linux-kernel - Re: [v3 3/3] mm, migrc: Add a sysctl knob to enable/disable MIGRC mechanism

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Message-ID: <20231030103652.GC81877@system.software.com>
Date:   Mon, 30 Oct 2023 19:36:52 +0900
From:   Byungchul Park <byungchul@...com>
To:     Nadav Amit <namit@...are.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-mm <linux-mm@...ck.org>,
        "kernel_team@...ynix.com" <kernel_team@...ynix.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "ying.huang@...el.com" <ying.huang@...el.com>,
        "xhao@...ux.alibaba.com" <xhao@...ux.alibaba.com>,
        "mgorman@...hsingularity.net" <mgorman@...hsingularity.net>,
        "hughd@...gle.com" <hughd@...gle.com>,
        "willy@...radead.org" <willy@...radead.org>,
        "david@...hat.com" <david@...hat.com>,
        "peterz@...radead.org" <peterz@...radead.org>,
        Andy Lutomirski <luto@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "bp@...en8.de" <bp@...en8.de>,
        "dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>
Subject: Re: [v3 3/3] mm, migrc: Add a sysctl knob to enable/disable MIGRC
 mechanism

On Mon, Oct 30, 2023 at 08:51:35AM +0000, Nadav Amit wrote:
> 
> > On Oct 30, 2023, at 9:25 AM, Byungchul Park <byungchul@...com> wrote:
> > 
> > Add a sysctl knob, '/proc/sys/vm/migrc_enable' to switch on/off migrc.
> 
> Please explain how users are expected to use this knob.
> 
> I suspect that the knob and the config option are not useful. You probably
> used them for your evaluation or as a “chicken-bit”, but they are not
> useful anymore.

Okay. We can add the sysctl knob when we need it. Will remove it for now.

However, I'm not sure if it'd be okay without CONFIG_MIGRC. I'd like to
see more opinion on it before going with it.

	Byungchul