linux-kernel - Re: [PATCH 1/2] perf tools: Fix seg fault with Intel PT

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Message-ID: <20160126143014.GD4361@kernel.org>
Date:	Tue, 26 Jan 2016 11:30:14 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Adrian Hunter <adrian.hunter@...el.com>
Cc:	Jiri Olsa <jolsa@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] perf tools: Fix seg fault with Intel PT

Em Tue, Jan 26, 2016 at 04:00:56PM +0200, Adrian Hunter escreveu:
> On 26/01/16 15:54, Arnaldo Carvalho de Melo wrote:
> > [acme@...andy linux]$ 

> > So, this needs:

> > 1) A machine that supports Intel PT
> > 2) A kernel that supports Intel PT
> > 3) A kernel that doesn't have perf_event_attr.context_switch, so that it tries
> >    to use sched:sched_switch
> > 4) an unreadable tracefs

> > What was the kernel where you stumbled on this problem? What machine?
 
> Kernel was v4.2, machine was Broadwell.
 
> context_switch was added in v4.3 I think, and PT was v4.1
> so I guess v4.1 and v4.2 are affected.

Thanks for the info, my new main machine is a t450s, so Broadwell, will
boot with 4.1/4.2.

- Arnaldo