linux-kernel - Re: [sched.h] 317419b91e: perf-sanity-tests.Parse_sched_tracepoints

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Date:   Thu, 14 Oct 2021 09:09:09 -0400 (EDT)
From:   Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
To:     Yafang Shao <laoar.shao@...il.com>
Cc:     acme <acme@...nel.org>, rostedt <rostedt@...dmis.org>,
        kernel test robot <oliver.sang@...el.com>,
        0day robot <lkp@...el.com>, Petr Mladek <pmladek@...e.com>,
        Kees Cook <keescook@...omium.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        lkp <lkp@...ts.01.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Valentin Schneider <valentin.schneider@....com>,
        Qiang Zhang <qiang.zhang@...driver.com>,
        robdclark <robdclark@...omium.org>,
        christian <christian@...uner.io>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Ingo Molnar <mingo@...hat.com>,
        Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
        bristot <bristot@...hat.com>,
        aubrey li <aubrey.li@...ux.intel.com>,
        yu c chen <yu.c.chen@...el.com>
Subject: Re: [sched.h] 317419b91e:
 perf-sanity-tests.Parse_sched_tracepoints_fields.fail

----- On Oct 14, 2021, at 9:05 AM, Yafang Shao laoar.shao@...il.com wrote:
[...]
>> If it happens that this ABI break is noticed by more than an in-tree test
>> program, then
>> the kernel's ABI rules will require that this trace field size stays unchanged.
>> This brings
>> up once more the whole topic of "Tracepoints ABI" which has been discussed
>> repeatedly in
>> the past.
>>
> 
> I will check if any other in-tree tools depends on TASK_COMM_LEN.

That's a start, but given this is a userspace ABI, out-of-tree userland
tools which depend of this to be fixed-size are also relevant.

Thanks,

Mathieu

-- 
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com