linux-kernel - Re: [PATCH v7 0/8] perf: add support for analyzing events for containers

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Message-Id: <57d820b3-ce55-bb9c-1c5f-e8b78d7705e5@linux.vnet.ibm.com>
Date:   Wed, 22 Feb 2017 18:10:28 +0530
From:   Hari Bathini <hbathini@...ux.vnet.ibm.com>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     ast@...com, peterz@...radead.org,
        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 v7 0/8] perf: add support for analyzing events for
 containers

Hi Jirka,


On Wednesday 22 February 2017 04:41 PM, Jiri Olsa wrote:
> On Tue, Feb 21, 2017 at 07:31:11PM +0530, Hari Bathini wrote:
>> Currently, there is no trivial mechanism to analyze events based on
>> containers. perf -G can be used, but it will not filter events for the
>> containers created after perf is invoked, making it difficult to assess/
>> analyze performance issues of multiple containers at once.
>>
>> This patch-set is aimed at addressing this limitation by introducing a
>> new PERF_RECORD_NAMESPACES event that records namespaces related info.
>> As containers are created with namespaces, the new data can be used to
>> in assessment/analysis of multiple containers.
>>
>> The first patch introduces PERF_RECORD_NAMESPACES in kernel while the
>> second patch makes the corresponding changes in perf tool to read this
>> PERF_RECORD_NAMESPACES events. The third patch demonstrates analysis
>> of containers with this data by adding a cgroup identifier column in
>> perf report, which contains the cgroup namespace's device and inode
>> numbers. This is based on the assumption that each container is created
>> with it's own cgroup namespace. The third patch has scope for improvement
>> based on the conventions a container is attributed with, going forward.
>>
>> Changes from v6:
>> * Updated changelog of patch 1
>> * Split patch 2 into smaller patches
>> * Updated record and script documenatation
>> * Dropped name field from ns_link_info struct
> what's this version based on? I can't cleanly apply it neither
> on tip's perf/core or master or Arnaldo's perf/core

That's odd. I based my patches against tip's perf/core
To be precise, the patches apply cleanly on top of commit
0c8967c9df230d2c4dde6649f410b62e01806c22.

Thanks
Hari