diff options
| author | SeongJae Park <sj@kernel.org> | 2023-08-02 21:32:18 +0000 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2023-08-21 13:37:34 -0700 |
| commit | 6ad243b83b5094026fdb3171711ddb25246b3d8a (patch) | |
| tree | 92fac83fbbb5c6a3b4f47ba8b5d89462c3d18222 /mm/damon/sysfs-schemes.c | |
| parent | b69f92a741405336fb17a8a3d67fc144192fe8e2 (diff) | |
mm/damon/sysfs: implement a command for updating only schemes tried total bytes
Using tried_regions/total_bytes file, users can efficiently retrieve the
total size of memory regions having specific access pattern. However,
DAMON sysfs interface in kernel still populates all the infomration on the
tried_regions subdirectories. That means the kernel part overhead for the
construction of tried regions directories still exists. To remove the
overhead, implement yet another command input for 'state' DAMON sysfs
file. Writing the input to the file makes DAMON sysfs interface to update
only the total_bytes file.
Link: https://lkml.kernel.org/r/20230802213222.109841-3-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>
Diffstat (limited to 'mm/damon/sysfs-schemes.c')
| -rw-r--r-- | mm/damon/sysfs-schemes.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/mm/damon/sysfs-schemes.c b/mm/damon/sysfs-schemes.c index 6d3462eb31f2..9a015079f3a4 100644 --- a/mm/damon/sysfs-schemes.c +++ b/mm/damon/sysfs-schemes.c @@ -1635,6 +1635,7 @@ void damon_sysfs_schemes_update_stats( */ static struct damon_sysfs_schemes *damon_sysfs_schemes_for_damos_callback; static int damon_sysfs_schemes_region_idx; +static bool damos_regions_upd_total_bytes_only; /* * DAMON callback that called before damos apply. While this callback is @@ -1664,6 +1665,9 @@ static int damon_sysfs_before_damos_apply(struct damon_ctx *ctx, sysfs_regions = sysfs_schemes->schemes_arr[schemes_idx]->tried_regions; sysfs_regions->total_bytes += r->ar.end - r->ar.start; + if (damos_regions_upd_total_bytes_only) + return 0; + region = damon_sysfs_scheme_region_alloc(r); list_add_tail(®ion->list, &sysfs_regions->regions_list); sysfs_regions->nr_regions++; @@ -1702,10 +1706,11 @@ int damon_sysfs_schemes_clear_regions( /* 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 damon_ctx *ctx, bool total_bytes_only) { damon_sysfs_schemes_clear_regions(sysfs_schemes, ctx); damon_sysfs_schemes_for_damos_callback = sysfs_schemes; + damos_regions_upd_total_bytes_only = total_bytes_only; ctx->callback.before_damos_apply = damon_sysfs_before_damos_apply; return 0; } |