On Friday, September 03, 2010, KOSAKI Motohiro wrote: > Hello, > > > > > > Like in the patch below, perhaps? > > > > > > > > Looks like fine. but I have one question. hibernate_preallocate_memory() call > > > > preallocate_image_memory() two times. Why do you only care latter one? > > > > former one seems similar risk. > > > > > > The first one is mandatory, ie. if we can't allocate the requested number of > > > pages at this point, we fail the entire hibernation. In that case the > > > performance hit doesn't matter. > > > > IOW, your patch at http://lkml.org/lkml/2010/9/2/262 is still necessary to > > protect against the infinite loop in that case. > > As far as I understand, we need distinguish two allocation failure. > 1) failure because no enough memory > -> yes, hibernation should fail > 2) failure because already allocated enough lower zone memory > -> why should we fail? > > If the system has a lot of memory, scenario (2) is happen frequently than (1). > I think we need check alloc_highmem and alloc_normal variable and call > preallocate_image_highmem() again instead preallocate_image_memory() > if we've alread allocated enough lots normal memory. > > nit? Actually I thought about that, but we don't really see hibernation fail for this reason. In all of the tests I carried out the requested 50% of highmem had been allocated before allocations from the normal zone started to be made, even if highmem was 100% full at that point. So this appears to be a theoretical issue and covering it would require us to change the algorithm entirely (eg. it doesn't make sense to call preallocate_highmem_fraction() down the road if that happens). Thanks, Rafael _______________________________________________ linux-pm mailing list linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/linux-pm
