On Thu, 14 Feb 2013, Jiang Liu wrote: > > Hmm, ok. The question is which one is right: the per-node MemTotal is the > > amount of present RAM, the spanned range minus holes, and the system > > MemTotal is the amount of pages released to the buddy allocator by > > bootmem and discounts not only the memory holes but also reserved pages. > > Should they both be the amount of RAM present or the amount of unreserved > > RAM present? > > > Hi David, > We have worked out a patch set to address this issue. The first two > patches have been merged into v3.8, and another two patches are queued in > Andrew's mm tree for v3.9. > The patch set introduces a new field named managed_pages into struct > zone to distinguish between pages present in a zone and pages managed by the > buddy system. So > zone->present_pages = zone->spanned_pages - pages_in_hole; > zone->managed_pages = pages_managed_by_buddy_system_in_the_zone; > We have also added a field named "managed" into /proc/zoneinfo, but > haven't touch /proc/meminfo and /sys/devices/system/node/nodex/meminfo yet. > If preferred, we could work out another patch to enhance these two files > as suggested above. I'm glad this is a known issue that you're working on, but my question still stands: if MemTotal is going to be consistent throughout /proc/meminfo and /sys/devices/system/node/nodeX/meminfo, which is correct? The present RAM minus holes or the amount available to the buddy allocator not including reserved memory? -- 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>