[PATCH] omit CommitAvail

CommitLimit was a good addition to /proc/meminfo, but we don't usually show
both what's used and what's free: don't waste lines of screenspace, omit
CommitAvail, let the user do the arithmetic as with all the others.  And in
updating that Documentation, removed the long-gone ReverseMaps.
Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

Documentation/filesystems/proc.txt

@@ -380,9 +380,7 @@ Mapped:         280372 kB
 Slab:           684068 kB
 CommitLimit:   7669796 kB
 Committed_AS:   100056 kB
-CommitAvail:   7569740 kB
 PageTables:      24448 kB
-ReverseMaps:   1080904
 VmallocTotal:   112216 kB
 VmallocUsed:       428 kB
 VmallocChunk:   111088 kB
@@ -446,20 +444,8 @@ 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.
- CommitAvail: Based on the current overcommit ratio
-              ('vm.overcommit_ratio'), this is the amount of memory
-              currently available to be allocated under the overcommit
-              limit (the CommitLimit above). This is calculated as:
-              CommitAvail = CommitLimit - Committed_AS
-              This limit is only enforced if strict overcommit accounting
-              is enabled (mode 2 in 'vm.overcommit_memory'). CommitAvail
-              may be a negative number if strict accounting is not enabled
-              and the system's memory is currently overcommitted.
-              For more details, see the memory overcommit documentation
-              in vm/overcommit-accounting.
   PageTables: amount of memory dedicated to the lowest level of page
               tables.
- ReverseMaps: number of reverse mappings performed
 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

Documentation/vm/overcommit-accounting

@@ -22,9 +22,8 @@ The overcommit policy is set via the sysctl `vm.overcommit_memory'.
 
 The overcommit percentage is set via `vm.overcommit_ratio'.
 
-The current overcommit limit, amount used, and amount remaining below
-the limit are viewable in /proc/meminfo as CommitLimit, Committed_AS, and
-CommitAvail respectively.
+The current overcommit limit and amount committed are viewable in
+/proc/meminfo as CommitLimit and Committed_AS respectively.
 
 Gotchas
 -------

fs/proc/proc_misc.c

@@ -204,7 +204,6 @@ static int meminfo_read_proc(char *page, char **start, off_t off,
 		"Slab:         %8lu kB\n"
 		"CommitLimit:  %8lu kB\n"
 		"Committed_AS: %8lu kB\n"
-		"CommitAvail:  %8ld kB\n"
 		"PageTables:   %8lu kB\n"
 		"VmallocTotal: %8lu kB\n"
 		"VmallocUsed:  %8lu kB\n"
@@ -228,7 +227,6 @@ static int meminfo_read_proc(char *page, char **start, off_t off,
 		K(ps.nr_slab),
 		K(allowed),
 		K(committed),
-		K(allowed - committed),
 		K(ps.nr_page_table_pages),
 		vmtot,
 		vmi.used,