提交 869aa410 编写于 作者: E Eric Dumazet 提交者: David S. Miller

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 3f1e6d3f (sch_gred: should not use
GFP_KERNEL while holding a spinlock)
Signed-off-by: NEric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
上级 c607b2ed
......@@ -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;
}
......
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