linux-kernel - Re: [PATCH 1/3] perf: add PERF_RECORD_NAMESPACES to include namespaces related info

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Message-ID: <20161114104612.GA3102@twins.programming.kicks-ass.net>
Date:   Mon, 14 Nov 2016 11:46:12 +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
Subject: Re: [PATCH 1/3] perf: add PERF_RECORD_NAMESPACES to include
 namespaces related info

On Mon, Nov 14, 2016 at 04:02:30PM +0530, Hari Bathini wrote:

> >>  	PERF_RECORD_SWITCH_CPU_WIDE		= 15,
> >>+	/*
> >>+	 * struct {
> >>+	 *	struct perf_event_header	header;
> >>+	 *
> >>+	 *	u32				pid, tid;
> >>+	 *	u64				time;
> >>+	 *	u32				uts_ns_inum;
> >>+	 *	u32				ipc_ns_inum;
> >>+	 *	u32				mnt_ns_inum;
> >>+	 *	u32				pid_ns_inum;
> >>+	 *	u32				net_ns_inum;
> >>+	 *	u32				cgroup_ns_inum;
> >>+	 *	u32				user_ns_inum;
> >>+	 * 	struct sample_id		sample_id;
> >>+	 * };
> >>+	 */
> >>+	PERF_RECORD_NAMESPACES			= 16,
> >So this format is not extensible, that is, if someone adds yet another
> >namespace, we'll need to introduce PERF_RECORD_NAMESPACES2.
> >
> >Is there a 'natural' and exposed namespace index that we can use to
> >change it like:
> >
> >	u32	nr_nss;
> >	u32	namespace[nr_nss];
> >
> >?
> 
> Nothing of that sort exists, currently.
> Maybe, time to introduce with this patch-set..?

Would be good, but you'll have to sort that with the namespace folks.