linux-kernel - Re: [RFC] perf-cache command interface design

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Message-ID: <20141110125021.GP3337@twins.programming.kicks-ass.net>
Date:	Mon, 10 Nov 2014 13:50:21 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Hagen Paul Pfeifer <hagen@...u.net>
Cc:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Hemant Kumar <hemant@...ux.vnet.ibm.com>,
	Namhyung Kim <namhyung@...nel.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	srikar@...ux.vnet.ibm.com, oleg@...hat.com,
	hegdevasant@...ux.vnet.ibm.com, mingo@...hat.com,
	systemtap@...rceware.org, aravinda@...ux.vnet.ibm.com,
	penberg@....fi, brendan.d.gregg@...il.com,
	"yrl.pp-manager.tt@...achi.com" <yrl.pp-manager.tt@...achi.com>
Subject: Re: [RFC] perf-cache command interface design

On Mon, Nov 10, 2014 at 01:05:45PM +0100, Hagen Paul Pfeifer wrote:
> On 7 November 2014 09:21, Masami Hiramatsu
> <masami.hiramatsu.pt@...achi.com> wrote:
> 
> > File Format
> > ===========
> > All the cache files are placed under ~/.debug/ by default.
> > The paths of buildid cache of binary/symbols are not changed.
> >
> > The SDT/probe caches are placed under the ~/.debug/.probes/path/to/bin/bu/ildid
> > and that is linked to ~/.debug/.probes/.buildid/bu/ildid
> > # To avoid conflict with files under /probes/*, I picked up .probes/.
> 
> A little bit late: but why ~/.debug? Why not $XDG_CACHE_HOME/perf/ as
> the root for all perf related files? debug is not unique nor is it sufficient
> to meet file hierarchy: man file-hierarchy(8)

# env | grep XDG | wc -l
0

Which renders it useless crap in my book.

I agree on the .debug name being somewhat generic, also, it would be:
man 8 file-hierarchy, but that too fails:

$ man file-hierarchy
No manual entry for file-hierarchy


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