Re: x86/mm: Limit 2/4M size calculation to x86_32
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On 07/13/2012 11:12 AM, Yinghai Lu wrote:
The hang is merely the effect of limited memory getting even more limited and running out of it while trying to uncompress your initramfs and/or kernel is not helping.On Fri, Jul 13, 2012 at 6:41 AM, Stefan Bader <stefan.bader@xxxxxxxxxxxxx> wrote:I was bisecting a problem on 64bit where any attempt to cause a crash kernel to boot would hang. The bisect ended up on commit 722bc6b (x86/mm: Fix the size calculation of mapping tables) and somehow, looking at the calling function and the ranges printed on boot, I think the calculations should only be done in the 32bit case. On 64bit: [ 0.000000] init_memory_mapping: [mem 0x00000000-0x77e87fff] [ 0.000000] [mem 0x00000000-0x77dfffff] page 2M [ 0.000000] [mem 0x77e00000-0x77e87fff] page 4k Attached patch would fix this if you agree with it. Thanks.it does not look like for the hang for your system. maybe just because it change a bit memblock allocation layout.
I am traveling this week and have no access to the machine. But basically you can see the issue relatively simple. As 64bit does not have the first 2/4M area as 4k pages. So with the current state of the patch this would allocate extra space of about 3MB for the first range (about 1.9GB). Again the problem is not something bad going on beyond the fact that it wastes memory and it just happens to be more than it used to be, so the memory set aside for getting it to boot suddenly failed to be enough.can you please post whole boot log that is working and not?
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