netdev - Re: [PATCH net-next 00/19] IPVS optimizations, part 2

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Date:	Thu, 28 Mar 2013 14:41:28 +0900
From:	Simon Horman <horms@...ge.net.au>
To:	Julian Anastasov <ja@....bg>
Cc:	lvs-devel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH net-next 00/19] IPVS optimizations, part 2

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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