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NFSD: Convert the filecache to use rhashtable

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Enable the filecache hash table to start small, then grow with the
workload. Smaller server deployments benefit because there should
be lower memory utilization. Larger server deployments should see
improved scaling with the number of open files.

Suggested-by: Jeff Layton <jlayton@kernel.org>
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 14:26:30 -04:00
parent fc22945ecc
commit ce502f81ba
2 changed files with 177 additions and 147 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

261
fs/nfsd/filecache.c
View File

@ -62,7 +62,6 @@ static struct nfsd_fcache_bucket *nfsd_file_hashtbl;
static struct list_lru nfsd_file_lru;
static unsigned long nfsd_file_flags;
static struct fsnotify_group *nfsd_file_fsnotify_group;
static atomic_long_t nfsd_filecache_count;
static struct delayed_work nfsd_filecache_laundrette;
static struct rhashtable nfsd_file_rhash_tbl
____cacheline_aligned_in_smp;
@ -198,7 +197,7 @@ static const struct rhashtable_params nfsd_file_rhash_params = {
static void
nfsd_file_schedule_laundrette(void)
{
if ((atomic_long_read(&nfsd_filecache_count) == 0) ||
if ((atomic_read(&nfsd_file_rhash_tbl.nelems) == 0) ||
test_bit(NFSD_FILE_CACHE_UP, &nfsd_file_flags) == 0)
return;
@ -298,7 +297,7 @@ nfsd_file_mark_find_or_create(struct nfsd_file *nf)
}
static struct nfsd_file *
nfsd_file_alloc(struct inode *inode, unsigned int may, struct net *net)
nfsd_file_alloc(struct nfsd_file_lookup_key *key, unsigned int may)
{
struct nfsd_file *nf;
@ -309,11 +308,14 @@ nfsd_file_alloc(struct inode *inode, unsigned int may, struct net *net)
nf->nf_birthtime = ktime_get();
nf->nf_file = NULL;
nf->nf_cred = get_current_cred();
nf->nf_net = net;
nf->nf_net = key->net;
nf->nf_flags = 0;
nf->nf_inode = inode;
refcount_set(&nf->nf_ref, 1);
nf->nf_may = may & NFSD_FILE_MAY_MASK;
__set_bit(NFSD_FILE_HASHED, &nf->nf_flags);
__set_bit(NFSD_FILE_PENDING, &nf->nf_flags);
nf->nf_inode = key->inode;
/* nf_ref is pre-incremented for hash table */
refcount_set(&nf->nf_ref, 2);
nf->nf_may = key->need;
nf->nf_mark = NULL;
trace_nfsd_file_alloc(nf);
}
@ -399,40 +401,21 @@ static void nfsd_file_lru_remove(struct nfsd_file *nf)
}
static void
nfsd_file_do_unhash(struct nfsd_file *nf)
nfsd_file_hash_remove(struct nfsd_file *nf)
{
struct inode *inode = nf->nf_inode;
unsigned int hashval = (unsigned int)hash_long(inode->i_ino,
NFSD_FILE_HASH_BITS);
lockdep_assert_held(&nfsd_file_hashtbl[hashval].nfb_lock);
trace_nfsd_file_unhash(nf);
if (nfsd_file_check_write_error(nf))
nfsd_reset_write_verifier(net_generic(nf->nf_net, nfsd_net_id));
--nfsd_file_hashtbl[hashval].nfb_count;
hlist_del_rcu(&nf->nf_node);
atomic_long_dec(&nfsd_filecache_count);
}
static void
nfsd_file_hash_remove(struct nfsd_file *nf)
{
struct inode *inode = nf->nf_inode;
unsigned int hashval = (unsigned int)hash_long(inode->i_ino,
NFSD_FILE_HASH_BITS);
spin_lock(&nfsd_file_hashtbl[hashval].nfb_lock);
nfsd_file_do_unhash(nf);
spin_unlock(&nfsd_file_hashtbl[hashval].nfb_lock);
rhashtable_remove_fast(&nfsd_file_rhash_tbl, &nf->nf_rhash,
nfsd_file_rhash_params);
}
static bool
nfsd_file_unhash(struct nfsd_file *nf)
{
if (test_and_clear_bit(NFSD_FILE_HASHED, &nf->nf_flags)) {
nfsd_file_do_unhash(nf);
nfsd_file_hash_remove(nf);
return true;
}
return false;
@ -442,9 +425,9 @@ nfsd_file_unhash(struct nfsd_file *nf)
* Return true if the file was unhashed.
*/
static bool
nfsd_file_unhash_and_release_locked(struct nfsd_file *nf, struct list_head *dispose)
nfsd_file_unhash_and_dispose(struct nfsd_file *nf, struct list_head *dispose)
{
trace_nfsd_file_unhash_and_release_locked(nf);
trace_nfsd_file_unhash_and_dispose(nf);
if (!nfsd_file_unhash(nf))
return false;
/* keep final reference for nfsd_file_lru_dispose */
@ -703,20 +686,23 @@ static struct shrinker nfsd_file_shrinker = {
static unsigned int
__nfsd_file_close_inode(struct inode *inode, struct list_head *dispose)
{
unsigned int hashval = (unsigned int)hash_long(inode->i_ino,
NFSD_FILE_HASH_BITS);
unsigned int count = 0;
struct nfsd_file *nf;
struct hlist_node *tmp;
struct nfsd_file_lookup_key key = {
.type = NFSD_FILE_KEY_INODE,
.inode = inode,
};
unsigned int count = 0;
struct nfsd_file *nf;
spin_lock(&nfsd_file_hashtbl[hashval].nfb_lock);
hlist_for_each_entry_safe(nf, tmp, &nfsd_file_hashtbl[hashval].nfb_head, nf_node) {
if (inode == nf->nf_inode) {
nfsd_file_unhash_and_release_locked(nf, dispose);
count++;
}
}
spin_unlock(&nfsd_file_hashtbl[hashval].nfb_lock);
rcu_read_lock();
do {
nf = rhashtable_lookup(&nfsd_file_rhash_tbl, &key,
nfsd_file_rhash_params);
if (!nf)
break;
nfsd_file_unhash_and_dispose(nf, dispose);
count++;
} while (1);
rcu_read_unlock();
return count;
}
@ -924,30 +910,35 @@ out_err:
static void
__nfsd_file_cache_purge(struct net *net)
{
unsigned int i;
struct nfsd_file *nf;
struct hlist_node *next;
struct rhashtable_iter iter;
struct nfsd_file *nf;
LIST_HEAD(dispose);
bool del;
for (i = 0; i < NFSD_FILE_HASH_SIZE; i++) {
struct nfsd_fcache_bucket *nfb = &nfsd_file_hashtbl[i];
rhashtable_walk_enter(&nfsd_file_rhash_tbl, &iter);
do {
rhashtable_walk_start(&iter);
spin_lock(&nfb->nfb_lock);
hlist_for_each_entry_safe(nf, next, &nfb->nfb_head, nf_node) {
nf = rhashtable_walk_next(&iter);
while (!IS_ERR_OR_NULL(nf)) {
if (net && nf->nf_net != net)
continue;
del = nfsd_file_unhash_and_release_locked(nf, &dispose);
del = nfsd_file_unhash_and_dispose(nf, &dispose);
/*
* Deadlock detected! Something marked this entry as
* unhased, but hasn't removed it from the hash list.
*/
WARN_ON_ONCE(!del);
nf = rhashtable_walk_next(&iter);
}
spin_unlock(&nfb->nfb_lock);
nfsd_file_dispose_list(&dispose);
}
rhashtable_walk_stop(&iter);
} while (nf == ERR_PTR(-EAGAIN));
rhashtable_walk_exit(&iter);
nfsd_file_dispose_list(&dispose);
}
static struct nfsd_fcache_disposal *
@ -1052,56 +1043,29 @@ nfsd_file_cache_shutdown(void)
}
}
static struct nfsd_file *
nfsd_file_find_locked(struct inode *inode, unsigned int may_flags,
unsigned int hashval, struct net *net)
{
struct nfsd_file *nf;
unsigned char need = may_flags & NFSD_FILE_MAY_MASK;
hlist_for_each_entry_rcu(nf, &nfsd_file_hashtbl[hashval].nfb_head,
nf_node, lockdep_is_held(&nfsd_file_hashtbl[hashval].nfb_lock)) {
if (nf->nf_may != need)
continue;
if (nf->nf_inode != inode)
continue;
if (nf->nf_net != net)
continue;
if (!nfsd_match_cred(nf->nf_cred, current_cred()))
continue;
if (!test_bit(NFSD_FILE_HASHED, &nf->nf_flags))
continue;
if (nfsd_file_get(nf) != NULL)
return nf;
}
return NULL;
}
/**
* nfsd_file_is_cached - are there any cached open files for this fh?
* @inode: inode of the file to check
* nfsd_file_is_cached - are there any cached open files for this inode?
* @inode: inode to check
*
* Scan the hashtable for open files that match this fh. Returns true if there
* are any, and false if not.
* The lookup matches inodes in all net namespaces and is atomic wrt
* nfsd_file_acquire().
*
* Return values:
* %true: filecache contains at least one file matching this inode
* %false: filecache contains no files matching this inode
*/
bool
nfsd_file_is_cached(struct inode *inode)
{
bool ret = false;
struct nfsd_file *nf;
unsigned int hashval;
struct nfsd_file_lookup_key key = {
.type = NFSD_FILE_KEY_INODE,
.inode = inode,
};
bool ret = false;
hashval = (unsigned int)hash_long(inode->i_ino, NFSD_FILE_HASH_BITS);
rcu_read_lock();
hlist_for_each_entry_rcu(nf, &nfsd_file_hashtbl[hashval].nfb_head,
nf_node) {
if (inode == nf->nf_inode) {
ret = true;
break;
}
}
rcu_read_unlock();
if (rhashtable_lookup_fast(&nfsd_file_rhash_tbl, &key,
nfsd_file_rhash_params) != NULL)
ret = true;
trace_nfsd_file_is_cached(inode, (int)ret);
return ret;
}
@ -1110,39 +1074,51 @@ static __be32
nfsd_do_file_acquire(struct svc_rqst *rqstp, struct svc_fh *fhp,
unsigned int may_flags, struct nfsd_file **pnf, bool open)
{
__be32 status;
struct net *net = SVC_NET(rqstp);
struct nfsd_file_lookup_key key = {
.type = NFSD_FILE_KEY_FULL,
.need = may_flags & NFSD_FILE_MAY_MASK,
.net = SVC_NET(rqstp),
};
struct nfsd_file *nf, *new;
struct inode *inode;
unsigned int hashval;
bool retry = true;
__be32 status;
/* FIXME: skip this if fh_dentry is already set? */
status = fh_verify(rqstp, fhp, S_IFREG,
may_flags|NFSD_MAY_OWNER_OVERRIDE);
if (status != nfs_ok)
return status;
key.inode = d_inode(fhp->fh_dentry);
key.cred = get_current_cred();
inode = d_inode(fhp->fh_dentry);
hashval = (unsigned int)hash_long(inode->i_ino, NFSD_FILE_HASH_BITS);
retry:
rcu_read_lock();
nf = nfsd_file_find_locked(inode, may_flags, hashval, net);
rcu_read_unlock();
/* Avoid allocation if the item is already in cache */
nf = rhashtable_lookup_fast(&nfsd_file_rhash_tbl, &key,
nfsd_file_rhash_params);
if (nf)
nf = nfsd_file_get(nf);
if (nf)
goto wait_for_construction;
new = nfsd_file_alloc(inode, may_flags, net);
new = nfsd_file_alloc(&key, may_flags);
if (!new) {
status = nfserr_jukebox;
goto out_status;
}
spin_lock(&nfsd_file_hashtbl[hashval].nfb_lock);
nf = nfsd_file_find_locked(inode, may_flags, hashval, net);
if (nf == NULL)
nf = rhashtable_lookup_get_insert_key(&nfsd_file_rhash_tbl,
&key, &new->nf_rhash,
nfsd_file_rhash_params);
if (!nf) {
nf = new;
goto open_file;
spin_unlock(&nfsd_file_hashtbl[hashval].nfb_lock);
}
if (IS_ERR(nf))
goto insert_err;
nf = nfsd_file_get(nf);
if (nf == NULL) {
nf = new;
goto open_file;
}
nfsd_file_slab_free(&new->nf_rcu);
wait_for_construction:
@ -1150,6 +1126,7 @@ wait_for_construction:
/* Did construction of this file fail? */
if (!test_bit(NFSD_FILE_HASHED, &nf->nf_flags)) {
trace_nfsd_file_cons_err(rqstp, key.inode, may_flags, nf);
if (!retry) {
status = nfserr_jukebox;
goto out;
@ -1174,22 +1151,11 @@ out:
}
out_status:
trace_nfsd_file_acquire(rqstp, inode, may_flags, nf, status);
put_cred(key.cred);
trace_nfsd_file_acquire(rqstp, key.inode, may_flags, nf, status);
return status;
open_file:
nf = new;
/* Take reference for the hashtable */
refcount_inc(&nf->nf_ref);
__set_bit(NFSD_FILE_HASHED, &nf->nf_flags);
__set_bit(NFSD_FILE_PENDING, &nf->nf_flags);
hlist_add_head_rcu(&nf->nf_node, &nfsd_file_hashtbl[hashval].nfb_head);
++nfsd_file_hashtbl[hashval].nfb_count;
nfsd_file_hashtbl[hashval].nfb_maxcount = max(nfsd_file_hashtbl[hashval].nfb_maxcount,
nfsd_file_hashtbl[hashval].nfb_count);
spin_unlock(&nfsd_file_hashtbl[hashval].nfb_lock);
atomic_long_inc(&nfsd_filecache_count);
nf->nf_mark = nfsd_file_mark_find_or_create(nf);
if (nf->nf_mark) {
if (open) {
@ -1204,19 +1170,20 @@ open_file:
* If construction failed, or we raced with a call to unlink()
* then unhash.
*/
if (status != nfs_ok || inode->i_nlink == 0) {
bool do_free;
nfsd_file_lru_remove(nf);
spin_lock(&nfsd_file_hashtbl[hashval].nfb_lock);
do_free = nfsd_file_unhash(nf);
spin_unlock(&nfsd_file_hashtbl[hashval].nfb_lock);
if (do_free)
if (status != nfs_ok || key.inode->i_nlink == 0)
if (nfsd_file_unhash(nf))
nfsd_file_put_noref(nf);
}
clear_bit_unlock(NFSD_FILE_PENDING, &nf->nf_flags);
smp_mb__after_atomic();
wake_up_bit(&nf->nf_flags, NFSD_FILE_PENDING);
goto out;
insert_err:
nfsd_file_slab_free(&new->nf_rcu);
trace_nfsd_file_insert_err(rqstp, key.inode, may_flags, PTR_ERR(nf));
nf = NULL;
status = nfserr_jukebox;
goto out_status;
}
/**
@ -1262,21 +1229,23 @@ static int nfsd_file_cache_stats_show(struct seq_file *m, void *v)
{
unsigned long releases = 0, pages_flushed = 0, evictions = 0;
unsigned long hits = 0, acquisitions = 0;
unsigned int i, count = 0, longest = 0;
unsigned int i, count = 0, buckets = 0;
unsigned long lru = 0, total_age = 0;
/*
* No need for spinlocks here since we're not terribly interested in
* accuracy. We do take the nfsd_mutex simply to ensure that we
* don't end up racing with server shutdown
*/
/* Serialize with server shutdown */
mutex_lock(&nfsd_mutex);
if (test_bit(NFSD_FILE_CACHE_UP, &nfsd_file_flags) == 1) {
for (i = 0; i < NFSD_FILE_HASH_SIZE; i++) {
count += nfsd_file_hashtbl[i].nfb_count;
longest = max(longest, nfsd_file_hashtbl[i].nfb_count);
}
struct bucket_table *tbl;
struct rhashtable *ht;
lru = list_lru_count(&nfsd_file_lru);
rcu_read_lock();
ht = &nfsd_file_rhash_tbl;
count = atomic_read(&ht->nelems);
tbl = rht_dereference_rcu(ht->tbl, ht);
buckets = tbl->size;
rcu_read_unlock();
}
mutex_unlock(&nfsd_mutex);
@ -1290,7 +1259,7 @@ static int nfsd_file_cache_stats_show(struct seq_file *m, void *v)
}
seq_printf(m, "total entries: %u\n", count);
seq_printf(m, "longest chain: %u\n", longest);
seq_printf(m, "hash buckets: %u\n", buckets);
seq_printf(m, "lru entries: %lu\n", lru);
seq_printf(m, "cache hits: %lu\n", hits);
seq_printf(m, "acquisitions: %lu\n", acquisitions);

63
fs/nfsd/trace.h
View File

@ -778,7 +778,7 @@ DEFINE_NFSD_FILE_EVENT(nfsd_file_alloc);
DEFINE_NFSD_FILE_EVENT(nfsd_file_put_final);
DEFINE_NFSD_FILE_EVENT(nfsd_file_unhash);
DEFINE_NFSD_FILE_EVENT(nfsd_file_put);
DEFINE_NFSD_FILE_EVENT(nfsd_file_unhash_and_release_locked);
DEFINE_NFSD_FILE_EVENT(nfsd_file_unhash_and_dispose);
TRACE_EVENT(nfsd_file_acquire,
TP_PROTO(
@ -821,6 +821,67 @@ TRACE_EVENT(nfsd_file_acquire,
__entry->nf_file, __entry->status)
);
TRACE_EVENT(nfsd_file_insert_err,
TP_PROTO(
const struct svc_rqst *rqstp,
const struct inode *inode,
unsigned int may_flags,
long error
),
TP_ARGS(rqstp, inode, may_flags, error),
TP_STRUCT__entry(
__field(u32, xid)
__field(const void *, inode)
__field(unsigned long, may_flags)
__field(long, error)
),
TP_fast_assign(
__entry->xid = be32_to_cpu(rqstp->rq_xid);
__entry->inode = inode;
__entry->may_flags = may_flags;
__entry->error = error;
),
TP_printk("xid=0x%x inode=%p may_flags=%s error=%ld",
__entry->xid, __entry->inode,
show_nfsd_may_flags(__entry->may_flags),
__entry->error
)
);
TRACE_EVENT(nfsd_file_cons_err,
TP_PROTO(
const struct svc_rqst *rqstp,
const struct inode *inode,
unsigned int may_flags,
const struct nfsd_file *nf
),
TP_ARGS(rqstp, inode, may_flags, nf),
TP_STRUCT__entry(
__field(u32, xid)
__field(const void *, inode)
__field(unsigned long, may_flags)
__field(unsigned int, nf_ref)
__field(unsigned long, nf_flags)
__field(unsigned long, nf_may)
__field(const void *, nf_file)
),
TP_fast_assign(
__entry->xid = be32_to_cpu(rqstp->rq_xid);
__entry->inode = inode;
__entry->may_flags = may_flags;
__entry->nf_ref = refcount_read(&nf->nf_ref);
__entry->nf_flags = nf->nf_flags;
__entry->nf_may = nf->nf_may;
__entry->nf_file = nf->nf_file;
),
TP_printk("xid=0x%x inode=%p may_flags=%s ref=%u nf_flags=%s nf_may=%s nf_file=%p",
__entry->xid, __entry->inode,
show_nfsd_may_flags(__entry->may_flags), __entry->nf_ref,
show_nf_flags(__entry->nf_flags),
show_nfsd_may_flags(__entry->nf_may), __entry->nf_file
)
);
TRACE_EVENT(nfsd_file_open,
TP_PROTO(struct nfsd_file *nf, __be32 status),
TP_ARGS(nf, status),