linux-kernel - Re: [PATCH v4 3/5] perf: script: add field 'disasm' to display mnemonic instructions

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Date: Mon, 22 Jan 2024 05:41:42 -0800
From: Andi Kleen <ak@...ux.intel.com>
To: Changbin Du <changbin.du@...wei.com>
Cc: Adrian Hunter <adrian.hunter@...el.com>,
	Mark Rutland <mark.rutland@....com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Jiri Olsa <jolsa@...nel.org>, Namhyung Kim <namhyung@...nel.org>,
	Ian Rogers <irogers@...gle.com>, linux-kernel@...r.kernel.org,
	linux-perf-users@...r.kernel.org,
	Thomas Richter <tmricht@...ux.ibm.com>, changbin.du@...il.com,
	Peter Zijlstra <peterz@...radead.org>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Ingo Molnar <mingo@...hat.com>
Subject: Re: [PATCH v4 3/5] perf: script: add field 'disasm' to display
 mnemonic instructions

> > >>
> > > Updated as:
> > > 
> > > 	When doing instruction trace decoding, insn, disasm and insnlen give the
> > > 	instruction bytes, disassembled instructions and the instruction length
> > > 	of the current instruction respectively.
> > 
> > I wondered about mentioning that disasm needs perf to be compiled with
> > disassembler support, but with a permissive license it seems likely
> > that libcapstone support would generally be built into perf, so that
> > should be fine.
> > 
> Yes, libcapstone has a permissive license. It's available on most Linux distros.

What I've seen in the past is that people who build perf from source
often miss installing all the build the dependencies because perf continues
without an error. Make sure that if that happens and someone uses the option
there is a clear message that points to the build process.

-Andi