Re: [PATCH RFC] mm: Implement balance_dirty_pages() through waiting for flusher thread

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On Tue, Jun 22, 2010 at 10:31:24PM +0800, Christoph Hellwig wrote:
> On Tue, Jun 22, 2010 at 09:52:34PM +0800, Wu Fengguang wrote:
> > 2) most writeback will be submitted by one per-bdi-flusher, so no worry
> >    of cache bouncing (this also means the per CPU counter error is
> >    normally bounded by the batch size)
> 
> What counter are we talking about exactly?  Once balanance_dirty_pages

bdi_stat(bdi, BDI_WRITTEN) introduced in this patch.

> stops submitting I/O the per-bdi flusher thread will in fact be
> the only thing submitting writeback, unless you count direct invocations
> of writeback_single_inode. 

Right. 

Thanks,
Fengguang
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