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Date: Thu, 19 Nov 2015 12:28:50 +0100 From: Peter Zijlstra <peterz@...radead.org> To: "Wangnan (F)" <wangnan0@...wei.com> Cc: Ingo Molnar <mingo@...nel.org>, Jiri Olsa <jolsa@...nel.org>, Arnaldo Carvalho de Melo <acme@...nel.org>, David Ahern <dsahern@...il.com>, Milian Wolff <milian.wolff@...b.com>, linux-kernel@...r.kernel.org, pi3orama <pi3orama@....com>, lizefan 00213767 <lizefan@...wei.com> Subject: Re: [BUG REPORT] perf tools: x86_64: Broken calllchain when sampling taken at 'callq' instruction On Thu, Nov 19, 2015 at 06:43:14PM +0800, Wangnan (F) wrote: > Also, why not fixing rsp in kernel if that instruction is a 'callq'? > For avoiding instruction decoding? Why would the kernel do that? It doesn't need this. Have userspace do it when trying to interpret the data. If PERF_EFLAGS_EXACT is set, you know the IP points to the actual instruction and you can attempt to undo whatever parts of it you need at post processing time. -- 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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