Messages in this thread | ![/](/images/icornerl.gif) | | Date | Thu, 27 Apr 2006 18:02:49 +1000 | From | Nick Piggin <> | Subject | Re: Lockless page cache test results |
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Nick Piggin wrote: > 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?
Hmm, what's more, find_get_pages_contig shouldn't result in any fewer tree_lock acquires than the open coded thing there now (for the densely populated pagecache case).
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