Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
	id S1753702AbbGXHE2 (ORCPT <rfc822;w@1wt.eu>);
	Fri, 24 Jul 2015 03:04:28 -0400
Received: from mail-wi0-f175.google.com ([209.85.212.175]:34566 "EHLO
	mail-wi0-f175.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
	with ESMTP id S1752249AbbGXHEY (ORCPT
	<rfc822;linux-kernel@vger.kernel.org>);
	Fri, 24 Jul 2015 03:04:24 -0400
Date: Fri, 24 Jul 2015 09:04:21 +0200
From: Michal Hocko <mhocko@kernel.org>
To: Spencer Baugh <sbaugh@catern.com>
Cc: Toshi Kani <toshi.kani@hp.com>, Andrew Morton <akpm@linux-foundation.org>,
        Fengguang Wu <fengguang.wu@intel.com>, Joern Engel <joern@logfs.org>,
        "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
        Mel Gorman <mgorman@suse.de>, Johannes Weiner <hannes@cmpxchg.org>,
        Shachar Raindel <raindel@mellanox.com>,
        Boaz Harrosh <boaz@plexistor.com>,
        Andy Lutomirski <luto@amacapital.net>,
        Joonsoo Kim <iamjoonsoo.kim@lge.com>,
        Andrey Ryabinin <a.ryabinin@samsung.com>,
        Roman Pen <r.peniaev@gmail.com>, Andrey Konovalov <adech.fo@gmail.com>,
        Eric Dumazet <edumazet@google.com>, Dmitry Vyukov <dvyukov@google.com>,
        Rob Jones <rob.jones@codethink.co.uk>, WANG Chao <chaowang@redhat.com>,
        open list <linux-kernel@vger.kernel.org>,
        "open list:MEMORY MANAGEMENT" <linux-mm@kvack.org>,
        Joern Engel <joern@purestorage.com>,
        Spencer Baugh <Spencer.baugh@purestorage.com>
Subject: Re: [PATCH] mm: add resched points to
 remap_pmd_range/ioremap_pmd_range
Message-ID: <20150724070420.GF4103@dhcp22.suse.cz>
References: <1437688476-3399-3-git-send-email-sbaugh@catern.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <1437688476-3399-3-git-send-email-sbaugh@catern.com>
User-Agent: Mutt/1.5.23 (2014-03-12)
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org
Content-Length: 603
Lines: 18

On Thu 23-07-15 14:54:33, Spencer Baugh wrote:
> From: Joern Engel <joern@logfs.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?

[...]
-- 
Michal Hocko
SUSE Labs
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/