Re: [patchset] Lockfree fd lookup 0 of 5

David S. Miller
2004-08-02T23:16:49Z

On Mon, 2 Aug 2004 14:01:19 -0700
William Lee Irwin III <wli@holomorphy.com> wrote:

> I've found unusual results in this area. e.g. it does appear to matter
> for mapping->tree_lock for database workloads that heavily share a
> given file and access it in parallel. The radix tree walk, though
> intuitively short, is long enough to make the rwlock a win in the
> database-oriented uses and microbenchmarks starting around 4x.

Thanks for the data point, because I had this patch I had sent
to Rusty for 2.7.x which ripped rwlocks entirely out of the
kernel. We might have to toss that idea :-)