linux-kernel - Re: [PATCH v3] mm, sysctl: make NUMA stats configurable

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Date:   Tue, 10 Oct 2017 16:57:28 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     Dave Hansen <dave.hansen@...ux.intel.com>
Cc:     kemi <kemi.wang@...el.com>,
        "Luis R . Rodriguez" <mcgrof@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Jonathan Corbet <corbet@....net>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Johannes Weiner <hannes@...xchg.org>,
        Christopher Lameter <cl@...ux.com>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Vlastimil Babka <vbabka@...e.cz>,
        Tim Chen <tim.c.chen@...el.com>,
        Andi Kleen <andi.kleen@...el.com>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        Ying Huang <ying.huang@...el.com>,
        Aaron Lu <aaron.lu@...el.com>,
        Proc sysctl <linux-fsdevel@...r.kernel.org>,
        Linux MM <linux-mm@...ck.org>,
        Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3] mm, sysctl: make NUMA stats configurable

On Tue 10-10-17 07:53:50, Dave Hansen wrote:
> On 10/10/2017 07:31 AM, Michal Hocko wrote:
> > On Tue 10-10-17 07:29:31, Dave Hansen wrote:
> >> On 10/09/2017 10:49 PM, Michal Hocko wrote:
> >>> Anyway I still stand by my position that this sounds over-engineered and
> >>> a simple 0/1 resp. on/off interface would be both simpler and safer. If
> >>> anybody wants an auto mode it can be added later (as a value 2 resp.
> >>> auto).
> >>
> >> 0/1 with the default set to the strict, slower mode?
> > 
> > yes, keep the current semantic and allow users who care to disable
> > something that stands in the way.
> 
> But, let's be honest, this leaves us with an option that nobody is ever
> going to turn on.  IOW, nobody except a very small portion of our users
> will ever see any benefit from this.

But aren't those small groups who would like to squeeze every single
cycle out from the page allocator path the targeted audience?
-- 
Michal Hocko
SUSE Labs