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net_sched: add the ability to defer skb freeing

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qdisc are changed under RTNL protection and often
while blocking BH and root qdisc spinlock.

When lots of skbs need to be dropped, we free
them under these locks causing TX/RX freezes,
and more generally latency spikes.

This commit adds rtnl_kfree_skbs(), used to queue
skbs for deferred freeing.

Actual freeing happens right after RTNL is released,
with appropriate scheduling points.

rtnl_qdisc_drop() can also be used in place
of disc_drop() when RTNL is held.

qdisc_reset_queue() and __qdisc_reset_queue() get
the new behavior, so standard qdiscs like pfifo, pfifo_fast...
have their ->reset() method automatically handled.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet
2016-06-13 20:21:50 -07:00
committed by David S. Miller
parent 35c55c9877
commit 1b5c5493e3
4 changed files with 38 additions and 7 deletions
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5
include/linux/rtnetlink.h
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@@ -89,8 +89,9 @@ void net_inc_egress_queue(void);
void net_dec_egress_queue(void);
#endif
extern void rtnetlink_init(void);
extern void __rtnl_unlock(void);
void rtnetlink_init(void);
void __rtnl_unlock(void);
void rtnl_kfree_skbs(struct sk_buff *head, struct sk_buff *tail);
#define ASSERT_RTNL() do { \
if (unlikely(!rtnl_is_locked())) { \