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NFSv4: Final tweak to sequence id 

Sacrifice queueing fairness for performance.

 Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust 2005-10-20 14:22:41 -07:00
parent a0857d03b2
commit 4e51336a00
2 changed files with 14 additions and 11 deletions
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2
fs/nfs/nfs4_fs.h
View File

@ -110,8 +110,8 @@ struct nfs_seqid_counter {
};
struct nfs_seqid {
struct list_head list;
struct nfs_seqid_counter *sequence;
struct list_head list;
};
static inline void nfs_confirm_seqid(struct nfs_seqid_counter *seqid, int status)

23
fs/nfs/nfs4state.c
View File

@ -670,15 +670,12 @@ void nfs4_copy_stateid(nfs4_stateid *dst, struct nfs4_state *state, fl_owner_t f
struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter)
{
struct rpc_sequence *sequence = counter->sequence;
struct nfs_seqid *new;
new = kmalloc(sizeof(*new), GFP_KERNEL);
if (new != NULL) {
new->sequence = counter;
spin_lock(&sequence->lock);
list_add_tail(&new->list, &sequence->list);
spin_unlock(&sequence->lock);
INIT_LIST_HEAD(&new->list);
}
return new;
}
@ -687,10 +684,12 @@ void nfs_free_seqid(struct nfs_seqid *seqid)
{
struct rpc_sequence *sequence = seqid->sequence->sequence;
spin_lock(&sequence->lock);
list_del(&seqid->list);
rpc_wake_up(&sequence->wait);
spin_unlock(&sequence->lock);
if (!list_empty(&seqid->list)) {
spin_lock(&sequence->lock);
list_del(&seqid->list);
spin_unlock(&sequence->lock);
}
rpc_wake_up_next(&sequence->wait);
kfree(seqid);
}
@ -746,12 +745,16 @@ int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task)
struct rpc_sequence *sequence = seqid->sequence->sequence;
int status = 0;
if (sequence->list.next == &seqid->list)
goto out;
spin_lock(&sequence->lock);
if (sequence->list.next != &seqid->list) {
if (!list_empty(&sequence->list)) {
rpc_sleep_on(&sequence->wait, task, NULL, NULL);
status = -EAGAIN;
}
} else
list_add(&seqid->list, &sequence->list);
spin_unlock(&sequence->lock);
out:
return status;
}