diff options
| author | Eric Dumazet <edumazet@google.com> | 2016-12-04 09:48:16 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2016-12-05 15:21:59 -0500 |
| commit | 1c0d32fde5bdf1184bc274f864c09799278a1114 (patch) | |
| tree | 47367d46dfc125e19294c3f5fa9a021520bd5660 /net/sched/sch_generic.c | |
| parent | a6e169312971219a34927e8fdece60046fafb8ba (diff) | |
net_sched: gen_estimator: complete rewrite of rate estimators
1) Old code was hard to maintain, due to complex lock chains.
(We probably will be able to remove some kfree_rcu() in callers)
2) Using a single timer to update all estimators does not scale.
3) Code was buggy on 32bit kernel (WRITE_ONCE() on 64bit quantity
is not supposed to work well)
In this rewrite :
- I removed the RB tree that had to be scanned in
gen_estimator_active(). qdisc dumps should be much faster.
- Each estimator has its own timer.
- Estimations are maintained in net_rate_estimator structure,
instead of dirtying the qdisc. Minor, but part of the simplification.
- Reading the estimator uses RCU and a seqcount to provide proper
support for 32bit kernels.
- We reduce memory need when estimators are not used, since
we store a pointer, instead of the bytes/packets counters.
- xt_rateest_mt() no longer has to grab a spinlock.
(In the future, xt_rateest_tg() could be switched to per cpu counters)
Signed-off-by: Eric Dumazet <edumazet@google.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.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/net/sched/sch_generic.c b/net/sched/sch_generic.c index 6cfb6e9038c2..6eb9c8e88519 100644 --- a/net/sched/sch_generic.c +++ b/net/sched/sch_generic.c @@ -709,7 +709,7 @@ void qdisc_destroy(struct Qdisc *qdisc) qdisc_put_stab(rtnl_dereference(qdisc->stab)); #endif - gen_kill_estimator(&qdisc->bstats, &qdisc->rate_est); + gen_kill_estimator(&qdisc->rate_est); if (ops->reset) ops->reset(qdisc); if (ops->destroy) |