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NFSD: Delay adding new entries to LRU

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Neil Brown observes:
> I would not include RC_INPROG entries in the lru at all - they are
> always ignored, and will be added when they are switched to
> RCU_DONE.

I also removed a stale comment.

Suggested-by: NeilBrown <neil@brown.name>
Reviewed-by: NeilBrown <neil@brown.name>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
This commit is contained in:
Chuck Lever
2025-08-21 10:53:20 -04:00
parent d73d06dac6
commit fb340bfd48
1 changed files with 0 additions and 13 deletions
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13
fs/nfsd/nfscache.c
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@@ -237,10 +237,6 @@ void nfsd_reply_cache_shutdown(struct nfsd_net *nn)
}
/*
* Move cache entry to end of LRU list, and queue the cleaner to run if it's
* not already scheduled.
*/
static void
lru_put_end(struct nfsd_drc_bucket *b, struct nfsd_cacherep *rp)
{
@@ -272,13 +268,6 @@ nfsd_prune_bucket_locked(struct nfsd_net *nn, struct nfsd_drc_bucket *b,
/* The bucket LRU is ordered oldest-first. */
list_for_each_entry_safe(rp, tmp, &b->lru_head, c_lru) {
/*
* Don't free entries attached to calls that are still
* in-progress, but do keep scanning the list.
*/
if (rp->c_state == RC_INPROG)
continue;
if (atomic_read(&nn->num_drc_entries) <= nn->max_drc_entries &&
time_before(expiry, rp->c_timestamp))
break;
@@ -453,8 +442,6 @@ out:
nn->longest_chain_cachesize,
atomic_read(&nn->num_drc_entries));
}
lru_put_end(b, ret);
return ret;
}