linux-kernel - Re: Should perf version match kernel version?

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Date:   Wed, 29 Jul 2020 18:02:20 +0200
From:   peterz@...radead.org
To:     Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        linux-kernel@...r.kernel.org, "Dmitry V. Levin" <ldv@...linux.org>
Subject: Re: Should perf version match kernel version?

On Wed, Jul 29, 2020 at 06:56:47PM +0300, Vitaly Chikunov wrote:
> Hi,
> 
> It seems that most distros try to have perf version to match with
> running kernel version. Is is requirement? Would it be better to have
> single perf from kernel mainline to work with any (older) kernel
> version?
> 
> We have different kernel versions in ALT Linux (stable for 4.19, 5.4,
> and 5.7) and I want to understand if we should have three perfs or
> single package will be enough.

We strive to have it all compatible, older perf should work on newer
kernel and newer perf should work on older kernel.

How well it's all tested is another.

Personally I often use a very old perf.