linux-kernel - Re: [PATCH perf/core v5 02/15] perf-buildid-cache: Use path/to/bin/buildid/elf instead of path/to/bin/buildid

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Date:	Thu, 28 Apr 2016 10:52:50 +0900
From:	Masami Hiramatsu <mhiramat@...nel.org>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:	linux-kernel@...r.kernel.org, Namhyung Kim <namhyung@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Hemant Kumar <hemant@...ux.vnet.ibm.com>,
	Ananth N Mavinakayanahalli <ananth@...ux.vnet.ibm.com>
Subject: Re: [PATCH perf/core v5 02/15] perf-buildid-cache: Use
 path/to/bin/buildid/elf instead of path/to/bin/buildid

On Wed, 27 Apr 2016 18:12:32 -0300
Arnaldo Carvalho de Melo <acme@...nel.org> wrote:

> Em Thu, Apr 28, 2016 at 03:37:23AM +0900, Masami Hiramatsu escreveu:
> > From: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
> > 
> > Use path/to/bin/buildid/elf instead of path/to/bin/buildid
> > to store corresponding elf binary.
> > This also stores vdso in buildid/vdso, kallsyms in buildid/kallsyms.
> > 
> > Note that the existing caches are not updated until user adds
> > or updates the cache. Anyway, if there is the old style build-id
> > cache it falls back to use it. (IOW, it is backward compatible)
> 
> I reworded this to:
> 
> "If there is old style build-id cache content, i.e. links to
> path/to/bin/buildid/aa/bbccdd, it will still be accessible, IOW, this is
> backard compatible."
> 
> This part "existing caches are not updated until the user updates de
> cache" sounds confusing.

Ah, I see. Thank you!

> 
> Anyway, applied.
> 
> - Arnaldo


-- 
Masami Hiramatsu <mhiramat@...nel.org>