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    SubjectRe: [PATCH 8/8] vm: Add an tuning knob for vm.max_writeback_mb
    On Wed, Sep 09 2009, Wu Fengguang wrote:
    > On Wed, Sep 09, 2009 at 08:28:06PM +0800, Christoph Hellwig wrote:
    > > On Wed, Sep 09, 2009 at 05:29:01PM +0800, Wu Fengguang wrote:
    > > > It seems that balance_dirty_pages() is not coupled with MAX_WRITEBACK_PAGES.
    > > > Instead it uses the much smaller (ratelimit_pages + ratelimit_pages / 2).
    > >
    > > With Jen's writeback patches applied balance_dirty_pages does not start
    > > writeback itself anymore but calls bdi_start_writeback to let the
    > > flusher thread do it.
    > >
    > > it would be good if we do any writeback tuning ontop of these patches..
    >
    > Ah OK. I'm using latest linux-next and expected his patches to be there..

    They are there, have been for months! But I think Christoph is a little
    confused, we'll still do writeback inline from balance_dirty_pages(). It
    does writeback_inodes_wbc(), which does not schedule async writeout.

    So if your patches are based and tested off -next, you should be good.

    --
    Jens Axboe



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