* Christoph Hellwig <[email protected]> wrote:
> On Sun, Jan 28, 2007 at 12:51:18PM +0100, Peter Zijlstra wrote:
> > This patch-set breaks up the global file_list_lock which was found
> > to be a severe contention point under basically any filesystem
> > intensive workload.
>
> Benchmarks, please. Where exactly do you see contention for this?
it's the most contended spinlock we have during a parallel kernel
compile on an 8-way system. But it's pretty common-sense as well,
without doing any measurements, it's basically the only global lock left
in just about every VFS workload that doesnt involve massive amount of
dentries created/removed (which is still dominated by the dcache_lock).
> filesystem intensive workload apparently means namespace operation
> heavy workload, right? The biggest bottleneck I've seen with those is
> dcache lock.
the dcache lock is not a problem during kernel compiles. (its
rcu-ification works nicely in that workload)
Ingo
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