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NFSD: Fix the filecache LRU shrinker

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Without LRU item rotation, the shrinker visits only a few items on
the end of the LRU list, and those would always be long-term OPEN
files for NFSv4 workloads. That makes the filecache shrinker
completely ineffective.

Adopt the same strategy as the inode LRU by using LRU_ROTATE.

Suggested-by: Dave Chinner <david@fromorbit.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
This commit is contained in:
Chuck Lever 2022-07-08 14:25:24 -04:00
parent 4a0e73e635
commit edead3a558
1 changed files with 3 additions and 2 deletions
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5
fs/nfsd/filecache.c
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@ -446,6 +446,7 @@ nfsd_file_dispose_list_delayed(struct list_head *dispose)
*
* Return values:
* %LRU_REMOVED: @item was removed from the LRU
* %LRU_ROTATE: @item is to be moved to the LRU tail
* %LRU_SKIP: @item cannot be evicted
*/
static enum lru_status
@ -484,7 +485,7 @@ nfsd_file_lru_cb(struct list_head *item, struct list_lru_one *lru,
if (test_and_clear_bit(NFSD_FILE_REFERENCED, &nf->nf_flags)) {
trace_nfsd_file_gc_referenced(nf);
return LRU_SKIP;
return LRU_ROTATE;
}
if (!test_and_clear_bit(NFSD_FILE_HASHED, &nf->nf_flags)) {
@ -526,7 +527,7 @@ nfsd_file_gc(void)
unsigned long ret;
ret = list_lru_walk(&nfsd_file_lru, nfsd_file_lru_cb,
&dispose, LONG_MAX);
&dispose, list_lru_count(&nfsd_file_lru));
trace_nfsd_file_gc_removed(ret, list_lru_count(&nfsd_file_lru));
nfsd_file_gc_dispose_list(&dispose);
}