linux-kernel - Re: [RFC] perf: mmap2 not covering VM

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Message-ID: <20131008093638.GO3081@twins.programming.kicks-ass.net>
Date:	Tue, 8 Oct 2013 11:36:38 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	Kees Cook <keescook@...omium.org>, Ingo Molnar <mingo@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"mingo@...e.hu" <mingo@...e.hu>,
	"ak@...ux.intel.com" <ak@...ux.intel.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	David Ahern <dsahern@...il.com>, Jiri Olsa <jolsa@...hat.com>,
	Hugh Dickins <hughd@...gle.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [RFC] perf: mmap2 not covering VM_CLONE regions

On Tue, Oct 08, 2013 at 09:15:30AM +0200, Stephane Eranian wrote:
> Yes, it is but I am trying to see whether or not we could unify that and
> use a single u64 number to uniquely identify each mapping.

No you cannot; two unrelated executables which have distinct mm_ids can
easily mmap() the same shared file.
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