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Date: Mon, 30 Mar 2015 13:41:12 -0600 From: David Ahern <dsahern@...il.com> To: Peter Zijlstra <peterz@...radead.org> CC: Stephane Eranian <eranian@...gle.com>, Arnaldo Carvalho de Melo <acme@...hat.com>, Thomas Gleixner <tglx@...utronix.de>, Jiri Olsa <jolsa@...hat.com>, Linus Torvalds <torvalds@...ux-foundation.org>, LKML <linux-kernel@...r.kernel.org>, John Stultz <john.stultz@...aro.org>, "H. Peter Anvin" <hpa@...or.com>, Andrew Morton <akpm@...ux-foundation.org>, Ingo Molnar <mingo@...nel.org> Subject: Re: [PATCH] perf, record: Add clockid parameter 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? -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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