Re: [PATCH 17/18] writeback: fix dirtied pages accounting onredirty

[Christoph Hellwig]

On Wed, Sep 07, 2011 at 06:42:16PM +0200, Jan Kara wrote:
>   Well, it depends on what you call common - usually, ->writepage is called
> from kswapd which shouldn't be common compared to writeback from a flusher
> thread. But now I've realized that JBD2 also calls ->writepage to fulfill
> data=ordered mode guarantees and that's what causes most of redirtying of
> pages on ext4. That's going away eventually but it will take some time. So
> for now writeback has to handle redirtying...

Under the "right" loads it may also happen for xfs because we can't
take lock non-blockingly in the fluser thread for example.

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