Messages in this thread | | | From | "Rafael J. Wysocki" <> | Subject | Re: [RFC][PATCH] PM: Force GFP_NOIO during suspend/resume (was: Re: [linux-pm] Memory allocations in .suspend became very unreliable) | Date | Wed, 20 Jan 2010 22:13:23 +0100 |
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On Wednesday 20 January 2010, Oliver Neukum wrote: > Am Dienstag, 19. Januar 2010 21:37:35 schrieb Rafael J. Wysocki: > > That said, Maxim reported that in his test case the mm subsystem apparently > > attempted to use I/O even if there was a plenty of free memory available and > > I'd like prevent that from happening. > > Hi, > > it seems to me that this is caused by the mm subsytem maintaing > a share of clean pages precisely so that GFP_NOIO will work. > Perhaps it is a good idea to > a) launder a number of pages if the system is about to be suspended > between the freezer and notifying drivers
That was tried, didn't work.
> b) set the ration of clean pages to dirty pages to 0 while suspending > the system.
Patch, please?
Rafael
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