[dpdk-dev] About pmu cycle counter usage in armv8
Jia He
hejianet at gmail.com
Mon Dec 11 06:38:25 CET 2017
Hi Jerin
In [1], I met a pmu cycle counter problem (all return value is 0)
occasionally.
And then I submited a patch to kernel maillist, but was rejected by
maintainer at last [2].
He said:
"We only intend for the in-kernel perf infrastructure to access
pmccntr_el0; nothing else should touch it."
So maybe it is not proper for dpdk to use pmu cycle counter?
[1] http://dpdk.org/ml/archives/dev/2017-November/080998.html
[2]https://lkml.org/lkml/2017/11/16/22
--
Cheers,
Jia
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