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Message-ID: <CABPqkBRmpnMNH16_HNWWHFn8dDtTE+jRjunkLDpc30SnA8_oYA@mail.gmail.com> Date: Fri, 16 Sep 2011 16:44:44 +0200 From: Stephane Eranian <eranian@...gle.com> To: Peter Zijlstra <peterz@...radead.org> Cc: David Ahern <dsahern@...il.com>, linux-kernel@...r.kernel.org, acme@...hat.com, mingo@...e.hu Subject: Re: [PATCH] perf: make perf.data more self-descriptive (v4) On Fri, Sep 16, 2011 at 4:37 PM, Peter Zijlstra <peterz@...radead.org> wrote: > On Fri, 2011-09-16 at 16:35 +0200, Stephane Eranian wrote: >> On Mon, Sep 12, 2011 at 4:43 PM, Peter Zijlstra <peterz@...radead.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. We agree on that. I am just saying the MAGIC string as it is today may not be enough to tell us that. > > > -- 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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