diff options
| author | David Daney <ddaney@caviumnetworks.com> | 2010-02-16 15:26:35 -0800 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2010-02-27 12:53:42 +0100 |
| commit | bba90760582d2563b28a4738fb785185a59e9e71 (patch) | |
| tree | b1efda424d8ab0ef24220ce4da484819d749e2b2 /arch/mips/Kconfig.debug | |
| parent | 500c2e1fdbcc2b273bd4c695a9b8ac8196f61614 (diff) | |
| download | blackbird-obmc-linux-bba90760582d2563b28a4738fb785185a59e9e71.tar.gz blackbird-obmc-linux-bba90760582d2563b28a4738fb785185a59e9e71.zip | |
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 <ddaney@caviumnetworks.com>
To: linux-mips@linux-mips.org
Patchwork: http://patchwork.linux-mips.org/patch/969/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/Kconfig.debug')
| -rw-r--r-- | arch/mips/Kconfig.debug | 7 |
1 files changed, 7 insertions, 0 deletions
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 |
