[perf-discuss] Can dtrace cpc provider support 2+ probes?

[Jin Yao]

I write 2 dtrace scripts in order to measure "clk" and "rma" for sytem workload 
on nhm-ex (32 cores) when specjbb2005 runs. 

r...@shz-os:~# ./test_clk_rma.d 
......................
clk
           309547
rma
               32
kcpc_int
           309579
......................
clk
           309931
rma
               57
kcpc_int
           309985
......................
clk
           310158
rma
               25
kcpc_int
           310183
^C

r...@shz-os:~# ./test_rma.d 
............
rma
             1531
kcpc_int
             1531
............
rma
             1645
kcpc_int
             1645
............
rma
             1537
kcpc_int
             1537

I find the "rma" in test_clk_rma.d output is smaller than the "rma" 
from test_rma.d. I guess some overflow interrupts lost when the dtrace
script test_clk_rma.d runs. But if it's true, why most of time are in 
user space not in system space (from the output of vmstat and mpstat)?

The script sources are bellow and I also changed the setting to 
"dcpc-min-overflow=100;" in "/kernel/drv/dcpc.conf" before tests.

r...@shz-os:~# cat test_clk_rma.d 
#!/usr/sbin/dtrace -s

#pragma D option quiet

cpc:::cpu_clk_unhalted.ref-all-1000000
{
        @clk = count();
}

cpc:::mem_uncore_retired.remote_dram-all-100
{
        @rma = count();
}

kcpc_hw_overflow_intr:entry
{
        @kcpc_int = count();
}

tick-5s
{
        printf("......................\n");
        printf("clk");
        printa(@clk);
        trunc(@clk);
        printf("rma");
        printa(@rma);
        trunc(@rma);
        printf("kcpc_int");
        printa(@kcpc_int);
        trunc(@kcpc_int);
}

r...@shz-os:~# cat test_rma.d 
#!/usr/sbin/dtrace -s

#pragma D option quiet

cpc:::mem_uncore_retired.remote_dram-all-100
{
        @rma = count();
}

kcpc_hw_overflow_intr:entry
{
        @kcpc_int = count();
}

tick-5s
{
        printf("............\n");
        printf("rma");
        printa(@rma);
        trunc(@rma);
        printf("kcpc_int");
        printa(@kcpc_int);
        trunc(@kcpc_int);
}

Can anybody give me some suggestions?

Thanks
Jin Yao
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