maps4: make page monitoring /proc file optional

Make /proc/ page monitoring configurable

This puts the following files under an embedded config option:

/proc/pid/clear_refs
/proc/pid/smaps
/proc/pid/pagemap
/proc/kpagecount
/proc/kpageflags

[akpm@linux-foundation.org: Kconfig fix]
Signed-off-by: Matt Mackall <mpm@selenic.com>
Cc: Dave Hansen <haveblue@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 10 insertions, 0 deletions

diff --git a/init/Kconfig b/init/Kconfig
index dc28836d9d00..aaa7e7d5305e 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -678,6 +678,16 @@ config MARKERS
 
 source "arch/Kconfig"
 
+config PROC_PAGE_MONITOR
+        default y
+        depends on PROC_FS && MMU
+        bool "Enable /proc page monitoring" if EMBEDDED
+        help
+          Various /proc files exist to monitor process memory utilization:
+          /proc/pid/smaps, /proc/pid/clear_refs, /proc/pid/pagemap,
+          /proc/kpagecount, and /proc/kpageflags. Disabling these
+          interfaces will reduce the size of the kernel by approximately 4kb.
+
 endmenu         # General setup
 
 config SLABINFO