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authorEric Dumazet <eric.dumazet@gmail.com>2011-12-16 02:09:45 +0400
committerDavid S. Miller <davem@davemloft.net>2011-12-17 00:40:33 +0400
commit869aa41044b04964e27822124b88f799e46f01b9 (patch)
tree740c289a40c1ffc9ec23d9369cdb9389b1edb8ca /net/sched/sch_gred.c
parentc607b2ed84929e143d9fb5653c4b5d0109147cde (diff)
downloadlinux-869aa41044b04964e27822124b88f799e46f01b9.tar.xz
sch_gred: prefer GFP_KERNEL allocations
In control path, its better to use GFP_KERNEL allocations where possible. Before taking qdisc spinlock, we preallocate memory just in case we'll need it in gred_change_vq() This is a followup to commit 3f1e6d3fd37b (sch_gred: should not use GFP_KERNEL while holding a spinlock) Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sched/sch_gred.c')
-rw-r--r--net/sched/sch_gred.c18
1 files changed, 11 insertions, 7 deletions
diff --git a/net/sched/sch_gred.c b/net/sched/sch_gred.c
index 1b5e63126cb3..53204de71c39 100644
--- a/net/sched/sch_gred.c
+++ b/net/sched/sch_gred.c
@@ -380,18 +380,19 @@ static inline int gred_change_table_def(struct Qdisc *sch, struct nlattr *dps)
static inline int gred_change_vq(struct Qdisc *sch, int dp,
struct tc_gred_qopt *ctl, int prio,
- u8 *stab, u32 max_P)
+ u8 *stab, u32 max_P,
+ struct gred_sched_data **prealloc)
{
struct gred_sched *table = qdisc_priv(sch);
- struct gred_sched_data *q;
+ struct gred_sched_data *q = table->tab[dp];
- if (table->tab[dp] == NULL) {
- table->tab[dp] = kzalloc(sizeof(*q), GFP_ATOMIC);
- if (table->tab[dp] == NULL)
+ if (!q) {
+ table->tab[dp] = q = *prealloc;
+ *prealloc = NULL;
+ if (!q)
return -ENOMEM;
}
- q = table->tab[dp];
q->DP = dp;
q->prio = prio;
q->limit = ctl->limit;
@@ -421,6 +422,7 @@ static int gred_change(struct Qdisc *sch, struct nlattr *opt)
int err, prio = GRED_DEF_PRIO;
u8 *stab;
u32 max_P;
+ struct gred_sched_data *prealloc;
if (opt == NULL)
return -EINVAL;
@@ -460,9 +462,10 @@ static int gred_change(struct Qdisc *sch, struct nlattr *opt)
prio = ctl->prio;
}
+ prealloc = kzalloc(sizeof(*prealloc), GFP_KERNEL);
sch_tree_lock(sch);
- err = gred_change_vq(sch, ctl->DP, ctl, prio, stab, max_P);
+ err = gred_change_vq(sch, ctl->DP, ctl, prio, stab, max_P, &prealloc);
if (err < 0)
goto errout_locked;
@@ -476,6 +479,7 @@ static int gred_change(struct Qdisc *sch, struct nlattr *opt)
errout_locked:
sch_tree_unlock(sch);
+ kfree(prealloc);
errout:
return err;
}