linux-kernel - Re: [RFC] autonuma: Support to scan page table asynchronously

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Message-ID: <20200417100633.GU20730@hirez.programming.kicks-ass.net>
Date:   Fri, 17 Apr 2020 12:06:33 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     "Huang, Ying" <ying.huang@...el.com>
Cc:     Mel Gorman <mgorman@...hsingularity.net>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
        Mel Gorman <mgorman@...e.de>, Rik van Riel <riel@...riel.com>,
        Daniel Jordan <daniel.m.jordan@...cle.com>,
        Tejun Heo <tj@...nel.org>, Dave Hansen <dave.hansen@...el.com>,
        Tim Chen <tim.c.chen@...el.com>,
        Aubrey Li <aubrey.li@...el.com>
Subject: Re: [RFC] autonuma: Support to scan page table asynchronously

On Thu, Apr 16, 2020 at 09:24:35AM +0800, Huang, Ying wrote:
> Peter Zijlstra <peterz@...radead.org> writes:
> 
> > On Tue, Apr 14, 2020 at 01:06:46PM +0100, Mel Gorman wrote:
> >> While it's just an opinion, my preference would be to focus on reducing
> >> the cost and amount of scanning done -- particularly for threads.
> >
> > This; I really don't believe in those back-charging things, esp. since
> > not having cgroups or having multiple applications in a single cgroup is
> > a valid setup.
> 
> Technically, it appears possible to back-charge the CPU time to the
> process/thread directly (not the cgroup).

I've yet to see a sane proposal there. What we're not going to do is
make regular task accounting more expensive than it already is.