On Sat, 21 Jul 2012, Eric Dumazet wrote:
> The writer sides might be run concurrently by several cpus, so
> u64_stats_update_begin(&sstats->syncp); are racy : a reader can
> be trapped forever.
> > net/netfilter/ipvs/ip_vs_est.c
> Same problem for this one, I think.
> I CCed ipvs maintainers so that they can take a look.
IPVS moved to percpu counters, i.e. even on 32-bit SMP
we do not use locks to protect the seqcounter:
Author: Hans Schillstrom <hans.schillstrom@xxxxxxxxxxxx>
Date: Mon Jan 3 14:44:56 2011 +0100
IPVS: netns, ip_vs_stats and its procfs
> > Do these need to be updated as well? Looking at these files quickly
> > and with my limited knowledge of the kernel I am not sure if they
> > update the stats in a BH context or not.
We have 2 kinds of readers:
- timer context (ip_vs_est.c): no _bh is used for fetch
- user context (ip_vs_ctl.c): _bh is used for fetch
> > Kevin
> Thanks !
Julian Anastasov <ja@xxxxxx>
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