From 772c15e5adcb32a42dbbcdb905ec49f662312976 Mon Sep 17 00:00:00 2001 From: SeongJae Park Date: Tue, 1 Nov 2022 22:03:25 +0000 Subject: mm/damon/sysfs-schemes: implement DAMOS-tried regions clear command When there are huge number of DAMON regions that specific scheme actions are tried to be applied, directories and files under 'tried_regions' scheme directory could waste some memory. Add another special input keyword ('clear_schemes_tried_regions') for 'state' file of each kdamond sysfs directory that can be used for cleanup of the 'tried_regions' sub-directories. [sj@kernel.org: skip regions clearing if the scheme directory was removed] Link: https://lkml.kernel.org/r/20221114182954.4745-3-sj@kernel.org Link: https://lkml.kernel.org/r/20221101220328.95765-6-sj@kernel.org Signed-off-by: SeongJae Park Cc: Jonathan Corbet Cc: Shuah Khan Signed-off-by: Andrew Morton --- mm/damon/sysfs.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) (limited to 'mm/damon/sysfs.c') diff --git a/mm/damon/sysfs.c b/mm/damon/sysfs.c index ffb5a84059d7..aeb0beb1da91 100644 --- a/mm/damon/sysfs.c +++ b/mm/damon/sysfs.c @@ -1004,6 +1004,11 @@ enum damon_sysfs_cmd { * regions */ DAMON_SYSFS_CMD_UPDATE_SCHEMES_TRIED_REGIONS, + /* + * @DAMON_SYSFS_CMD_CLEAR_SCHEMES_TRIED_REGIONS: Clear schemes tried + * regions + */ + DAMON_SYSFS_CMD_CLEAR_SCHEMES_TRIED_REGIONS, /* * @NR_DAMON_SYSFS_CMDS: Total number of DAMON sysfs commands. */ @@ -1017,6 +1022,7 @@ static const char * const damon_sysfs_cmd_strs[] = { "commit", "update_schemes_stats", "update_schemes_tried_regions", + "clear_schemes_tried_regions", }; /* @@ -1262,6 +1268,17 @@ static int damon_sysfs_upd_schemes_regions_stop( return damon_sysfs_schemes_update_regions_stop(ctx); } +static int damon_sysfs_clear_schemes_regions( + struct damon_sysfs_kdamond *kdamond) +{ + struct damon_ctx *ctx = kdamond->damon_ctx; + + if (!ctx) + return -EINVAL; + return damon_sysfs_schemes_clear_regions( + kdamond->contexts->contexts_arr[0]->schemes, ctx); +} + static inline bool damon_sysfs_kdamond_running( struct damon_sysfs_kdamond *kdamond) { @@ -1343,6 +1360,9 @@ static int damon_sysfs_cmd_request_callback(struct damon_ctx *c) damon_sysfs_schemes_regions_updating = false; } break; + case DAMON_SYSFS_CMD_CLEAR_SCHEMES_TRIED_REGIONS: + err = damon_sysfs_clear_schemes_regions(kdamond); + break; default: break; } -- cgit v1.2.3