linux-kernel - Re: [RFC-PATCH 1/2] mm: Add __GFP_NO

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Message-ID: <20200814180224.GQ4295@paulmck-ThinkPad-P72>
Date:   Fri, 14 Aug 2020 11:02:24 -0700
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Michal Hocko <mhocko@...e.com>,
        Uladzislau Rezki <urezki@...il.com>,
        LKML <linux-kernel@...r.kernel.org>, RCU <rcu@...r.kernel.org>,
        linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        Matthew Wilcox <willy@...radead.org>,
        "Theodore Y . Ts'o" <tytso@....edu>,
        Joel Fernandes <joel@...lfernandes.org>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Oleksiy Avramchenko <oleksiy.avramchenko@...ymobile.com>
Subject: Re: [RFC-PATCH 1/2] mm: Add __GFP_NO_LOCKS flag

On Fri, Aug 14, 2020 at 07:49:24PM +0200, Peter Zijlstra wrote:
> On Fri, Aug 14, 2020 at 09:11:06AM -0700, Paul E. McKenney wrote:
> > Just to make sure we are talking about the same thing, please see below
> > for an untested patch that illustrates how I was interpreting your words.
> > Was this what you had in mind?
> 
> No, definitely not.
> 
> Also, since we used to be able to use call_rcu() _everywhere_, including
> under zone->lock, how's that working with you calling the
> page-allocating from it?

Indeed, that is exactly the problem we are trying to solve.

							Thanx, Paul