On Tue, Feb 15, 2011 at 11:55:10AM -0500, Eric B Munson wrote: > I am noticing in smaps that KernelPageSize is wrong of areas > that have been merged into THP. For instance: > > 7ff852a00000-7ff852c00000 rw-p 00000000 00:00 0 > Size: 2048 kB > Rss: 2048 kB > Pss: 2048 kB > Shared_Clean: 0 kB > Shared_Dirty: 0 kB > Private_Clean: 0 kB > Private_Dirty: 2048 kB > Referenced: 2048 kB > Anonymous: 2048 kB > AnonHugePages: 2048 kB > Swap: 0 kB > KernelPageSize: 4 kB > MMUPageSize: 4 kB > Locked: 0 kB > > The entire mapping is contained in a THP but the > KernelPageSize shows 4kb. For cases where the mapping might > have mixed page sizes this may be okay, but for this > particular mapping the 4kb page size is wrong. I'm not sure this is a bug, if the mapping grows it may become 4096k but the new pages may be 4k. There's no such thing as a vma_mmu_pagesize in terms of hugepages because we support graceful fallback and collapse/split on the fly without altering the vma. So I think 4k is correct here. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>