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authorJens Axboe <axboe@suse.de>2006-05-01 19:59:03 +0200
committerJens Axboe <axboe@suse.de>2006-05-01 19:59:03 +0200
commitf84d751994441292593523c7069ed147176f6cab (patch)
treea1a0c4836289df86bb62e7eae5c80c66fca1643a /Documentation/usb/auerswald.txt
parent0568b409c74f7a125d92a09a3f386785700ef688 (diff)
[PATCH] pipe: introduce ->pin() buffer operation
The ->map() function is really expensive on highmem machines right now, since it has to use the slower kmap() instead of kmap_atomic(). Splice rarely needs to access the virtual address of a page, so it's a waste of time doing it. Introduce ->pin() to take over the responsibility of making sure the page data is valid. ->map() is then reduced to just kmap(). That way we can also share a most of the pipe buffer ops between pipe.c and splice.c Signed-off-by: Jens Axboe <axboe@suse.de>
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