linux-kernel - Re: [PATCH v5 16/18] perf: enable reading of perf.data files from different ABI rev

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Date:	Tue, 07 Feb 2012 12:33:02 +0530
From:	Anshuman Khandual <khandual@...ux.vnet.ibm.com>
To:	Arnaldo Carvalho de Melo <acme@...hat.com>
CC:	Stephane Eranian <eranian@...gle.com>,
	linux-kernel@...r.kernel.org, peterz@...radead.org, mingo@...e.hu,
	robert.richter@....com, ming.m.lin@...el.com, andi@...stfloor.org,
	asharma@...com, ravitillo@....gov, vweaver1@...s.utk.edu,
	dsahern@...il.com
Subject: Re: [PATCH v5 16/18] perf: enable reading of perf.data files from
 different ABI rev

On Monday 06 February 2012 11:52 PM, Arnaldo Carvalho de Melo wrote:
> Em Thu, Feb 02, 2012 at 01:54:46PM +0100, Stephane Eranian escreveu:
>> This patch allows perf to process perf.data files generated
>> using an ABI that has a different perf_event_attr struct size, i.e.,
>> a different ABI version.
>>
>> The perf_event_attr can be extended, yet perf needs to cope with
>> older perf.data files. Similarly, perf must be able to cope with
>> a perf.data file which is using a newer version of the ABI than
>> what it knows about.
>>
>> This patch adds read_attr(), a routine that reads a perf_event_attr
>> struct from a file incrementally based on its advertised size. If
>> the on-file struct is smaller than what perf knows, then the extra
>> fields are zeroed. If the on-file struct is bigger, then perf only
>> uses what it knows about, the rest is skipped.
> 
> Anshuman, can I have your Acked-by or Reviewed-by since you spotted
> problems in this and your suggestions were taken into account? Is this
> OK now?
> 

(1) PERF_SAMPLE_BRANCH_HV and related privilege level problems has been fixed. 
    Verified various combinations of <branch_type>,[u,k,hv] <event>:[u,k,h].
    Works well in all privilege level permutations.

(2) As Peter has mentioned 'has_branch_smpl()' bug in the ARM code would be taken
    care.

(3) 'ref_size' problem in try_all_pipe_abis() has been fixed. All the patches 
    independently compile successfully.

(4) Went through the entire patchset, looks good to me. 

Acked-by: Anshuman Khandual <khandual@...ux.vnet.ibm.com>
Tested-by: Anshuman Khandual <khandual@...ux.vnet.ibm.com>
-- 
Anshuman Khandual
Linux Technology Centre
IBM Systems and Technology Group

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