linux-kernel - Re: [PATCH -tip 19/32] entry/idle: Enter and exit kernel protection during idle entry and exit

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Message-ID: <20201125084908.GO2414@hirez.programming.kicks-ass.net>
Date:   Wed, 25 Nov 2020 09:49:08 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Joel Fernandes <joel@...lfernandes.org>
Cc:     Nishanth Aravamudan <naravamudan@...italocean.com>,
        Julien Desfossez <jdesfossez@...italocean.com>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        Vineeth Pillai <viremana@...ux.microsoft.com>,
        Aaron Lu <aaron.lwe@...il.com>,
        Aubrey Li <aubrey.intel@...il.com>, tglx@...utronix.de,
        linux-kernel@...r.kernel.org, mingo@...nel.org,
        torvalds@...ux-foundation.org, fweisbec@...il.com,
        keescook@...omium.org, kerrnel@...gle.com,
        Phil Auld <pauld@...hat.com>,
        Valentin Schneider <valentin.schneider@....com>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>,
        Paolo Bonzini <pbonzini@...hat.com>, vineeth@...byteword.org,
        Chen Yu <yu.c.chen@...el.com>,
        Christian Brauner <christian.brauner@...ntu.com>,
        Agata Gruza <agata.gruza@...el.com>,
        Antonio Gomez Iglesias <antonio.gomez.iglesias@...el.com>,
        graf@...zon.com, konrad.wilk@...cle.com, dfaggioli@...e.com,
        pjt@...gle.com, rostedt@...dmis.org, derkling@...gle.com,
        benbjiang@...cent.com,
        Alexandre Chartre <alexandre.chartre@...cle.com>,
        James.Bottomley@...senpartnership.com, OWeisse@...ch.edu,
        Dhaval Giani <dhaval.giani@...cle.com>,
        Junaid Shahid <junaids@...gle.com>, jsbarnes@...gle.com,
        chris.hyser@...cle.com, Ben Segall <bsegall@...gle.com>,
        Josh Don <joshdon@...gle.com>, Hao Luo <haoluo@...gle.com>,
        Tom Lendacky <thomas.lendacky@....com>,
        Aubrey Li <aubrey.li@...ux.intel.com>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Tim Chen <tim.c.chen@...el.com>
Subject: Re: [PATCH -tip 19/32] entry/idle: Enter and exit kernel protection
 during idle entry and exit

On Tue, Nov 24, 2020 at 01:03:43PM -0500, Joel Fernandes wrote:
> On Tue, Nov 24, 2020 at 05:13:35PM +0100, Peter Zijlstra wrote:
> > On Tue, Nov 17, 2020 at 06:19:49PM -0500, Joel Fernandes (Google) wrote:

> > > +static inline void generic_idle_enter(void)
> > > +static inline void generic_idle_exit(void)

> > That naming is terrible..
> 
> Yeah sorry :-\. The naming I chose was to be aligned with the
> CONFIG_GENERIC_ENTRY naming. I am open to ideas on that.

entry_idle_{enter,exit}() ?

> > I'm confused.. arch_cpu_idle_{enter,exit}() weren't conveniently placed
> > for you?
> 
> The way this patch series works, it does not depend on arch code as much as
> possible. Since there are other arch that may need this patchset such as ARM,
> it may be better to keep it in the generic entry code.  Thoughts?

I didn't necessarily mean using those hooks, even placing your new hooks
right next to them would've covered the exact same code with less lines
modified.