Re: [PATCH] mm: fix page_mkclean_one

From: Andrew Morton
Date: Thu Dec 28 2006 - 14:46:51 EST

On Thu, 28 Dec 2006 11:28:52 -0800 (PST)
Linus Torvalds <torvalds@xxxxxxxx> wrote:

> On Thu, 28 Dec 2006, Guillaume Chazarain wrote:
> >
> > The attached patch fixes the corruption for me.
> Well, that's a good hint, but it's really just a symptom. You effectively
> just made the test-program not even try to flush the data to disk, so the
> page cache would stay in memory, and you'd not see the corruption as well.
> So you basically disabled the code that tried to trigger the bug more
> easily.
> But the reason I say it's interesting is that "WB_SYNC_NONE" is very much
> implicated in mm/page-writeback.c, and if there is a bug triggered by
> WB_SYNC_NONE writebacks, then that would explain why page-writeback.c also
> fails..

It would be interesting to convert your app to do fsync() before
FADV_DONTNEED. That would take WB_SYNC_NONE out of the picture as well
(apart from pdflush activity).

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