Messages in this thread | | | Subject | Re: [PATCH] virtio-net: fix a race on 32bit arches | From | Eric Dumazet <> | Date | Wed, 06 Jun 2012 22:00:00 +0200 |
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On Wed, 2012-06-06 at 19:57 +0300, Michael S. Tsirkin wrote:
> So for virtio since all counters get incremented from bh we can > ensure they are read atomically, simply but reading them > from the correct CPU with bh disabled. > And then we don't need u64_stats_sync at all. >
Really ? How are you going to read 64bit stats from foreign cpus on 32bit arches, without additional cost in fast path ?
You should read include/linux/u64_stats_sync.h to fully understand the issues.
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