linux-kernel - Re: [RFC] perf record: missing buildid for callstack modules

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Message-ID: <20160115213644.GO3421@worktop>
Date:	Fri, 15 Jan 2016 22:36:44 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Namhyung Kim <namhyung@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Jiri Olsa <jolsa@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Adrian Hunter <adrian.hunter@...el.com>,
	"ak@...ux.intel.com" <ak@...ux.intel.com>
Subject: Re: [RFC] perf record: missing buildid for callstack modules

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.