From: Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com>
To: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@elte.hu>, Ryan Mallon <rmallon@gmail.com>,
Petr Tesarik <ptesarik@suse.cz>,
Andrew Morton <akpm@linux-foundation.org>,
Fenghua Yu <fenghua.yu@intel.com>, Ingo Molnar <mingo@redhat.com>,
Paul Mundt <lethal@linux-sh.org>,
Russell King <linux@arm.linux.org.uk>,
Thomas Gleixner <tglx@linutronix.de>,
Tony Luck <tony.luck@intel.com>,
x86@kernel.org, linux-arm-kernel@lists.infradead.org,
linux-ia64@vger.kernel.org, linux-sh@vger.kernel.org,
linux-kernel@vger.kernel.org,
Arjan van de Ven <arjan@infradead.org>,
Dave Jones <davej@redhat.com>,
Linus Torvalds <torvalds@linux-foundation.org>
Subject: Re: [PATCH 00/10] Enhance /dev/mem to allow read/write of arbitrary physical addresses
Date: Tue, 21 Jun 2011 12:25:42 +0530 [thread overview]
Message-ID: <20110621065542.GA13432@linux.vnet.ibm.com> (raw)
In-Reply-To: <4DFF6E58.8090306@zytor.com>
On Mon, Jun 20, 2011 at 08:59:20AM -0700, H. Peter Anvin wrote:
> We should either fix /dev/mem to work according to its specification or
> rip it out. The issue with test drivers is not spurious... I ran into
> this one myself a few weeks ago while trying to do a memory test (by
> limiting the amount of memory available to the kernel). This is
> something that is typically done on factory floors, and it would be nice
> to be able to get those environments over to using Linux.
We came across a similar request from our manufacturing folks. They have a
memory stress tool that needs to test how much bandwidth is possible between
various cpus and memory modules. Essentially they want the tool to run on some
chosen CPU and want it to drive traffic to some chosen memory module.
/dev/mem would be handy for such test programs ..
- vatsa
next prev parent reply other threads:[~2011-06-21 6:55 UTC|newest]
Thread overview: 51+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-06-17 8:38 [PATCH 00/10] Enhance /dev/mem to allow read/write of arbitrary physical addresses Petr Tesarik
2011-06-17 8:43 ` [PATCH 01/10] Return EOF on out-of-bounds read from /dev/mem Petr Tesarik
2011-06-17 8:44 ` [PATCH 02/10] (un)xlate_dev_mem_ptr: use phys_addr_t for the @phys parameter Petr Tesarik
2011-06-17 8:45 ` [PATCH 03/10] x86: translate highmem /dev/mem pointers Petr Tesarik
2011-06-17 8:45 ` [PATCH 04/10] ia64: change xlate_dev_mem_ptr's argument to phys_addr_t Petr Tesarik
2011-06-17 8:45 ` [PATCH 05/10] valid_phys_addr_range: use phys_addr_t for the @addr parameter Petr Tesarik
2011-06-17 8:46 ` [PATCH 06/10] sh: change valid_phys_addr_range's @addr param to phys_addr_t Petr Tesarik
2011-06-17 8:46 ` [PATCH 07/10] arm: " Petr Tesarik
2011-06-17 8:47 ` [PATCH 08/10] ia64: " Petr Tesarik
2011-06-17 8:48 ` [PATCH 09/10] x86: provide arch-specific valid_phys_addr_range() Petr Tesarik
2011-06-17 8:48 ` [PATCH 10/10] Allow reading/writing all memory through /dev/mem Petr Tesarik
2011-06-17 9:30 ` [PATCH 00/10] Enhance /dev/mem to allow read/write of arbitrary physical addresses Ingo Molnar
2011-06-17 9:41 ` Russell King - ARM Linux
2011-06-17 9:55 ` Petr Tesarik
2011-06-20 2:42 ` Américo Wang
2011-06-27 7:46 ` Petr Tesarik
2011-06-19 23:02 ` Ryan Mallon
2011-06-19 23:44 ` H. Peter Anvin
2011-06-20 7:41 ` Ingo Molnar
2011-06-20 15:59 ` H. Peter Anvin
2011-06-20 16:40 ` Ingo Molnar
2011-06-20 16:44 ` H. Peter Anvin
2011-06-21 6:55 ` Srivatsa Vaddagiri [this message]
2011-06-20 0:42 ` Matthew Wilcox
2011-06-20 0:46 ` Ryan Mallon
2011-06-20 0:52 ` Matthew Wilcox
2011-06-20 1:02 ` Ryan Mallon
2011-06-20 7:31 ` Ingo Molnar
2011-06-20 8:03 ` Ryan Mallon
2011-06-20 17:10 ` Ray Lee
2011-06-29 9:05 ` Petr Tesarik
2011-07-01 12:58 ` Ingo Molnar
2011-07-01 13:43 ` Petr Tesarik
2011-07-01 13:47 ` Christoph Hellwig
2011-07-01 14:37 ` Ingo Molnar
2011-07-01 14:41 ` Christoph Hellwig
2011-07-01 14:46 ` Ingo Molnar
2011-07-01 14:54 ` Petr Tesarik
2011-07-01 15:36 ` Ingo Molnar
2011-07-01 16:00 ` H. Peter Anvin
2011-07-01 16:13 ` Ingo Molnar
2011-07-01 19:34 ` Petr Tesarik
2011-07-01 19:56 ` Ingo Molnar
2011-07-01 20:44 ` Petr Tesarik
2011-07-03 19:46 ` Ingo Molnar
2011-07-05 17:49 ` Matthew Garrett
2011-07-05 17:56 ` H. Peter Anvin
2011-07-05 22:34 ` H. Peter Anvin
-- strict thread matches above, loose matches on Subject: below --
2011-06-20 13:24 Dave Anderson
2011-06-21 2:52 ` Cong Wang
2011-06-21 13:03 ` Dave Anderson
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