Re: [VM PATCH 2.6.6-rc3-bk5] Dirty balancing in the presence of mappedpages

[Nick Piggin]

Andrew Morton wrote:
> Shantanu Goel <sgoel01@xxxxxxxxx> wrote:
>
> > Presently the kernel does not collection information
> > about the percentage of memory that processes have
> > dirtied via mmap until reclamation.  Nothing analogous
> > to balance_dirty_pages() is being done for mmap'ed
> > pages.  The attached patch adds collection of dirty
> > page information during kswapd() scans and initiation
> > of background writeback by waking up bdflush.
>
>
> And what were the effects of this patch?

I havea modified patch from Nikita that does the
if (ptep_test_and_clear_dirty) set_page_dirty from
page_referenced, under the page_table_lock.

So it also picks up pages coming off the active list.

It doesn't do the wakeup_bdflush thing, but that sounds
like a good idea. What does wakeup_bdflush(-1) mean?

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