On 3/30/15 1:33 PM, Peter Zijlstra wrote:
On Mon, Mar 30, 2015 at 11:24:12AM -0600, David Ahern wrote:
This works but the result is not always intuitive as to why it failed.
On a kernel that does not support the clock id you get:
$ perf sched record -k mono -- sleep 1
Error:
clockid not supported.
And on a kernel that supports clockid but not for NMI:
$ perf record -k realtime -a -- sleep 1
Error:
clockid not supported.
--> H/W counters so realtime is not allowed
Same message though different root causes.
Heh, ok I can fudge that :-)
What about having the kernel return 'not supported' error for the latter
-- H/W counters with unsafe clock?
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