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authorEric Dumazet <eric.dumazet@gmail.com>2011-01-20 03:48:19 +0000
committerDavid S. Miller <davem@davemloft.net>2011-01-20 16:59:32 -0800
commita2da570d62fcb9e8816f6920e1ec02c706b289fa (patch)
tree9a24b76262c40ec2f1be11e29e224c7d7b20fa26 /net/sched/sch_generic.c
parentfd245a4adb5288eac37250875f237c40a20a1944 (diff)
downloadblackbird-op-linux-a2da570d62fcb9e8816f6920e1ec02c706b289fa.tar.gz
blackbird-op-linux-a2da570d62fcb9e8816f6920e1ec02c706b289fa.zip
net_sched: RCU conversion of stab
This patch converts stab qdisc management to RCU, so that we can perform the qdisc_calculate_pkt_len() call before getting qdisc lock. This shortens the lock's held time in __dev_xmit_skb(). This permits more qdiscs to get TCQ_F_CAN_BYPASS status, avoiding lot of cache misses and so reducing latencies. Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> CC: Patrick McHardy <kaber@trash.net> CC: Jesper Dangaard Brouer <hawk@diku.dk> CC: Jarek Poplawski <jarkao2@gmail.com> CC: Jamal Hadi Salim <hadi@cyberus.ca> CC: Stephen Hemminger <shemminger@vyatta.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sched/sch_generic.c')
-rw-r--r--net/sched/sch_generic.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/net/sched/sch_generic.c b/net/sched/sch_generic.c
index 2f1cb62130da..cc17e794c41e 100644
--- a/net/sched/sch_generic.c
+++ b/net/sched/sch_generic.c
@@ -632,7 +632,7 @@ void qdisc_destroy(struct Qdisc *qdisc)
#ifdef CONFIG_NET_SCHED
qdisc_list_del(qdisc);
- qdisc_put_stab(qdisc->stab);
+ qdisc_put_stab(rtnl_dereference(qdisc->stab));
#endif
gen_kill_estimator(&qdisc->bstats, &qdisc->rate_est);
if (ops->reset)
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