linux-kernel - Re: [PATCH] sched/tracing: append prev

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Message-ID: <20220422115557.0dc5cd86@gandalf.local.home>
Date:   Fri, 22 Apr 2022 11:55:57 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Delyan Kratunov <delyank@...com>,
        "valentin.schneider@....com" <valentin.schneider@....com>,
        "bigeasy@...utronix.de" <bigeasy@...utronix.de>,
        "dietmar.eggemann@....com" <dietmar.eggemann@....com>,
        "keescook@...omium.org" <keescook@...omium.org>,
        "andrii@...nel.org" <andrii@...nel.org>,
        "vincent.guittot@...aro.org" <vincent.guittot@...aro.org>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "mingo@...nel.org" <mingo@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "rdunlap@...radead.org" <rdunlap@...radead.org>,
        "Kenta.Tada@...y.com" <Kenta.Tada@...y.com>,
        "adharmap@...cinc.com" <adharmap@...cinc.com>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
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        "ast@...nel.org" <ast@...nel.org>,
        "legion@...nel.org" <legion@...nel.org>,
        "ed.tsai@...iatek.com" <ed.tsai@...iatek.com>,
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        "juri.lelli@...hat.com" <juri.lelli@...hat.com>,
        "x86@...nel.org" <x86@...nel.org>
Subject: Re: [PATCH] sched/tracing: append prev_state to tp args instead

On Fri, 22 Apr 2022 13:09:03 +0200
Peter Zijlstra <peterz@...radead.org> wrote:

> If bpf wants to ride on them, it needs to suffer the pain of doing so.

And I constantly hear that BPF is not an ABI, and is not guaranteed to work
from one kernel version to the next.

-- Steve