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Date: Fri, 15 Jan 2016 22:36:44 +0100
From: Peter Zijlstra <peterz@infradead.org>
To: Stephane Eranian <eranian@google.com>
Cc: Ingo Molnar <mingo@kernel.org>, Arnaldo Carvalho de Melo <acme@kernel.org>,
        Namhyung Kim <namhyung@gmail.com>, LKML <linux-kernel@vger.kernel.org>,
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        Adrian Hunter <adrian.hunter@intel.com>,
        "ak@linux.intel.com" <ak@linux.intel.com>
Subject: Re: [RFC] perf record: missing buildid for callstack modules
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On Fri, Jan 15, 2016 at 10:58:48AM -0800, Stephane Eranian wrote:
> then it would be clear what is what, no field with dual meaning.
> Now, that assumes that no pathname can be longer than 65535 bytes.

include/uapi/linux/limits.h:#define PATH_MAX        4096        /* # chars in a path name including nul */

Also, our RECORDS cannot exceed 64k.