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
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