From: Andrew Morton <akpm@linux-foundation.org>
To: Michal Hocko <mhocko@kernel.org>
Cc: Dave Hansen <dave.hansen@linux.intel.com>,
kemi <kemi.wang@intel.com>,
"Luis R . Rodriguez" <mcgrof@kernel.org>,
Kees Cook <keescook@chromium.org>,
Jonathan Corbet <corbet@lwn.net>,
Mel Gorman <mgorman@techsingularity.net>,
Johannes Weiner <hannes@cmpxchg.org>,
Christopher Lameter <cl@linux.com>,
Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
Vlastimil Babka <vbabka@suse.cz>, Tim Chen <tim.c.chen@intel.com>,
Andi Kleen <andi.kleen@intel.com>,
Jesper Dangaard Brouer <brouer@redhat.com>,
Ying Huang <ying.huang@intel.com>, Aaron Lu <aaron.lu@intel.com>,
Proc sysctl <linux-fsdevel@vger.kernel.org>,
Linux MM <linux-mm@kvack.org>,
Linux Kernel <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v3] mm, sysctl: make NUMA stats configurable
Date: Tue, 10 Oct 2017 14:34:05 -0700 [thread overview]
Message-ID: <20171010143405.fd03274b12bbda0eba00362e@linux-foundation.org> (raw)
In-Reply-To: <20171010175143.q4bz43dtn4eyn32j@dhcp22.suse.cz>
On Tue, 10 Oct 2017 19:51:43 +0200 Michal Hocko <mhocko@kernel.org> wrote:
> On Tue 10-10-17 08:39:47, Dave Hansen wrote:
> > On 10/10/2017 07:57 AM, Michal Hocko wrote:
> > >> 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?
> >
> > They're the reason we started looking at this. They also care the most.
> >
> > But, the cost of these stats, especially we get more and more cores in a
> > NUMA node is really making them show up in profiles. It would be nice
> > to get rid of them there, too.
>
> I am not opposing to the auto mode. I am just not sure it is a safe
> default and I also think that we should add this on top if it is really
> needed.
Yup. Let's keep things simple unless a real need is demonstrated, please.
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next prev parent reply other threads:[~2017-10-10 21:34 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-09-28 6:11 [PATCH v3] mm, sysctl: make NUMA stats configurable Kemi Wang
2017-09-28 21:29 ` Andrew Morton
2017-09-29 1:44 ` kemi
2017-09-29 7:09 ` Vlastimil Babka
2017-09-29 7:03 ` Vlastimil Babka
2017-10-09 2:20 ` kemi
2017-09-29 7:27 ` Vlastimil Babka
2017-10-03 9:23 ` Michal Hocko
2017-10-09 6:34 ` kemi
2017-10-09 7:55 ` Michal Hocko
2017-10-10 5:49 ` Michal Hocko
2017-10-10 5:54 ` kemi
2017-10-10 14:29 ` Dave Hansen
2017-10-10 14:31 ` Michal Hocko
2017-10-10 14:53 ` Dave Hansen
2017-10-10 14:57 ` Michal Hocko
2017-10-10 15:14 ` Christopher Lameter
2017-10-10 15:39 ` Dave Hansen
2017-10-10 17:51 ` Michal Hocko
2017-10-10 21:34 ` Andrew Morton [this message]
2017-10-11 6:16 ` Vlastimil Babka
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