linux-kernel - Re: heads up: moving intel-pt-decoder/Build header checks to check

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Date:   Wed, 30 May 2018 09:30:50 +0300
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Jiri Olsa <jolsa@...nel.org>, Ingo Molnar <mingo@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-perf-users@...r.kernel.org
Subject: Re: heads up: moving intel-pt-decoder/Build header checks to
 check_headers.sh

On 29/05/18 16:48, Arnaldo Carvalho de Melo wrote:
> Hi Adrian,
> 
> 	We've made tools/perf/check-headers.sh the mechanism to check
> for drift on kernel file copies we have in tools/, and it assumes that
> if we have tools/a/b/c/d, then it came from a/b/c/d in the kernel
> sources, e.g. a copy of the kernel's arch/x86/lib/x86-opcode-map.txt
> would be in tools/arch/x86/lib/x86-opcode-map.txt.
> 
> 	That is not the case with the intel-pt-decoder, so I'm thinking
> about moving those files to comply with the model used for other copies,
> as having it in util/intel-pt-decoder/ isn't strictly required, i.e.
> those files could conceivably be used for other purposes besides
> decoding intel-pt traces, say for disassembly/annotate, that albeit not
> planned (at least by me) for the near future, would be something
> interesting to investigate doing.
> 
> 	IIRC Ingo was the one to point me out this, and now I saw the
> warning about it being different flying by in the middle of the build,
> differently from what is done by check-headers.sh, that is to show
> everything that drifted in one single block, at the start of the build.
> 
> 	So unless you have a strong objection to this, I'll continue
> investigation about how do do it with tools/perf/check-headers.sh,

I have no objection but currently it is (theoretically) possible to compile
Intel PT decoding support into perf script and perf report for any
architecture. i.e. decoding Intel PT from a perf.data file does not depend
on the build architecture.