linux-kernel - Re: [PATCH v0 07/71] perf tools: Record whether a dso is 64-bit

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Date:	Thu, 12 Dec 2013 09:45:26 -0700
From:	David Ahern <dsahern@...il.com>
To:	Adrian Hunter <adrian.hunter@...el.com>
CC:	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
	Frederic Weisbecker <fweisbec@...il.com>,
	Jiri Olsa <jolsa@...hat.com>, Mike Galbraith <efault@....de>,
	Namhyung Kim <namhyung@...il.com>,
	Paul Mackerras <paulus@...ba.org>,
	Stephane Eranian <eranian@...gle.com>,
	Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH v0 07/71] perf tools: Record whether a dso is 64-bit

On 12/12/13, 5:05 AM, Adrian Hunter wrote:

>>> diff --git a/tools/perf/util/dso.h b/tools/perf/util/dso.h
>>> index 384f2d9..62680e1 100644
>>> --- a/tools/perf/util/dso.h
>>> +++ b/tools/perf/util/dso.h
>>> @@ -91,6 +91,7 @@ struct dso {
>>>        u8         annotate_warned:1;
>>>        u8         sname_alloc:1;
>>>        u8         lname_alloc:1;
>>> +    u8         is_64_bit:1;
>>
>> The is_64_bit name seems a bit hardcoded. We need something similar for
>> perf-trace to set the audit machine type for resolving syscalls. How about
>> having this field set a machine type rather than a "64-bit" flag?
>
> I am not sure what you mean by "machine type".  For itrace the
> implementation only deals with its own architecture (e.g. the intel_pt
> pmu is only on Intel architecture) so it is not necessary to record
> the architecture.
>
> is_64_bit corresponds to ELFCLASS64 (vs ELFCLASS32) which is needed
> to determine whether the instruction set is 64-bit.  That should
> work for other architectures too.
>

perf-trace needs something similar -- an audit machine type to know how 
to convert syscall numbers to functions. One of the following per task:

typedef enum {
     MACH_X86=0,
     MACH_86_64,
     MACH_IA64,
     MACH_PPC64,
     MACH_PPC,
     MACH_S390X,
     MACH_S390,
     MACH_ALPHA,
     MACH_ARMEB
} machine_t;

I was pondering how the 2 can be combined into a common flag.

David
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