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edited May 31, 2012 at 8:17

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contentsContents of /proc/meminfo/proc/meminfo:

MemTotal: 1792540 kB MemFree: 67824 kB Buffers: 17084 kB Cached: 109624 kB SwapCached: 69600 kB Active: 436880 kB Inactive: 245756 kB Active(anon): 402348 kB Inactive(anon): 169616 kB Active(file): 34532 kB Inactive(file): 76140 kB Unevictable: 13456 kB Mlocked: 13456 kB SwapTotal: 1830908 kB SwapFree: 1632380 kB Dirty: 40 kB Writeback: 0 kB AnonPages: 515492 kB Mapped: 46852 kB Shmem: 3308 kB Slab: 875752 kB SReclaimable: 19108 kB SUnreclaim: 856644 kB KernelStack: 2688 kB PageTables: 19468 kB NFS_Unstable: 0 kB Bounce: 0 kB WritebackTmp: 0 kB CommitLimit: 2727176 kB Committed_AS: 1741500 kB VmallocTotal: 34359738367 kB VmallocUsed: 285612 kB VmallocChunk: 34359436336 kB HardwareCorrupted: 0 kB AnonHugePages: 0 kB HugePages_Total: 0 HugePages_Free: 0 HugePages_Rsvd: 0 HugePages_Surp: 0 Hugepagesize: 2048 kB DirectMap4k: 1551232 kB DirectMap2M: 282624 kB

Head of slabtop http://pastebin.com/wSQ5Wst9(by size):

 Active / Total Objects (% used) : 1859056 / 1873931 (99.2%) Active / Total Slabs (% used) : 115960 / 115960 (100.0%) Active / Total Caches (% used) : 76 / 108 (70.4%) Active / Total Size (% used) : 906258.20K / 909988.65K (99.6%) Minimum / Average / Maximum Object : 0.01K / 0.49K / 8.00K OBJS ACTIVE USE OBJ SIZE SLABS OBJ/SLAB CACHE SIZE NAME 1640475 1640475 100% 0.53K 109365 15 874920K idr_layer_cache 4941 4628 93% 0.86K 549 9 4392K ext4_inode_cache 19068 13243 69% 0.19K 908 21 3632K dentry 6034 5325 88% 0.55K 431 14 3448K inode_cache 20272 20272 100% 0.14K 724 28 2896K sysfs_dir_cache

contents of /proc/meminfo: http://pastebin.com/wSQ5Wst9

Contents of /proc/meminfo:

MemTotal: 1792540 kB MemFree: 67824 kB Buffers: 17084 kB Cached: 109624 kB SwapCached: 69600 kB Active: 436880 kB Inactive: 245756 kB Active(anon): 402348 kB Inactive(anon): 169616 kB Active(file): 34532 kB Inactive(file): 76140 kB Unevictable: 13456 kB Mlocked: 13456 kB SwapTotal: 1830908 kB SwapFree: 1632380 kB Dirty: 40 kB Writeback: 0 kB AnonPages: 515492 kB Mapped: 46852 kB Shmem: 3308 kB Slab: 875752 kB SReclaimable: 19108 kB SUnreclaim: 856644 kB KernelStack: 2688 kB PageTables: 19468 kB NFS_Unstable: 0 kB Bounce: 0 kB WritebackTmp: 0 kB CommitLimit: 2727176 kB Committed_AS: 1741500 kB VmallocTotal: 34359738367 kB VmallocUsed: 285612 kB VmallocChunk: 34359436336 kB HardwareCorrupted: 0 kB AnonHugePages: 0 kB HugePages_Total: 0 HugePages_Free: 0 HugePages_Rsvd: 0 HugePages_Surp: 0 Hugepagesize: 2048 kB DirectMap4k: 1551232 kB DirectMap2M: 282624 kB

Head of slabtop (by size):

 Active / Total Objects (% used) : 1859056 / 1873931 (99.2%) Active / Total Slabs (% used) : 115960 / 115960 (100.0%) Active / Total Caches (% used) : 76 / 108 (70.4%) Active / Total Size (% used) : 906258.20K / 909988.65K (99.6%) Minimum / Average / Maximum Object : 0.01K / 0.49K / 8.00K OBJS ACTIVE USE OBJ SIZE SLABS OBJ/SLAB CACHE SIZE NAME 1640475 1640475 100% 0.53K 109365 15 874920K idr_layer_cache 4941 4628 93% 0.86K 549 9 4392K ext4_inode_cache 19068 13243 69% 0.19K 908 21 3632K dentry 6034 5325 88% 0.55K 431 14 3448K inode_cache 20272 20272 100% 0.14K 724 28 2896K sysfs_dir_cache

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asked May 31, 2012 at 7:50

Rena

RAM usage doesn't add up? (Free+used < total)

Lately I've been noticing that my monitoring script which reads from /proc/meminfo and /proc/<pid> has been showing odd readings, where several hundred MB seem to be missing. htop is showing the same discrepancy:

CPU: 36.9% sys: 7.6% low: 0.0% Tasks: 123; 1 running Mem:1750M used:1568M buffers:20M cache:87M Load average: 0.90 1.33 1.33 Swp:1787M used:184M Uptime: 1 day, 00:28:22 PID USER PRI NI VIRT RES SHR S CPU% MEM% TIME+ Command 3455 rena 20 0 1221M 312M 20464 S 14.0 17.8 1h20:26 /usr/lib/firefox/firefox 1428 root 20 0 327M 100M 6236 S 7.0 5.7 1h28:52 /usr/bin/X :0 -auth /var/run/lightdm/root/:0 -nol 14012 rena 20 0 630M 26400 5264 S 0.0 1.5 0:14.20 /usr/bin/python /usr/bin/sonata --toggle 2562 rena 20 0 914M 21100 10904 S 0.0 1.2 3:59.50 xfce4-terminal --role "Terminal" --hide-menubar - 2492 rena 20 0 379M 20528 3312 S 0.0 1.1 0:03.53 pcmanfm --desktop --profile lubuntu

Memory used is 1568M, but the top 5 processes aren't using anywhere near that: 312+100+26+21+20+20(buffers)+87(cache) = 586M. So 982M are missing somewhere?

OS is Lubuntu 12.04 AMD64.

contents of /proc/meminfo: http://pastebin.com/wSQ5Wst9

ubuntu memory