Christoph Lameter wrote:
For Itanium (and I guess also for ppc64 and sparch64) the performance of
write_lock/unlock is the same as spin_lock/unlock. There is at least
one case where concurrent reads would be allowed without this patch.
Yep, I picked up another one that was easy to make lockless (I'll send
out a new patchset soon), however the tagged lookup that was under read
lock is changed to a spin lock.
It shouldn't be too difficult to make the tag lookups (find_get_pages_tag)
lockless, however I just haven't gotten around to looking at the write
side of the tagging yet.
When that is done, there should be no more read locks at all.
Nick
--
SUSE Labs, Novell Inc.
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