* Tony Lindgren [off-list ref] [141027 08:56]:

* Paul Walmsley [off-list ref] [141023 08:21]:

quoted

On Mon, 20 Oct 2014, Paul Walmsley wrote:

quoted

Boot-time memory difference
(delta in bytes from test_v3.17-rc7 (fe82dcec644244676d55a1384c958d5f67979adb))
  avail  rsrvd   high  freed  board          kconfig
 -117908k -13164k      .  -148k  2420n800    omap2plus_defconfig_n800_only_a
 -1012k  1012k      .      .  2430sdp        omap2plus_defconfig
 -1268k  1268k      .    16k  3530es31beagle omap2plus_defconfig
 -1268k  1268k      .    16k  3530es3beagle  omap2plus_defconfig
 -1780k  1780k      .    16k  3730beaglexm   omap2plus_defconfig
 -1780k  1780k      .    16k  3730es12beaglexmomap2plus_defconfig
 -1268k  1268k      .    16k  37xxevm        omap2plus_defconfig
 -2780k  2780k -16384k    16k  4460pandaes    omap2plus_defconfig
 -2776k  2776k -16384k    16k  4460varsomom   omap2plus_defconfig
 -4848k  4848k -16384k    16k  5430es2sbct54  omap2plus_defconfig
 -4800k  4800k -16384k    16k  5430es2uevm    omap2plus_defconfig
  -996k   996k      .     8k  am335xbone     omap2plus_defconfig_am33xx_only
 -1268k  1268k      .    16k  am335xbonelt   omap2plus_defconfig


The size of an omap2plus_defconfig kernel has increased by 760K - a 
remarkable increase that fortunately does not appear to be matched by 
runtime memory consumption.

Well let's take that back.  I seem to have glazed over the 1 to 4MB (!) 
runtime memory usage increases in boot memory consumption.  That is also 
an extraordinary increase.

Probably mostly caused by 673ce00c5d6c (ARM: omap2plus_defconfig: Add
support for distros with systemd). But I bet actually at least ipv6
can be a loadable module here, I'll take a look.

Here's a fix that should help quite a bit with ipv6 as a loadable module.

Regards,

Tony

8< ---------------------
From: Tony Lindgren <tony@atomide.com>
Date: Mon, 27 Oct 2014 09:00:21 -0700
Subject: [PATCH] ARM: omap2plus_defconfig: Fix bloat caused by having ipv6 built-in

Commit  673ce00c5d6c (ARM: omap2plus_defconfig: Add support for
distros with systemd) caused considerable bloat as noted by
Paul Walmsley [off-list ref].

Let's fix this issue by making what we can into loadable modules
for the systemd options. That's only IPV6 and AUTOFS4_FS it
seems, and IPv6 defaults to a loadable module.

Reported-by: Paul Walmsley <paul@pwsan.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

diff --git a/arch/arm/configs/omap2plus_defconfig b/arch/arm/configs/omap2plus_defconfig
index 16e719c..3fbad5b 100644
--- a/arch/arm/configs/omap2plus_defconfig
+++ b/arch/arm/configs/omap2plus_defconfig

@@ -86,7 +86,6 @@ CONFIG_IP_PNP_DHCP=y
 CONFIG_IP_PNP_BOOTP=y
 CONFIG_IP_PNP_RARP=y
 # CONFIG_INET_LRO is not set
-CONFIG_IPV6=y
 CONFIG_NETFILTER=y
 CONFIG_CAN=m
 CONFIG_CAN_C_CAN=m

@@ -317,7 +316,7 @@ CONFIG_EXT4_FS=y
 CONFIG_FANOTIFY=y
 CONFIG_QUOTA=y
 CONFIG_QFMT_V2=y
-CONFIG_AUTOFS4_FS=y
+CONFIG_AUTOFS4_FS=m
 CONFIG_MSDOS_FS=y
 CONFIG_VFAT_FS=y
 CONFIG_TMPFS=y