Messages in this thread |  | | Date | Fri, 26 Oct 2001 19:43:01 +0200 | From | Andrea Arcangeli <> | Subject | Re: Linux 2.4.13-ac1 |
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On Fri, Oct 26, 2001 at 06:35:02PM +0100, Alan Cox wrote: > > Does this mean the ac tree now uses the AA VM, or is this a merge > > with everything but the VM, like the earlier 2.4.1x-ac trees? > > It still uses buffer cache based raw disk access (so things like DVD players
btw, AFIK the fact dvd player can hang some millisecond across a close/open cycle, isn't really because of the blkdev in pagecache but simply because the <2.4.10 buffer cache layer wasn't able to do proper readahead on the blkdev. Now we do readahead properly and so in turn the the lack of media-change trust of the vfs shows up. So as far I can tell the right fix have no influence on the blkdev in pagecache, but it only consists in resurrecting the media-change detection with a per-device bitflag whitelist. I cannot see other source of stalls across a close/open cycle.
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