Re: Block device swamping disk cache

From: marcus hall
Date: Wed May 12 2004 - 08:43:56 EST

On Tue, May 11, 2004 at 05:26:43PM -0700, Andrew Morton wrote:
> no, sorry, it'll still happen. I haven't fixed the ramdisk driver yet.
> The problem is that ->memory_backed means both "doesn't contribute
> to dirty memory" and also "doesn't need writeback".
> These concepts need to be split apart for the ramdisk driver. I'll do it
> for 2.6.7, promise.

Well, I believe that the inodes that are marked as memory_backed are
for the ramdisk, and that isn't really a problem. The block device
that I am writing to is a compact flash, so it's going through the ide-disk
device. I do not see this inode show up on any superblock's dirty queue
(since it doesn't appear that mark_inode_dirty() is being called for
it). So the question I am asking is, what strategy is *supposed* to be
in place to flush the blocks out? (Or is this a hole that isn't plugged?)

Marcus Hall
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