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On Fri, Mar 22, 2013 at 11:46:35AM +0200, Julian Anastasov wrote:
> This is the second patchset with IPVS optimizations.
> Now we convert the schedulers, dests and services to RCU.
>
> All patches are for net-next based on the first
> patchset v3. The idea is after discussion and review Simon to
> apply the patchset after a week or so to ipvs-next tree.
>
> The changes in this patchset eliminate global locks
> from packet processing by using RCU. There are more details
> in the patches.
>
> After this patchset the situation is as follows:
>
> - dests:
> - lookups under RCU lock allow ip_vs_dest_hold, used
> for binding dest to conn or to select dest by scheduler
> - dests are freed by dest_trash code long after grace period
>
> - services:
> - no global read_lock
> - lookups under RCU lock allow scheduler to select
> dests under RCU lock
> - grace period implemented with IP_VS_WAIT_WHILE is
> gone allowing scheduler's dest selection and scheduler
> reconfiguration to run in parallel
>
> - schedulers:
> - schedule method runs under RCU lock, needs _rcu
> if using svc->destinations, needs _bh suffix to locks
> because it can be called in LOCAL_OUT hook
> - when dest is added, the add_dest method is called
> instead of update_service
> - when dest is deleted, the del_dest method is called
> instead of update_service
> - when dest is updated, the upd_dest method is called
> instead of update_service
> - scheduler can hold dests in its state long after they are
> unlinked from svc, even without providing del_dest handler.
> But such dests must not be returned by the
> schedule method (needs IP_VS_DEST_F_AVAILABLE check)
> - sched_data must be freed after grace period and
> module exit should be delayed with synchronize_rcu
> to wait all RCU read-side critical sections to
> complete
>
> - BH:
> - we do not disable BHs in LOCAL_OUT and sync code anymore
> - _bh suffixes are added to all places that need them,
> except timer handlers
Hi Julian,
what is the status of this series?
N.B: THis series is different to "[PATCH 00/15 v3] IPVS optimizations (repost)"
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