Messages in this thread |  | | | Subject | Re: OOM fixes 2/5 | | From | Andi Kleen <> | | Date | Fri, 21 Jan 2005 08:08:21 +0100 |
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Andrew Morton <akpm@osdl.org> writes:
> Just that it throws away a bunch of potentially usable memory. In three > years I've seen zero reports of any problems which would have been solved > by increasing the protection ratio.
We ran into a big problem with this on x86-64. The SUSE installer would load the floppy driver during installation. Floppy driver would try to allocate some pages with GFP_DMA and on a small memory x86-64 system (256-512MB) the OOM killer would always start to kill things trying to free some DMA pages. This was quite a show stopper because you effectively couldn't install.
So at least for GFP_DMA it seems to be definitely needed.
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