linux-kernel - Re: [PATCH 1/2] perf: add container identifier entry in perf sample data

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Date:   Thu, 25 Aug 2016 15:01:39 +0200
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,
        sargun@...gun.me, Aravinda Prasad <aravinda@...ux.vnet.ibm.com>,
        "Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>,
        Ananth N Mavinakayanahalli <ananth@...ux.vnet.ibm.com>,
        daniel@...earbox.net
Subject: Re: [PATCH 1/2] perf: add container identifier entry in perf sample
 data

On Thu, Aug 25, 2016 at 05:27:54PM +0530, Hari Bathini wrote:

> diff --git a/include/uapi/linux/perf_event.h b/include/uapi/linux/perf_event.h
> index c66a485..fb4f902 100644
> --- a/include/uapi/linux/perf_event.h
> +++ b/include/uapi/linux/perf_event.h
> @@ -139,8 +139,9 @@ enum perf_event_sample_format {
>  	PERF_SAMPLE_IDENTIFIER			= 1U << 16,
>  	PERF_SAMPLE_TRANSACTION			= 1U << 17,
>  	PERF_SAMPLE_REGS_INTR			= 1U << 18,
> +	PERF_SAMPLE_CID				= 1U << 19,
>  
> -	PERF_SAMPLE_MAX = 1U << 19,		/* non-ABI */
> +	PERF_SAMPLE_MAX = 1U << 20,		/* non-ABI */
>  };

This forgets to update the comment that goes with PERF_RECORD_SAMPLE.
This patch would also need an update to the manpage:

  http://git.kernel.org/cgit/docs/man-pages/man-pages.git/tree/man2/perf_event_open.2

  http://www.man7.org/linux/man-pages/man2/perf_event_open.2.html

> +	if (sample_type & PERF_SAMPLE_CID) {
> +		int size = sizeof(u64);
> +
> +		/*
> +		 * Container identifier for a given task.
> +		 * Using cgroup namespace inode number for this.
> +		 */
> +		data->cid_entry.cid = current->nsproxy->cgroup_ns->ns.inum;
> +		data->cid_entry.reserved = 0;
> +		header->size += size;
> +	}
>  }

Does this compile with CONFIG_CGROUP=n ?