Messages in this thread | | | Date | Thu, 27 Apr 2006 17:57:30 +1000 | From | Nick Piggin <> | Subject | Re: Lockless page cache test results |
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Jens Axboe wrote:
> Things look pretty bad for the lockless kernel though, Nick any idea > what is going on there? The splice change is pretty simple, see the top > three patches here:
Could just be the use of spin lock instead of read lock.
I don't think it would be hard to convert find_get_pages_contig to be lockless.
Patched vanilla numbers look nicer, but I'm curious as to why __do_page_cache was so bad before, if the file was in cache. Presumably it should not more than double tree_lock acquisition... it isn't getting called multiple times for each page, is it?
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