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    SubjectRe: Mainline kernel OLTP performance update
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    On Fri, 2009-01-16 at 13:14 -0500, Gregory Haskins wrote:
    > Ma, Chinang wrote:
    > > Gregory.
    > > I will test the resched-ipi instrumentation patch with our OLTP if you can post the patch and some instructions.
    > > Thanks,
    > > -Chinang
    > >
    >
    > Hi Chinang,
    > Please find a patch attached which applies to linus.git as of today.
    > You will also want to enable CONFIG_FUNCTION_TRACER as well as the trace
    > components. Here is my system:
    >

    I don't see why CONFIG_FUNCTION_TRACER is needed.

    > ghaskins@dev:~/sandbox/git/linux-2.6-rt> grep TRACE .config
    > CONFIG_STACKTRACE_SUPPORT=y
    > CONFIG_TRACEPOINTS=y
    > CONFIG_HAVE_ARCH_TRACEHOOK=y
    > CONFIG_BLK_DEV_IO_TRACE=y
    > # CONFIG_TREE_RCU_TRACE is not set
    > # CONFIG_PREEMPT_RCU_TRACE is not set
    > CONFIG_X86_PTRACE_BTS=y
    > # CONFIG_ACPI_DEBUG_FUNC_TRACE is not set
    > CONFIG_NETFILTER_XT_TARGET_TRACE=m
    > CONFIG_SOUND_TRACEINIT=y
    > CONFIG_TRACE_IRQFLAGS_SUPPORT=y
    > CONFIG_TRACE_IRQFLAGS=y
    > CONFIG_STACKTRACE=y
    > # CONFIG_BACKTRACE_SELF_TEST is not set
    > CONFIG_USER_STACKTRACE_SUPPORT=y
    > CONFIG_NOP_TRACER=y
    > CONFIG_HAVE_FUNCTION_TRACER=y
    > CONFIG_HAVE_FUNCTION_GRAPH_TRACER=y
    > CONFIG_HAVE_FUNCTION_TRACE_MCOUNT_TEST=y
    > CONFIG_HAVE_DYNAMIC_FTRACE=y
    > CONFIG_HAVE_FTRACE_MCOUNT_RECORD=y
    > CONFIG_HAVE_HW_BRANCH_TRACER=y
    > CONFIG_TRACER_MAX_TRACE=y
    > CONFIG_FUNCTION_TRACER=y
    > CONFIG_FUNCTION_GRAPH_TRACER=y
    > CONFIG_IRQSOFF_TRACER=y
    > CONFIG_SYSPROF_TRACER=y
    > CONFIG_SCHED_TRACER=y

    This CONFIG_SCHED_TRACER should be enough.

    -- Steve

    > CONFIG_CONTEXT_SWITCH_TRACER=y
    > # CONFIG_BOOT_TRACER is not set
    > # CONFIG_TRACE_BRANCH_PROFILING is not set
    > CONFIG_POWER_TRACER=y
    > CONFIG_STACK_TRACER=y
    > CONFIG_HW_BRANCH_TRACER=y
    > CONFIG_DYNAMIC_FTRACE=y
    > CONFIG_FTRACE_MCOUNT_RECORD=y
    > # CONFIG_FTRACE_STARTUP_TEST is not set
    > # CONFIG_MMIOTRACE is not set
    > # CONFIG_KVM_TRACE is not set
    >
    >
    > Then on your booted system, do:
    >
    > echo sched_switch > /sys/kernel/debug/tracing/current_tracer
    > echo 1 > /sys/kernel/debug/tracing/tracing_enabled
    > $run_oltp && echo 0 > /sys/kernel/debug/tracing/tracing_enabled
    >
    > (where $run_oltp is your suite)
    >
    > Then, email the contents of /sys/kernel/debug/tracing/trace to me
    >
    > -Greg
    >



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