Hi, all I'm playing with memory cgroup, I'm a bit confused why memory.usage in bytes is steadily increasing at 4K page pace after every mmap/dirty/unmap sequence. On linux-3.6.34.10/linux-3.3.0-rc5 A simple test case does following: a) mmap 128k memory in private anonymous way b) dirty all 128k to demand physical page c) print memory.usage_in_bytes <-- increased at 4K after every loop d) unmap previous 128 memory e) goto a) to repeat And when the test case exit, memory.usage_in_bytes is not *ZERO*, but the previous increased value. I'm puzzled about what I saw, can anyone please give me some tips to understand this? Thanks in advance. -- Love each day! --bill -- 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/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>