Re: [PATCH v8]: Hibernation: lower/better control the amount of pages used for buffering

Bojan Smojver
2012-04-10T02:25:58Z

On Sun, 2012-04-08 at 10:14 +1000, Bojan Smojver wrote:
> Please ignore this request. As it turns out, the hangs are still
> there, it just takes a bit longer to trigger.

Thanks to Per Olofsson, who actually determined what was going on, we
now know what the problem is.

My "free pages" maths used nr_free_pages() macro, which deals with all
free pages. However, we only allocate buffers from non-high zones. So,
on systems where there is a significant number of high pages free, we
get a very large number (even if only a quarter is used), which then
gets the kernel into a bind and eventually hangs it on page allocation.

Will send a patch shortly, which will also have some other fixes.

--
Bojan