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Message-Id: <1481825556-17182-1-git-send-email-abrodkin@synopsys.com>
Date:   Thu, 15 Dec 2016 21:12:36 +0300
From:   Alexey Brodkin <Alexey.Brodkin@...opsys.com>
To:     linux-snps-arc@...ts.infradead.org
Cc:     linux-kernel@...r.kernel.org,
        Vineet Gupta <Vineet.Gupta1@...opsys.com>,
        Alexey Brodkin <Alexey.Brodkin@...opsys.com>
Subject: [PATCH] arc: nsim: clean-up defconfigs

Stand-alone nSIM platform has the only peripheral which is serial port.
That means support of networking and mice makes no sense for it.

Moreover removal of networking alone gives us 2 nice benefits:
 1. Build happens faster
    On my machine I'm seeing this:
       Existing defconfig:
         real	2m37.887s
         user	8m22.077s
         sys	0m35.995s

       New defconfig:
         real	1m35.351s
         user	5m11.988s
         sys	0m25.211s

    Which gives us ~60% speed-up.

 2. Memory footprint is smaller:
    arc-linux-size vmlinux.org
      text	   data	    bss	    dec	    hex	filename
      5829381	 798756	 257280	6885417	 691029	vmlinux.org

    arc-linux-size vmlinux.new
      text	   data	    bss	    dec	    hex	filename
      4426769	 526348	 225244	5178361	 4f03f9	vmlinux.new

Though this has one down-side - UNIX sockets are disabled an so on
attempt to run hackbench by default user will see:
--------------------->8-------------------
hackbench
Running in process mode with 10 groups using 40 file descriptors each
(== 400 tasks)
Each sender will pass 100 messages of 100 bytes
Creating fdpair (error: Function not implemented)
--------------------->8-------------------

Still it's possible to ask hackbench to use pipes instead like this:
--------------------->8-------------------
hackbench -p
Running in process mode with 10 groups using 40 file descriptors each
(== 400 tasks)
Each sender will pass 100 messages of 100 bytes
Time: 9.216
--------------------->8-------------------

Signed-off-by: Alexey Brodkin <abrodkin@...opsys.com>
---
 arch/arc/configs/nsim_700_defconfig    | 16 +---------------
 arch/arc/configs/nsim_hs_defconfig     | 13 +------------
 arch/arc/configs/nsim_hs_smp_defconfig | 12 +-----------
 3 files changed, 3 insertions(+), 38 deletions(-)

diff --git a/arch/arc/configs/nsim_700_defconfig b/arch/arc/configs/nsim_700_defconfig
index b0066a749d4c..80bd8faecb95 100644
--- a/arch/arc/configs/nsim_700_defconfig
+++ b/arch/arc/configs/nsim_700_defconfig
@@ -2,7 +2,6 @@
 CONFIG_DEFAULT_HOSTNAME="ARCLinux"
 # CONFIG_SWAP is not set
 CONFIG_SYSVIPC=y
-CONFIG_POSIX_MQUEUE=y
 # CONFIG_CROSS_MEMORY_ATTACH is not set
 CONFIG_HIGH_RES_TIMERS=y
 CONFIG_IKCONFIG=y
@@ -27,22 +26,12 @@ CONFIG_ARC_PLAT_SIM=y
 CONFIG_ARC_BUILTIN_DTB_NAME="nsim_700"
 CONFIG_PREEMPT=y
 # CONFIG_COMPACTION is not set
-CONFIG_NET=y
-CONFIG_PACKET=y
-CONFIG_UNIX=y
-CONFIG_UNIX_DIAG=y
-CONFIG_NET_KEY=y
-CONFIG_INET=y
-# CONFIG_IPV6 is not set
 CONFIG_DEVTMPFS=y
 # CONFIG_STANDALONE is not set
 # CONFIG_PREVENT_FIRMWARE_BUILD is not set
 # CONFIG_FIRMWARE_IN_KERNEL is not set
 # CONFIG_BLK_DEV is not set
-CONFIG_NETDEVICES=y
-CONFIG_ARC_EMAC=y
-CONFIG_LXT_PHY=y
-# CONFIG_INPUT_MOUSEDEV_PSAUX is not set
+# CONFIG_INPUT_MOUSEDEV is not set
 # CONFIG_INPUT_KEYBOARD is not set
 # CONFIG_INPUT_MOUSE is not set
 # CONFIG_SERIO is not set
@@ -55,11 +44,8 @@ CONFIG_SERIAL_ARC_CONSOLE=y
 # CONFIG_HID is not set
 # CONFIG_USB_SUPPORT is not set
 # CONFIG_IOMMU_SUPPORT is not set
-CONFIG_EXT2_FS=y
-CONFIG_EXT2_FS_XATTR=y
 CONFIG_TMPFS=y
 # CONFIG_MISC_FILESYSTEMS is not set
-CONFIG_NFS_FS=y
 # CONFIG_ENABLE_WARN_DEPRECATED is not set
 # CONFIG_ENABLE_MUST_CHECK is not set
 # CONFIG_DEBUG_PREEMPT is not set
diff --git a/arch/arc/configs/nsim_hs_defconfig b/arch/arc/configs/nsim_hs_defconfig
index ebe9ebb92933..ad8e7e53ab26 100644
--- a/arch/arc/configs/nsim_hs_defconfig
+++ b/arch/arc/configs/nsim_hs_defconfig
@@ -2,7 +2,6 @@
 CONFIG_DEFAULT_HOSTNAME="ARCLinux"
 # CONFIG_SWAP is not set
 CONFIG_SYSVIPC=y
-CONFIG_POSIX_MQUEUE=y
 # CONFIG_CROSS_MEMORY_ATTACH is not set
 CONFIG_HIGH_RES_TIMERS=y
 CONFIG_IKCONFIG=y
@@ -31,19 +30,12 @@ CONFIG_ISA_ARCV2=y
 CONFIG_ARC_BUILTIN_DTB_NAME="nsim_hs"
 CONFIG_PREEMPT=y
 # CONFIG_COMPACTION is not set
-CONFIG_NET=y
-CONFIG_PACKET=y
-CONFIG_UNIX=y
-CONFIG_UNIX_DIAG=y
-CONFIG_NET_KEY=y
-CONFIG_INET=y
-# CONFIG_IPV6 is not set
 CONFIG_DEVTMPFS=y
 # CONFIG_STANDALONE is not set
 # CONFIG_PREVENT_FIRMWARE_BUILD is not set
 # CONFIG_FIRMWARE_IN_KERNEL is not set
 # CONFIG_BLK_DEV is not set
-# CONFIG_INPUT_MOUSEDEV_PSAUX is not set
+# CONFIG_INPUT_MOUSEDEV is not set
 # CONFIG_INPUT_KEYBOARD is not set
 # CONFIG_INPUT_MOUSE is not set
 # CONFIG_SERIO is not set
@@ -56,11 +48,8 @@ CONFIG_SERIAL_ARC_CONSOLE=y
 # CONFIG_HID is not set
 # CONFIG_USB_SUPPORT is not set
 # CONFIG_IOMMU_SUPPORT is not set
-CONFIG_EXT2_FS=y
-CONFIG_EXT2_FS_XATTR=y
 CONFIG_TMPFS=y
 # CONFIG_MISC_FILESYSTEMS is not set
-CONFIG_NFS_FS=y
 # CONFIG_ENABLE_WARN_DEPRECATED is not set
 # CONFIG_ENABLE_MUST_CHECK is not set
 # CONFIG_DEBUG_PREEMPT is not set
diff --git a/arch/arc/configs/nsim_hs_smp_defconfig b/arch/arc/configs/nsim_hs_smp_defconfig
index 4bde43278be6..d0e609e26bfb 100644
--- a/arch/arc/configs/nsim_hs_smp_defconfig
+++ b/arch/arc/configs/nsim_hs_smp_defconfig
@@ -30,19 +30,12 @@ CONFIG_SMP=y
 CONFIG_ARC_BUILTIN_DTB_NAME="nsim_hs_idu"
 CONFIG_PREEMPT=y
 # CONFIG_COMPACTION is not set
-CONFIG_NET=y
-CONFIG_PACKET=y
-CONFIG_UNIX=y
-CONFIG_UNIX_DIAG=y
-CONFIG_NET_KEY=y
-CONFIG_INET=y
-# CONFIG_IPV6 is not set
 CONFIG_DEVTMPFS=y
 # CONFIG_STANDALONE is not set
 # CONFIG_PREVENT_FIRMWARE_BUILD is not set
 # CONFIG_FIRMWARE_IN_KERNEL is not set
 # CONFIG_BLK_DEV is not set
-# CONFIG_INPUT_MOUSEDEV_PSAUX is not set
+# CONFIG_INPUT_MOUSEDEV is not set
 # CONFIG_INPUT_KEYBOARD is not set
 # CONFIG_INPUT_MOUSE is not set
 # CONFIG_SERIO is not set
@@ -55,10 +48,7 @@ CONFIG_SERIAL_ARC_CONSOLE=y
 # CONFIG_HID is not set
 # CONFIG_USB_SUPPORT is not set
 # CONFIG_IOMMU_SUPPORT is not set
-CONFIG_EXT2_FS=y
-CONFIG_EXT2_FS_XATTR=y
 CONFIG_TMPFS=y
 # CONFIG_MISC_FILESYSTEMS is not set
-CONFIG_NFS_FS=y
 # CONFIG_ENABLE_WARN_DEPRECATED is not set
 # CONFIG_ENABLE_MUST_CHECK is not set
-- 
2.7.4

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