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Re: Name cache locking issue?
On Fri, Apr 11, 2008 at 04:21:17PM -0700, Jason Thorpe wrote:
> On Apr 11, 2008, at 8:25 AM, Andrew Doran wrote:
> >Module Name: src
> >Committed By: ad
> >Date: Fri Apr 11 15:25:24 UTC 2008
> >Modified Files:
> > src/sys/kern: kern_cpu.c vfs_cache.c
> > src/sys/sys: cpu_data.h namei.src
> >Log Message:
> >Restructure the name cache code to eliminate most lock contention
> >resulting from forward lookups. Discussed on tech-kern@.
> Hm, is cache_lock_cpus() safe if CPU_INFO_ITERATOR() happens to return
> the CPUs in a different order on different CPUs?
A quick check shows that they all start from the same point (the first CPU)
so it should be OK. I guess we should document that somewhere, and maybe get
rid of the MD macro altogether.
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