Re: Mainline kernel OLTP performance update

[Steven Rostedt]

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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