As I read from http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/Document... (line 906) *the Shmem field in /proc/meminfo: Total memory used by shared memory
(shmem) and tmpfs*
tmpfs size: /proc # df -Thk |grep -E "tmpfs|Used" Filesystem Type 1K-blocks Used Available Use% Mounted on devtmpfs devtmpfs 1963344 8 1963336 1% /dev tmpfs tmpfs 2027904 728 2027176 1% /dev/shm tmpfs tmpfs 2027904 9936 2017968 1% /run tmpfs tmpfs 2027904 0 2027904 0% /sys/fs/cgroup *total (tmpfs) size: 8+ 728 + 9936 = 10672 kB* shared mem by ipc /proc # ipcs -mu ------ Shared Memory Status -------- segments allocated 23 pages allocated 1855 pages resident 1855 pages swapped 0 Swap performance: 0 attempts 0 successes /proc # getconf PAGESIZE 4096 -->ipcs shared mem = 1855 * 4096/1024 = 7420kB *> 7420kB (ipcs mem) + 10672 (tmpfs) = 18092 Kb* ** /proc # cat /proc/meminfo |grep ShmemShmem: 18096 kB which is different from Shmem in meminfo 4Kb could you help me about "where is 4Kb located?" Thank you so much