Messages in this thread | | | Date | Sun, 5 Feb 2006 21:26:27 -0800 (PST) | From | Shantanu Goel <> | Subject | Re: [VM PATCH] rotate_reclaimable_page fails frequently |
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--- Andrew Morton <akpm@osdl.org> wrote:
> Rik van Riel <riel@surriel.com> 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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