Re: [RFC][PATCH] PM: Force GFP_NOIO during suspend/resume (was: Re: [linux-pm] Memory allocations in .suspend became very unreliable)

Rafael J. Wysocki
2010-01-17T23:00:19Z

On Sunday 17 January 2010, Benjamin Herrenschmidt wrote:
> On Sun, 2010-01-17 at 14:27 +0100, Rafael J. Wysocki wrote:
...
> However, it's hard to deal with the case of allocations that have
> already started waiting for IOs. It might be possible to have some VM
> hook to make them wakeup, re-evaluate the situation and get out of that
> code path but in any case it would be tricky.

In the second version of the patch I used an rwsem that made us wait for these
allocations to complete before we changed gfp_allowed_mask.

[This is kinda buggy in the version I sent, but I'm going to send an update
in a minute.]

Rafael