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

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Message-ID: <20170224121418.GQ6515@twins.programming.kicks-ass.net>
Date:   Fri, 24 Feb 2017 13:14:18 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Hari Bathini <hbathini@...ux.vnet.ibm.com>
Cc:     ast@...com, lkml <linux-kernel@...r.kernel.org>, acme@...nel.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

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>