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NFSv4.1: If slot allocation fails due to OOM, retry more quickly

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If the NFSv4.1 session slot allocation fails due to an ENOMEM condition,
then set the task->tk_timeout to 1/4 second to ensure that we do retry
the slot allocation more quickly.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust 2012-11-22 13:21:02 -05:00
parent ac0748359a
commit 69d206b5b3
1 changed files with 11 additions and 6 deletions
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17
fs/nfs/nfs4proc.c
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@ -662,7 +662,7 @@ static struct nfs4_slot *nfs4_find_or_create_slot(struct nfs4_slot_table *tbl,
return slot;
p = &slot->next;
}
return NULL;
return ERR_PTR(-ENOMEM);
}
/*
@ -676,7 +676,7 @@ static struct nfs4_slot *nfs4_find_or_create_slot(struct nfs4_slot_table *tbl,
*/
static struct nfs4_slot *nfs4_alloc_slot(struct nfs4_slot_table *tbl)
{
struct nfs4_slot *ret = NULL;
struct nfs4_slot *ret = ERR_PTR(-EBUSY);
u32 slotid;
dprintk("--> %s used_slots=%04lx highest_used=%u max_slots=%u\n",
@ -686,7 +686,7 @@ static struct nfs4_slot *nfs4_alloc_slot(struct nfs4_slot_table *tbl)
if (slotid > tbl->max_slotid)
goto out;
ret = nfs4_find_or_create_slot(tbl, slotid, 1, GFP_NOWAIT);
if (ret == NULL)
if (IS_ERR(ret))
goto out;
__set_bit(slotid, tbl->used_slots);
if (slotid > tbl->highest_used_slotid ||
@ -698,7 +698,7 @@ static struct nfs4_slot *nfs4_alloc_slot(struct nfs4_slot_table *tbl)
out:
dprintk("<-- %s used_slots=%04lx highest_used=%d slotid=%d \n",
__func__, tbl->used_slots[0], tbl->highest_used_slotid,
ret ? ret->slot_nr : -1);
!IS_ERR(ret) ? ret->slot_nr : -1);
return ret;
}
@ -727,6 +727,8 @@ int nfs41_setup_sequence(struct nfs4_session *session,
tbl = &session->fc_slot_table;
task->tk_timeout = 0;
spin_lock(&tbl->slot_tbl_lock);
if (test_bit(NFS4_SESSION_DRAINING, &session->session_state) &&
!rpc_task_has_priority(task, RPC_PRIORITY_PRIVILEGED)) {
@ -746,7 +748,10 @@ int nfs41_setup_sequence(struct nfs4_session *session,
}
slot = nfs4_alloc_slot(tbl);
if (slot == NULL) {
if (IS_ERR(slot)) {
/* If out of memory, try again in 1/4 second */
if (slot == ERR_PTR(-ENOMEM))
task->tk_timeout = HZ >> 2;
rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
spin_unlock(&tbl->slot_tbl_lock);
dprintk("<-- %s: no free slots\n", __func__);
@ -5778,7 +5783,7 @@ static int nfs4_grow_slot_table(struct nfs4_slot_table *tbl,
{
if (max_reqs <= tbl->max_slots)
return 0;
if (nfs4_find_or_create_slot(tbl, max_reqs - 1, ivalue, GFP_NOFS))
if (!IS_ERR(nfs4_find_or_create_slot(tbl, max_reqs - 1, ivalue, GFP_NOFS)))
return 0;
return -ENOMEM;
}