From f86a69b15f60965a224e7e2516ad41070692cc19 Mon Sep 17 00:00:00 2001 From: Wu Zhangjin Date: Sun, 31 Jan 2010 20:39:40 +0800 Subject: MIPS: Make the debugging of compressed kernel configurable This patch adds a new DEBUG_ZBOOT option to allow the users to enable it to debug the compressed kernel support for a new board and this optoin should be disabled to reduce the kernel image size and speed up the kernel booting procedure when the compressed kernel support is stable. Signed-off-by: Wu Zhangjin To: Ralf Baechle Cc: Manuel Lauss Cc: linux-mips@linux-mips.org Patchwork: http://patchwork.linux-mips.org/patch/918/ Signed-off-by: Ralf Baechle --- arch/mips/Kconfig.debug | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) (limited to 'arch/mips/Kconfig.debug') diff --git a/arch/mips/Kconfig.debug b/arch/mips/Kconfig.debug index d2b88a0be519..32a010d5edb9 100644 --- a/arch/mips/Kconfig.debug +++ b/arch/mips/Kconfig.debug @@ -102,4 +102,23 @@ config RUNTIME_DEBUG arch/mips/include/asm/debug.h for debugging macros. If unsure, say N. +config DEBUG_ZBOOT + bool "Enable compressed kernel support debugging" + depends on DEBUG_KERNEL && SYS_SUPPORTS_ZBOOT + default n + help + If you want to add compressed kernel support to a new board, and the + board supports uart16550 compatible serial port, please select + SYS_SUPPORTS_ZBOOT_UART16550 for your board and enable this option to + debug it. + + If your board doesn't support uart16550 compatible serial port, you + can try to select SYS_SUPPORTS_ZBOOT and use the other methods to + debug it. for example, add a new serial port support just as + arch/mips/boot/compressed/uart-16550.c does. + + After the compressed kernel support works, please disable this option + to reduce the kernel image size and speed up the booting procedure a + little. + endmenu -- cgit v1.2.3 From bba90760582d2563b28a4738fb785185a59e9e71 Mon Sep 17 00:00:00 2001 From: David Daney Date: Tue, 16 Feb 2010 15:26:35 -0800 Subject: MIPS: Crazy spinlock speed test. This is just a test program for raw_spinlocks. The main reason I wrote it is to validate my spinlock changes that I sent in a previous patch. To use it enable CONFIG_DEBUG_FS and CONFIG_SPINLOCK_TEST then at run time do: # mount -t debugfs none /sys/kernel/debug/ # cat /sys/kernel/debug/mips/spin_single # cat /sys/kernel/debug/mips/spin_multi On my 600MHz octeon cn5860 (16 CPUs) I get spin_single spin_multi base 106885 247941 spinlock_patch 75194 219465 This shows that for uncontended locks the spinlock patch gives 41% improvement and for contended locks 12% improvement (1/time). Signed-off-by: David Daney To: linux-mips@linux-mips.org Patchwork: http://patchwork.linux-mips.org/patch/969/ Signed-off-by: Ralf Baechle --- arch/mips/Kconfig.debug | 7 +++++++ 1 file changed, 7 insertions(+) (limited to 'arch/mips/Kconfig.debug') diff --git a/arch/mips/Kconfig.debug b/arch/mips/Kconfig.debug index 32a010d5edb9..43dc27997730 100644 --- a/arch/mips/Kconfig.debug +++ b/arch/mips/Kconfig.debug @@ -121,4 +121,11 @@ config DEBUG_ZBOOT to reduce the kernel image size and speed up the booting procedure a little. +config SPINLOCK_TEST + bool "Enable spinlock timing tests in debugfs" + depends on DEBUG_FS + default n + help + Add several files to the debugfs to test spinlock speed. + endmenu -- cgit v1.2.3