Messages in this thread | | | Date | Tue, 24 Jun 2008 10:05:57 +0200 | From | Jens Axboe <> | Subject | Re: [rfc patch 4/4] splice: use do_generic_file_read() |
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On Sat, Jun 21 2008, Miklos Szeredi wrote: > From: Miklos Szeredi <mszeredi@suse.cz> > > __generic_file_splice_read() duplicates a lot of stuff common with the > generic page cache reading. So reuse that code instead to simplify > the page cache splice code. > > This also fixes some corner cases which weren't properly handled in > the splice code because of complexity issues. In particular it fixes > a problem when the filesystem (e.g. fuse) invalidates pages during the > splice operation. > > There might be some slight fall in performance due to the removal of > the gang lookup for pages. However I'm not sure if this is > significant enough to warrant the extra complication.
This makes everything sync, it's a no go. Why don't we look into fixing the invalidate problem that fuse sees (can you elaborate on that?)?
I tried to do a quick performance test with your patches for comparison in the cached case, but it crashes immediately in spd_release_page()
-- Jens Axboe
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