fa5f004f0670..ccd435d234b9 100644 --- a/mm/damon/sysfs.c +++ b/mm/damon/sysfs.c @@ -1214,6 +1214,11 @@ enum damon_sysfs_cmd { */ 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. */ NR_DAMON_SYSFS_CMDS, @@ -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; } |