linux-kernel - Re: [PATCH v7 1/8] perf: add PERF_RECORD_NAMESPACES to include namespaces related info

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Message-ID: <20170301204509.GH15145@kernel.org>
Date:   Wed, 1 Mar 2017 17:45:09 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Hari Bathini <hbathini@...ux.vnet.ibm.com>, ast@...com,
        lkml <linux-kernel@...r.kernel.org>,
        alexander.shishkin@...ux.intel.com, mingo@...hat.com,
        daniel@...earbox.net, rostedt@...dmis.org,
        Ananth N Mavinakayanahalli <ananth@...ux.vnet.ibm.com>,
        ebiederm@...ssion.com, sargun@...gun.me,
        Aravinda Prasad <aravinda@...ux.vnet.ibm.com>,
        brendan.d.gregg@...il.com, jolsa@...hat.com
Subject: Re: [PATCH v7 1/8] perf: add PERF_RECORD_NAMESPACES to include
 namespaces related info

Em Fri, Feb 24, 2017 at 01:14:18PM +0100, Peter Zijlstra escreveu:
> On Tue, Feb 21, 2017 at 07:31:23PM +0530, Hari Bathini wrote:
> > With the advert of container technologies like docker, that depend
> > on namespaces for isolation, there is a need for tracing support for
> > namespaces. This patch introduces new PERF_RECORD_NAMESPACES event
> > for recording namespaces related info. By recording info for every
> > namespace, it is left to userspace to take a call on the definition
> > of a container and trace containers by updating perf tool accordingly.
> > 
> > Each namespace has a combination of device and inode numbers. Though
> > every namespace has the same device number currently, that may change
> > in future to avoid the need for a namespace of namespaces. Considering
> > such possibility, record both device and inode numbers separately for
> > each namespace.
> > 
> > Signed-off-by: Hari Bathini <hbathini@...ux.vnet.ibm.com>
> > ---
> >  include/linux/perf_event.h      |    2 +
> >  include/uapi/linux/perf_event.h |   32 +++++++++
> >  kernel/events/core.c            |  139 +++++++++++++++++++++++++++++++++++++++
> >  kernel/fork.c                   |    2 +
> >  kernel/nsproxy.c                |    3 +
> >  5 files changed, 177 insertions(+), 1 deletion(-)
> 
> Arnaldo, seeing that most of this patch set is tool stuff, could you
> take the lot through the tool tree?
> 
> This patch:
> 
> Acked-by: Peter Zijlstra (Intel) <peterz@...radead.org>

Ok, looking at it now.

- Arnaldo