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Subjectmaps2-make-proc-pid-smaps-optional-under-config_embedded.patch
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Date
Matt wrote:
> This interface is primarily useful for doing memory profiling and not much use
> on deployed embedded boxes. Make it optional. Together with
> /proc/pid/clear_refs, this save a few K.

How about a single config option for all these?

===
maps2-CONFIG_PROC_PAGE_MONITOR.patch

Merge the three config options PROC_SMAPS/PROC_CLEAR_REFS/PROC_PAGEMAP
and report the approximate memory usage (i386 SMP).

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

diff -r 5a7ada4f5442 init/Kconfig
--- a/init/Kconfig Sun Jul 08 15:29:26 2007 +1000
+++ b/init/Kconfig Sun Jul 08 16:01:35 2007 +1000
@@ -636,32 +636,14 @@ config SLOB

endchoice

-config PROC_SMAPS
- default y
- bool "Enable /proc/pid/smaps support" if EMBEDDED && PROC_FS && MMU
- help
- The /proc/pid/smaps interface reports a process's private and
- shared memory per mapping. Disabling this interface will reduce
- the size of the kernel for small machines.
-
-config PROC_CLEAR_REFS
- default y
- bool "Enable /proc/pid/clear_refs support" if EMBEDDED && PROC_FS && MMU
- help
- The /proc/pid/clear_refs interface allows clearing the
- referenced bits on a process's memory maps to allow monitoring
- working set size. Disabling this interface will reduce
- the size of the kernel for small machines.
-
-config PROC_PAGEMAP
- default y
- bool "Enable /proc/pid/pagemap support" if EMBEDDED && PROC_FS && MMU
- help
- The /proc/pid/pagemap interface allows reading the
- kernel's virtual memory to page frame mapping to determine which
- individual pages a process has mapped and which pages it shares
- with other processes. Disabling this interface will reduce the
- size of the kernel for small machines.
+config PROC_PAGE_MONITOR
+ default y
+ bool "Enable /proc page monitoring" if EMBEDDED && PROC_FS && MMU
+ help
+ Various /proc files exist to monitor process memory utilization:
+ /proc/pid/smaps, /proc/pid/clear_refs and /proc/pid/pagemap.
+ Disabling these interfaces will reduce the size of the kernel by
+ approximately 4kb.

config PROC_KPAGEMAP
default y
@@ -670,7 +652,7 @@ config PROC_KPAGEMAP
The /proc/pid/kpagemap interface allows reading the
kernel's per-page flag and usage counts to gather precise
information on page-level memory usage. Disabling this interface
- will reduce the size of the kernel for small machines.
+ will reduce the size of the kernel by around 600 bytes.

endmenu # General setup


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