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Date: Fri, 14 Sep 2012 05:43:42 -0600 From: David Ahern <dsahern@...il.com> To: Ingo Molnar <mingo@...nel.org> CC: acme@...stprotocols.net, linux-kernel@...r.kernel.org, peterz@...radead.org, Robert Richter <robert.richter@....com> Subject: Re: [PATCH 3/3 v2] perf tool: give user better message if precise is not supported On 9/14/12 5:36 AM, Ingo Molnar wrote: > Well, then that is useful information we *lost*, and that > situation needs to be improved on the ABI side: an expanded > error code present in the event structure, copied back to > user-space on errors, or so. > > (Alternatively, a special event channel just to pass back > expanded error conditions.) > > Computers are supposed to make life easier for humans, by > answering such "what did go wrong?" questions. Our losing of > precise error conditions is a usability bug really - and in the > perf project we are in a unique position to be able to improve > both the kernel side code and make immediate use of it on the > tooling side as well. Understood and there have been suggestions on how to definitely state what the kernel side did not like. I like Peter's last suggestion -- something along the lines of clearing attr on a failure except the offending setting. David -- 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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