"Chen, Kenneth W" <[email protected]> wrote:
>
> Andrew Morton wrote on Friday, March 24, 2006 6:54 PM
> > "Chen, Kenneth W" <[email protected]> wrote:
> > >
> > > Mark Rustad wrote on Friday, March 24, 2006 9:52 AM
> > > > I have narrowed this down to DEBUG_PAGEALLOC. If that option is
> > > > enabled, attempts to reference areas mmap-ed from hugetlbfs files
> > > > fault forever. You can see that I had that set in the failing config
> > > > I reported below.
> > >
> > > Yeah, it turns out that the debug option is not compatible with hugetlb
> > > page support. That debug option turns off PSE. Once it is turned off in
> > > CR4, cpu will ignore pse bit in the pmd and causing infinite page-not-
> > > present fault :-(
> >
> > I wonder if any of the other architectures which implement both these
> > features might have problems too.
>
>
> Only 32-bit x86 arch implements both. We get away by not having DEBUG_PAGEALLOC
> feature on any other arch.
OK, thanks.
> ...
> I was going to verify that on my ia32 box, but apparently, turning on
> 64G highmem gives me machine reset at boot. (is it a known regression?)
Works OK here.
quad:/home/akpm> cat /proc/meminfo
MemTotal: 7251348 kB
MemFree: 7180680 kB
Buffers: 18868 kB
Cached: 20980 kB
SwapCached: 0 kB
Active: 32100 kB
Inactive: 14440 kB
HighTotal: 6422528 kB
HighFree: 6390924 kB
LowTotal: 828820 kB
LowFree: 789756 kB
SwapTotal: 4000040 kB
SwapFree: 4000040 kB
Dirty: 128 kB
Writeback: 0 kB
Mapped: 10112 kB
Slab: 11352 kB
CommitLimit: 7625712 kB
Committed_AS: 15292 kB
PageTables: 520 kB
VmallocTotal: 118776 kB
VmallocUsed: 2180 kB
VmallocChunk: 116356 kB
HugePages_Total: 0
HugePages_Free: 0
HugePages_Rsvd: 0
Hugepagesize: 2048 kB
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