linux-kernel - Re: [PATCH] mm: add resched points to remap_pmd_range/ioremap_pmd

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Message-ID: <20150724165627.GA3458@Sligo.logfs.org>
Date:	Fri, 24 Jul 2015 09:56:27 -0700
From:	Jörn Engel <joern@...estorage.com>
To:	Michal Hocko <mhocko@...nel.org>
Cc:	Spencer Baugh <sbaugh@...ern.com>, Toshi Kani <toshi.kani@...com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Fengguang Wu <fengguang.wu@...el.com>,
	Joern Engel <joern@...fs.org>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Mel Gorman <mgorman@...e.de>,
	Johannes Weiner <hannes@...xchg.org>,
	Shachar Raindel <raindel@...lanox.com>,
	Boaz Harrosh <boaz@...xistor.com>,
	Andy Lutomirski <luto@...capital.net>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Andrey Ryabinin <a.ryabinin@...sung.com>,
	Roman Pen <r.peniaev@...il.com>,
	Andrey Konovalov <adech.fo@...il.com>,
	Eric Dumazet <edumazet@...gle.com>,
	Dmitry Vyukov <dvyukov@...gle.com>,
	Rob Jones <rob.jones@...ethink.co.uk>,
	WANG Chao <chaowang@...hat.com>,
	open list <linux-kernel@...r.kernel.org>,
	"open list:MEMORY MANAGEMENT" <linux-mm@...ck.org>,
	Spencer Baugh <Spencer.baugh@...estorage.com>
Subject: Re: [PATCH] mm: add resched points to
 remap_pmd_range/ioremap_pmd_range

On Fri, Jul 24, 2015 at 09:04:21AM +0200, Michal Hocko wrote:
> On Thu 23-07-15 14:54:33, Spencer Baugh wrote:
> > From: Joern Engel <joern@...fs.org>
> > 
> > Mapping large memory spaces can be slow and prevent high-priority
> > realtime threads from preempting lower-priority threads for a long time.
> 
> How can a lower priority task block the high priority one? Do you have
> preemption disabled?

Yes.

Jörn

--
If you're willing to restrict the flexibility of your approach,
you can almost always do something better.
-- John Carmack
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