Messages in this thread | | | From | "Stephen C. Tweedie" <> | Date | Fri, 26 Nov 1999 23:21:43 +0000 (GMT) | Subject | Re: 2.3.29: ramdisk still broken. |
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Hi,
On Thu, 25 Nov 1999 06:17:39 +0100 (CET), Mike Galbraith <mikeg@weiden.de> said:
> The way I see it, the ramdisk used to work by making it's data persistent > in the buffer cache. Today, data doesn't live in the buffer cache, it > lives in the page cache. Ergo, the task at hand is to figure out how > to make data in the page cache persistent rather than copying that data > back and forth.
No. It needs to do more than just behave as an in-memory filesystem: it needs to behave like a block device. That means that buffer cache aliases of page cache data still need to work: you need to be able to run dump or fsck on the ramdisk of a mounted filesystem, for example. Using a ramdisk to test fs utilities is a legitimate use, and if you move the ramdisk out of the buffer cache it will just break this (as well as polluting the page cache semantics).
--Stephen
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