linux-kernel - Re: Performance Regression in Linux Kernel 5.19

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Message-ID: <YyBnkES/eDbiE2xA@hirez.programming.kicks-ass.net>
Date:   Tue, 13 Sep 2022 13:20:48 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Manikandan Jagatheesan <mjagatheesan@...are.com>
Cc:     Borislav Petkov <bp@...en8.de>,
        "jpoimboe@...nel.org" <jpoimboe@...nel.org>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>,
        "x86@...nel.org" <x86@...nel.org>, "hpa@...or.com" <hpa@...or.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "srivatsa@...il.mit.edu" <srivatsa@...il.mit.edu>,
        Peter Jonasson <pjonasson@...are.com>,
        Yiu Cho Lau <lauyiuch@...are.com>,
        Rajender M <manir@...are.com>,
        Abdul Anshad Azeez <aazees@...are.com>,
        Kodeswaran Kumarasamy <kkumarasamy@...are.com>,
        Rahul Gopakumar <gopakumarr@...are.com>
Subject: Re: Performance Regression in Linux Kernel 5.19

On Tue, Sep 13, 2022 at 08:40:49AM +0000, Manikandan Jagatheesan wrote:

> Are there are any ongoing activities to optimize the performance?

https://lkml.kernel.org/r/20220902130625.217071627@infradead.org

I should post a new version soonish:

  git://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git call-depth-tracking

boot with:

  spectre_v2=retpoline retbleed=stuff