Messages in this thread | | | Date | Sat, 25 Mar 2006 00:15:19 -0800 | From | Andrew Morton <> | Subject | Re: 2.6.16 hugetlbfs problem - DEBUG_PAGEALLOC |
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"Chen, Kenneth W" <kenneth.w.chen@intel.com> wrote: > > Andrew Morton wrote on Friday, March 24, 2006 6:54 PM > > "Chen, Kenneth W" <kenneth.w.chen@intel.com> 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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