• David Daney's avatar
    MIPS: Crazy spinlock speed test. · bba90760
    David Daney authored
    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: default avatarDavid Daney <ddaney@caviumnetworks.com>
    To: linux-mips@linux-mips.org
    Patchwork: http://patchwork.linux-mips.org/patch/969/Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
    bba90760
Kconfig.debug 4.6 KB