On Tue, 12 Feb 2013, Andrew Morton wrote:
> > Summary: Duplicated MemTotal with different values
> > Product: Memory Management
> > Version: 2.5
> > Kernel Version: Ubuntu 3.8.0-4.8-generic 3.8.0-rc6
> > Platform: All
> > OS/Version: Linux
> > Tree: Mainline
> > Status: NEW
> > Severity: normal
> > Priority: P1
> > Component: Other
> > AssignedTo: akpm@xxxxxxxxxxxxxxxxxxxx
> > ReportedBy: sworddragon2@xxxxxxx
> > Regression: No
> >
> >
> > The installed memory on my system is 16 GiB. /proc/meminfo is showing me
> > "MemTotal: 16435048 kB" but /sys/devices/system/node/node0/meminfo is
> > showing me "Node 0 MemTotal: 16776380 kB".
> >
> > My suggestion: MemTotal in /proc/meminfo should be 16776380 kB too. The old
> > value of 16435048 kB could have its own key "MemAvailable".
>
> hm, mine does that too. A discrepancy between `totalram_pages' and
> NODE_DATA(0)->node_present_pages.
>
> I don't know what the reasons are for that but yes, one would expect
> the per-node MemTotals to sum up to the global one.
>
I'd suspect it has something to do with 9feedc9d831e ("mm: introduce new
field "managed_pages" to struct zone") and 3.8 would be the first kernel
release with this change. Is it possible to try 3.7 or, better yet, with
this patch reverted?
If neither of these are the case, or you aren't comfortable building and
booting a custom kernel, please send along your /proc/zoneinfo.
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