From: Thomas Schlichter <thomas.schlichter@web.de>
To: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Jan Beulich <JBeulich@novell.com>,
Arjan van de Ven <arjan@linux.intel.com>,
dri-devel@lists.sourceforge.net,
Robert Hancock <hancockrwd@gmail.com>,
Henrique de Moraes Holschuh <hmh@hmh.eng.br>,
"H. Peter Anvin" <hpa@zytor.com>,
jbarnes@virtuousgeek.org,
Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>,
linux-kernel@vger.kernel.org, Ingo Molnar <mingo@redhat.com>,
Suresh Siddha <suresh.b.siddha@intel.com>,
Thomas Gleixner <tglx@linutronix.de>,
Thomas Hellstrom <thellstrom@vmware.com>,
Tejun Heo <tj@kernel.org>,
Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>,
x86@kernel.org, Yinghai Lu <yinghai@kernel.org>
Subject: Re: [RFC Patch] use MTRR for write combining if PAT is not available
Date: Mon, 19 Oct 2009 17:07:40 +0200 [thread overview]
Message-ID: <1392918824@web.de> (raw)
Konrad Rzeszutek Wilk wrote:
> I am not familiar with libpciaccess, but I was wondering why that library
> cannot realize it failed in its endeavour and use other means to accomplish
> its goals?
The thing is that the mmap() will succeed! Only the memory region will not be
set up as write combining when PAT is disabled. So userspace would have to
find out it PAT is enabled in kernel and accordingly set up MTRR entries. And
currently I don't know of a kernel interface that would tell userspace if PAT is
enabled.
Kind regards,
Thomas
next reply other threads:[~2009-10-19 15:07 UTC|newest]
Thread overview: 60+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-10-19 15:07 Thomas Schlichter [this message]
-- strict thread matches above, loose matches on Subject: below --
2009-10-22 14:41 [RFC Patch] use MTRR for write combining if PAT is not available Thomas Schlichter
2009-10-22 14:27 Thomas Schlichter
2009-10-22 12:08 Thomas Schlichter
2009-10-22 12:14 ` H. Peter Anvin
2009-10-22 13:26 ` Suresh Siddha
2009-10-22 13:35 ` Suresh Siddha
2009-10-21 14:38 Thomas Schlichter
2009-10-21 15:14 ` Jan Beulich
2009-10-21 13:45 Thomas Schlichter
2009-10-21 14:11 ` Jan Beulich
2009-10-21 17:35 ` Ingo Molnar
2009-10-21 20:01 ` Thomas Schlichter
2009-10-22 9:53 ` Suresh Siddha
2009-10-22 15:34 ` Eric Anholt
2009-10-22 21:47 ` Suresh Siddha
2009-10-22 23:10 ` Jesse Barnes
2009-10-23 0:11 ` Suresh Siddha
2009-10-23 1:53 ` Eric Anholt
2009-10-23 4:31 ` Jesse Barnes
2009-10-23 4:58 ` Suresh Siddha
2009-10-23 7:24 ` Thomas Schlichter
2009-10-23 14:24 ` Suresh Siddha
2009-10-23 14:37 ` Ingo Molnar
2009-10-23 4:33 ` Suresh Siddha
2009-10-19 15:10 Thomas Schlichter
2009-10-19 15:28 ` Ingo Molnar
2009-10-19 14:59 Thomas Schlichter
2009-10-19 15:31 ` Ingo Molnar
2009-10-19 21:49 ` Suresh Siddha
2009-10-20 20:35 ` Thomas Schlichter
2009-10-20 21:59 ` Suresh Siddha
2009-10-21 11:52 ` Ingo Molnar
2009-10-19 14:47 Thomas Schlichter
2009-10-20 19:54 ` Thomas Schlichter
2009-10-21 11:57 ` Ingo Molnar
2009-10-13 7:34 Jan Beulich
2009-10-13 21:29 ` Thomas Schlichter
2009-10-14 8:13 ` Jan Beulich
2009-10-14 19:14 ` Thomas Schlichter
2009-10-15 7:48 ` Jan Beulich
2009-10-17 19:48 ` Thomas Schlichter
2009-10-19 9:16 ` Jan Beulich
2009-10-19 13:44 ` Suresh Siddha
2009-10-19 13:54 ` Ingo Molnar
2009-10-19 13:36 ` Konrad Rzeszutek Wilk
[not found] <200910122032.52168.thomas.schlichter@web.de>
2009-10-12 19:16 ` Thomas Hellstrom
2009-10-12 19:45 ` Thomas Schlichter
[not found] ` <1255378684.2063.5.camel@gaiman.anholt.net>
2009-10-13 21:05 ` Thomas Schlichter
2009-10-10 1:22 Thomas Schlichter
2009-10-10 4:24 ` Arjan van de Ven
2009-10-10 8:31 ` Thomas Schlichter
2009-10-10 15:45 ` Arjan van de Ven
2009-10-10 17:50 ` Roland Dreier
2009-10-11 7:40 ` Ingo Molnar
2009-10-11 9:56 ` Thomas Schlichter
2009-10-11 18:51 ` Henrique de Moraes Holschuh
2009-10-11 18:54 ` Arjan van de Ven
2009-10-11 20:19 ` Henrique de Moraes Holschuh
2009-10-12 18:09 ` Robert Hancock
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