Messages in this thread | | | Date | Fri, 26 Feb 2010 17:01:09 +1100 | From | Nick Piggin <> | Subject | Re: Nick's vfs-scalability patches ported to 2.6.33-rt |
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On Thu, Feb 25, 2010 at 09:53:28PM -0800, john stultz wrote: > Hey Thomas, Nick, > I just wanted to let you know I've just finished forward porting Nick's > patches to 2.6.33-rc8-rt2. Luckily my forward port of Nick's patches to > 2.6.33 applies on top of the -rt tree without any collisions, and I've > added a handful of maybe sketchy fixups to get it working with -rt. > > You can find the patchset here: > http://sr71.net/~jstultz/dbench-scalability/patches/2.6.33-rc8-rt2/vfs-scale.33-rt.tar.bz2 > > Here's a chart showing how much these patches help dbench numbers on > ramfs: > http://sr71.net/~jstultz/dbench-scalability/graphs/2.6.33/ramfs-dbench.png > > I've not done any serious stress testing with the patchset yet, but > wanted to post it for your review. > > Nick: I'd appreciate any feedback as to if any of my forward porting has > gone awry. I'm still very green with respect to the vfs, so I don't > doubt there are some issues hiding here.
BTW there are a few issues Al pointed out. We have to synchronize RCU after unregistering a filesystem so d_ops/i_ops doesn't go away, and mntput can sleep so we can't do it under RCU read lock.
The store-free path walk patches don't really have the required RCU barriers in them either (which is fine for x86, but would have to be fixed).
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