mm: document missing fields for /proc/meminfo

[linux-2.6-omap-h63xx.git] / Documentation / filesystems / proc.txt

diff --git a/Documentation/filesystems/proc.txt b/Documentation/filesystems/proc.txt
index 5681e2fa1496167e6f876b6dab39e9605597a117..dbc3c6a3650f5c29b24000d69e1c9cb7973b4988 100644 (file)
--- a/Documentation/filesystems/proc.txt
+++ b/Documentation/filesystems/proc.txt
@@ -43,6 +43,7 @@ Table of Contents
   2.13 /proc/<pid>/oom_score - Display current oom-killer score
   2.14 /proc/<pid>/io - Display the IO accounting fields
   2.15 /proc/<pid>/coredump_filter - Core dump filtering settings
+  2.16 /proc/<pid>/mountinfo - Information about mounts
 
 ------------------------------------------------------------------------------
 Preface
@@ -462,11 +463,17 @@ SwapTotal:           0 kB
 SwapFree:            0 kB
 Dirty:             968 kB
 Writeback:           0 kB
+AnonPages:      861800 kB
 Mapped:         280372 kB
-Slab:           684068 kB
+Slab:           284364 kB
+SReclaimable:   159856 kB
+SUnreclaim:     124508 kB
+PageTables:      24448 kB
+NFS_Unstable:        0 kB
+Bounce:              0 kB
+WritebackTmp:        0 kB
 CommitLimit:   7669796 kB
 Committed_AS:   100056 kB
-PageTables:      24448 kB
 VmallocTotal:   112216 kB
 VmallocUsed:       428 kB
 VmallocChunk:   111088 kB
@@ -502,8 +509,17 @@ VmallocChunk:   111088 kB
               on the disk
        Dirty: Memory which is waiting to get written back to the disk
    Writeback: Memory which is actively being written back to the disk
+   AnonPages: Non-file backed pages mapped into userspace page tables
       Mapped: files which have been mmaped, such as libraries
         Slab: in-kernel data structures cache
+SReclaimable: Part of Slab, that might be reclaimed, such as caches
+  SUnreclaim: Part of Slab, that cannot be reclaimed on memory pressure
+  PageTables: amount of memory dedicated to the lowest level of page
+              tables.
+NFS_Unstable: NFS pages sent to the server, but not yet committed to stable
+             storage
+      Bounce: Memory used for block device "bounce buffers"
+WritebackTmp: Memory used by FUSE for temporary writeback buffers
  CommitLimit: Based on the overcommit ratio ('vm.overcommit_ratio'),
               this is the total amount of  memory currently available to
               be allocated on the system. This limit is only adhered to
@@ -530,8 +546,6 @@ Committed_AS: The amount of memory presently allocated on the system.
               above) will not be permitted. This is useful if one needs
               to guarantee that processes will not fail due to lack of
               memory once that memory has been successfully allocated.
-  PageTables: amount of memory dedicated to the lowest level of page
-              tables.
 VmallocTotal: total size of vmalloc memory area
  VmallocUsed: amount of vmalloc area which is used
 VmallocChunk: largest contigious block of vmalloc area which is free
@@ -1506,13 +1520,13 @@ laptop_mode
 -----------
 
 laptop_mode is a knob that controls "laptop mode". All the things that are
-controlled by this knob are discussed in Documentation/laptop-mode.txt.
+controlled by this knob are discussed in Documentation/laptops/laptop-mode.txt.
 
 block_dump
 ----------
 
 block_dump enables block I/O debugging when set to a nonzero value. More
-information on block I/O debugging is in Documentation/laptop-mode.txt.
+information on block I/O debugging is in Documentation/laptops/laptop-mode.txt.
 
 swap_token_timeout
 ------------------
@@ -2348,4 +2362,41 @@ For example:
   $ echo 0x7 > /proc/self/coredump_filter
   $ ./some_program
 
+2.16   /proc/<pid>/mountinfo - Information about mounts
+--------------------------------------------------------
+
+This file contains lines of the form:
+
+36 35 98:0 /mnt1 /mnt2 rw,noatime master:1 - ext3 /dev/root rw,errors=continue
+(1)(2)(3)   (4)   (5)      (6)      (7)   (8) (9)   (10)         (11)
+
+(1) mount ID:  unique identifier of the mount (may be reused after umount)
+(2) parent ID:  ID of parent (or of self for the top of the mount tree)
+(3) major:minor:  value of st_dev for files on filesystem
+(4) root:  root of the mount within the filesystem
+(5) mount point:  mount point relative to the process's root
+(6) mount options:  per mount options
+(7) optional fields:  zero or more fields of the form "tag[:value]"
+(8) separator:  marks the end of the optional fields
+(9) filesystem type:  name of filesystem of the form "type[.subtype]"
+(10) mount source:  filesystem specific information or "none"
+(11) super options:  per super block options
+
+Parsers should ignore all unrecognised optional fields.  Currently the
+possible optional fields are:
+
+shared:X  mount is shared in peer group X
+master:X  mount is slave to peer group X
+propagate_from:X  mount is slave and receives propagation from peer group X (*)
+unbindable  mount is unbindable
+
+(*) X is the closest dominant peer group under the process's root.  If
+X is the immediate master of the mount, or if there's no dominant peer
+group under the same root, then only the "master:X" field is present
+and not the "propagate_from:X" field.
+
+For more information on mount propagation see:
+
+  Documentation/filesystems/sharedsubtree.txt
+
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