[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date: Mon, 9 Sep 2013 13:55:18 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: Jiri Olsa <jolsa@...hat.com>
Cc: linux-kernel@...r.kernel.org,
Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
Frederic Weisbecker <fweisbec@...il.com>,
Ingo Molnar <mingo@...e.hu>,
Namhyung Kim <namhyung@...nel.org>,
Paul Mackerras <paulus@...ba.org>,
Arnaldo Carvalho de Melo <acme@...hat.com>,
Andi Kleen <ak@...ux.intel.com>,
David Ahern <dsahern@...il.com>
Subject: Re: [PATCHv2 00/25] perf tool: Add support for multiple data file
storage
On Mon, Sep 09, 2013 at 01:36:41PM +0200, Jiri Olsa wrote:
> On Mon, Sep 09, 2013 at 01:17:49PM +0200, Peter Zijlstra wrote:
> > On Sun, Sep 01, 2013 at 12:36:11PM +0200, Jiri Olsa wrote:
> This patchset is actually doing 3 essential things:
> 1) adds new perf data format version (v3)
> 2) adds class/object to handle perf data file
> 3) adds record '-M size' option
So the -M thing is where the multiple files stuff comes from, right?
What's the purpose of this? Why would I care how big these files get,
surely filesystems handle 4g+ files these days.
> > The only reason I wanted this is so that each thread can write its own
> > data. The current one file thing is an immense bottle-neck for big
> > machines.
> >
>
> I haven't considered the thread based storage yet, but I
> think having the simplified format and centralized file
> handling will only help.
Please do consider it now, it'd suck to have to change the file format
thing yet again.
With both per-thread and size limited your filename generation needs
some extra bits I suppose.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists