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SubjectRe: scheduler went mad?
On Thu, 12 Apr 2001, Alan Cox wrote:

> > 2.4.3-pre6 quietly made a very significant change there:
> > it used to say "if (!order) goto try_again;" and now just
> > says "goto try_again;". Which seems very sensible since
> > __GFP_WAIT is set, but I do wonder if it was a safe change.
> > We have mechanisms for freeing pages (order 0), but whether
> > any higher orders come out of that is a matter of chance.
>
> The fundamental problem is that it should say
>
> wait_for_mm_progress();
> goto try_again;
>
> and we dont have that facility right now.

From mm/page_alloc.c, around line 453:

if (gfp_mask & __GFP_WAIT) {
memory_pressure++;
try_to_free_pages(gfp_mask);
wakeup_bdflush(0);
goto try_again;
}
I guess we should remove the wakeup_bdflush(0) ... who put it
there anyway ?

regards,

Rik
--
Virtual memory is like a game you can't win;
However, without VM there's truly nothing to lose...

http://www.surriel.com/
http://www.conectiva.com/ http://distro.conectiva.com.br/

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