On Thu, 21 Feb 2013 01:27:25 +0800 Jiang Liu <liuj97@xxxxxxxxx> wrote: > As reported by https://bugzilla.kernel.org/show_bug.cgi?id=53501, > "MemTotal" from /proc/meminfo means memory pages managed by the buddy > system (managed_pages), but "MemTotal" from /sys/.../node/nodex/meminfo > means phsical pages present (present_pages) within the NUMA node. > There's a difference between managed_pages and present_pages due to > bootmem allocator and reserved pages. > > So change /proc/meminfo to report physical memory installed as > "MemTotal", which is > MemTotal = sum(pgdat->present_pages) Documentation/filesystems/proc.txt says MemTotal: Total usable ram (i.e. physical ram minus a few reserved bits and the kernel binary code) And arguably, that is more useful than "total physical memory". Presumably the per-node MemTotals are including kernel memory and reserved memory. Maybe they should be fixed instead (sounds hard). Or maybe we just leave everything as-is and document it carefully. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>