Messages in this thread | | | Date | Mon, 24 Sep 2007 18:54:11 +0100 | From | Christoph Hellwig <> | Subject | Re: [PATCH 24/25] r/o bind mounts: track number of mount writers |
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As we already say in various messages the percpu counters in here look rather fishy. I'd recomment to take a look at the per-cpu superblock counters in XFS as they've been debugged quite well now and could probably be lifted into a generic library for this kind of think. The code is mostly in fs/xfs/xfs_mount.c can can be spotted by beeing under #ifdef HAVE_PERCPU_SB.
It also handles cases like hotplug cpu nicely that this code seems to work around by always iterating over all possible cpus which might not be nice on a dual core laptop with a distro kernel that also has to support big iron.
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