Yes, the core_pcbe_program processes all cfgs in list one by one. In my sample,
there are 2 cfgs, "clk" and "rma" in cfg-list. The core_pcbe_program will
program
them all. So in kcpc_hw_overflow_intr, though the overflow bitmap skip the
counters which are not overflow, but the core_pcbe_program will still reset
them.
That's the problem.
Thanks
Jin Yao
> > 2 4073 core_pcbe_program:wrmsr C1
> 281474976710555(0xFFFFFFFFFF9B)
> That line shows the rma counter being reset to
> MAX-100.
>
> pcbe_configure() will update the pcbe_config with the
> value that has to
> be written to the counter. That is correctly done
> here for the clk
> counter that overflowed.
>
> The pcbe_config for the rma counter still has the
> initial value of
> MAX-100, so on the subsequent pcbe_program() call
> when all active
> counters are programmed, MAX-100 will be written to
> the rma counter.
>
> On 06/17/10 23:57, Jin Yao wrote:
> > Hi kuriakose,
> >
> > There was no cpc sampling job when my dtrace
> scripts (test_clk_rma.d or test_rma.d) running.
> > I tried your test script, it didn't hook the
> function core_pcbe_sample.
> > eg: some pieces from trace log.
> >
> > 2 4076 core_pcbe_overflow_bitmap:rdmsr 38E
> 17179869184(0x400000000)
> > 2 4074 core_pcbe_overflow_bitmap:wrmsr 390
> 17179869184(0x400000000)
> > 2 4072 core_pcbe_allstop:wrmsr 38F
> 0(0x0)
> > 2 4072 core_pcbe_allstop:wrmsr 38F
> 0(0x0)
> > 2 4073 core_pcbe_program:wrmsr 390
> 13835058085346934799(0xC00000070000000F)
> > 2 4073 core_pcbe_program:wrmsr C1
> 281474976710555(0xFFFFFFFFFF9B)
> > 2 4073 core_pcbe_program:wrmsr 186
> 5443599(0x53100F)
> > 2 4073 core_pcbe_program:wrmsr 30B
> 281474975710655(0xFFFFFFF0BDBF)
> > 2 4073 core_pcbe_program:wrmsr 38D
> 2816(0xB00)
> > 2 4073 core_pcbe_program:wrmsr 38F
> 17179869185(0x400000001)
> >
> > Another question is I checked the codes of
> kcpc_hw_overflow_intr,
> > one bitmap indicates which counters get overflow.
> And the function
> > will not reset the counter when the related bit in
> bitmap is not set.
> >
> > bitmap = pcbe_ops->pcbe_overflow_bitmap();
> > if (dtrace_cpc_in_use) {
> > /* Reset any counters that have overflowed */
> > for (i = 0; i< ctx->kc_set->ks_nreqs; i++) {
> > req = ctx->kc_set->ks_req[i];
> > if (bitmap& (1<< req.kr_picnum)) {
> >
> pcbe_ops->pcbe_configure(req.kr_picnum,
> req.kr_event, req.kr_preset,
> req.kr_flags, req.kr_nattrs,
> req.kr_attr,&(req.kr_config),
> (void *)ctx);
> > }
> >
> > pcbe_ops->pcbe_program(ctx);
> > return (DDI_INTR_CLAIMED);
> > }
> >
> > So it looks like the rma counter will not be reset
> to initial value when the clk counter overflows.
> > Correct me if I'm wrong.
> >
> > Thanks
> > Jin Yao
> _______________________________________________
> perf-discuss mailing list
> [email protected]
>
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