Re: [RFC PATCH 0/6] Do not call ->writepage[s] from direct reclaimand use a_ops->writepages() where possible

From: Christoph Hellwig
Date: Tue Jun 08 2010 - 05:08:20 EST

On Tue, Jun 08, 2010 at 10:02:19AM +0100, Mel Gorman wrote:
> seeky patterns. The second is that direct reclaim calling the filesystem
> splices two potentially deep call paths together and potentially overflows
> the stack on complex storage or filesystems. This series is an early draft
> at tackling both of these problems and is in three stages.

Btw, one more thing came up when I discussed the issue again with Dave

- we also need to care about ->releasepage. At least for XFS it
can end up in the same deep allocator chain as ->writepage because
it does all the extent state conversions, even if it doesn't
start I/O. I haven't managed yet to decode the ext4/btrfs codepaths
for ->releasepage yet to figure out how they release a page that
covers a delayed allocated or unwritten range.

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