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Message-ID: <4CC8C7BE.4010102@caviumnetworks.com> Date: Wed, 27 Oct 2010 17:45:50 -0700 From: David Daney <ddaney@...iumnetworks.com> To: Ted Ts'o <tytso@....edu>, Arnaldo Carvalho de Melo <acme@...hat.com>, linux-kernel@...r.kernel.org Subject: Re: Perf can't deal with many tracepoints On 10/27/2010 05:40 PM, Ted Ts'o wrote: > On Wed, Oct 27, 2010 at 05:16:18PM -0700, David Daney wrote: >> Tracing is supposed to be low overhead. Forcing people to decode >> things like this at the trace point, may take more code and cause >> the trace data to be larger, making it slower than necessary. >> >> If there isn't a good reason to keep perf stupid, then making it >> smarter could be attractive. > > Agreed. Although one argument against making perf smarter is that > certain things such as the dev_t MAJOR/MINOR split is an internal > abstraction that could potentially vary from kernel to kernel. > > And the question is whether perf really should be so different that if > you boot a different kernel, you had better have the right perf > installed. > It may be possible to encode the dev_t split in the trace meta-data. This is done for some other types. Then perf could decode it based on the meta-data. Another option is to have perf print the raw data and not crash. Then someone looking at the output could, if they desired, decode the dev_t themselves. David Daney -- 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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