On Mon, 2010-02-01 at 17:14 +0100, Stephane Eranian wrote:
> Using perfmon on Core 2 on a 10s noploop:
>
> pfmon -eunhalted_reference_cycles,unhalted_core_cycles,cpu_clk_unhalted:bus
> noploop 10
> noploop for 10 seconds
> 23869090125 UNHALTED_REFERENCE_CYCLES
> 23849336873 UNHALTED_CORE_CYCLES
> 2652122099 CPU_CLK_UNHALTED:BUS
Weird, I used:
while :; do :; done &
while :; do :; done &
while :; do :; done &
while :; do :; done &
perf stat -a -e r013c -e r013c sleep 4
killall bash
Which gives:
Performance counter stats for 'sleep 4':
244235699509090 raw 0x13c
244235695558036 raw 0x13c
4.005485333 seconds time elapsed
And verified it used fixed counter 2 and general purpose counter 0 using
sysrq-p.
[523417.108402] CPU#0: gen-PMC0 ctrl: 000000000053013c
[523417.108403] CPU#0: gen-PMC0 count: 000000ff80019948
[523417.108405] CPU#0: gen-PMC0 left: 000000007fffffff
[523417.108407] CPU#0: gen-PMC1 ctrl: 0000000000000000
[523417.108409] CPU#0: gen-PMC1 count: 0000000000000000
[523417.108411] CPU#0: gen-PMC1 left: 000000007fffb8a8
[523417.108412] CPU#0: fixed-PMC0 count: 0000000000000000
[523417.108414] CPU#0: fixed-PMC1 count: 0000000000000000
[523417.108416] CPU#0: fixed-PMC2 count: 0000010db1db2117
Using -linus, since that doesn't have any of the recent constraint
patches in that would avoid us from using fixed-PMC2.
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