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SubjectRe: [PATCH] perf: make perf.data more self-descriptive (v4)
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On Fri, 2011-09-16 at 16:35 +0200, Stephane Eranian wrote:
> On Mon, Sep 12, 2011 at 4:43 PM, Peter Zijlstra <peterz@infradead.org> wrote:
> > On Mon, 2011-09-12 at 16:40 +0200, Stephane Eranian wrote:
> >> I don't think this should be the test to detect endianess.
> >
> > You should be able to tell the endianness from the PERF_MAGIC string, it
> > stores the string as a u64, so depending on endianness it reads back as
> > either: PERFFILE or ELIFFREP or whatever the bswap64 result is.
> >
>
> I believe in big endian, if you do od -c perf.data | head -1, you also see:
>
> 0000000 P E R F F I L E h \0 \0 \0 \0 \0 \0 \0

Sure, but all you need to know is if the file you're reading is a
different endian than your box, if it is swap stuff, if its not, you're
good.




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