Re: [VM PATCH] rotate_reclaimable_page fails frequently

[Shantanu Goel]

--- Andrew Morton <akpm@xxxxxxxx> wrote:

> Rik van Riel <riel@xxxxxxxxxxx> wrote:
> >  The question is, why is the page not yet back on
> the
> >  LRU by the time the data write completes ?
> 
> Could be they're ext3 pages which were written out
> by kjournald.  Such
> pages are marked dirty but have clean buffers. 
> ext3_writepage() will
> discover that the page is actually clean and will
> mark it thus without
> performing any I/O.
> 

I had conjectured that something like this might be
happening without knowing the details of how ext3
implements writepage.  The filesystem tested on here
is  ext3.

> Shantanu, I suggest you add some instrumentation
> there too, see if it's
> working.  (That'll be non-trivial.  Just because we
> hit PAGE_CLEAN: here
> doesn't necessarily mean that the page will be
> reclaimed).

I'll do so and report back the results.

Shantanu


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