Re: [PATCH 5/6] vmscan: Write out ranges of pages contiguous to theinode where possible

From: Christoph Hellwig
Date: Fri Jun 11 2010 - 12:28:00 EST

On Thu, Jun 10, 2010 at 11:10:45PM -0700, Andrew Morton wrote:
> I did this, umm ~8 years ago and ended up reverting it because it was
> complex and didn't seem to buy us anything. Of course, that was before
> we broke the VM and started writing out lots of LRU pages. That code
> was better than your code - it grabbed the address_space and did
> writearound around the target page.

> Or don't take a look - we shouldn't need to do any of this anyway.

Doing nearly 100% of the writepage from the flusher threads would
also be preferable from the filesystem point of view - getting I/O
from one thread helps to make it more local and work around all the
stupid I/O controller logic that tries to make our life difficult.

Of course getting rid of ->writepage from the AOPs API one day would
also be nice to simplify the filesystems code, but it's not that
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