From: stepanm@codeaurora.org
To: Russell King - ARM Linux <linux@arm.linux.org.uk>
Cc: "Shilimkar, Santosh" <santosh.shilimkar@ti.com>,
"stepanm@codeaurora.org" <stepanm@codeaurora.org>,
"linux-arch@vger.kernel.org" <linux-arch@vger.kernel.org>,
"dwalker@codeaurora.org" <dwalker@codeaurora.org>,
"mel@csn.ul.ie" <mel@csn.ul.ie>,
"linux-arm-msm@vger.kernel.org" <linux-arm-msm@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
"andi@firstfloor.org" <andi@firstfloor.org>,
Zach Pfeffer <zpfeffer@codeaurora.org>,
Michael Bohan <mbohan@codeaurora.org>,
Tim HRM <zt.tmzt@gmail.com>,
"linux-omap@vger.kernel.org" <linux-omap@vger.kernel.org>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
"ebiederm@xmission.com" <ebiederm@xmission.com>
Subject: Re: [RFC 1/3 v3] mm: iommu: An API to unify IOMMU, CPU and device memory management
Date: Wed, 21 Jul 2010 11:04:52 -0700 (PDT) [thread overview]
Message-ID: <f63baf765051c19b85938ea73d6c6b2a.squirrel@www.codeaurora.org> (raw)
In-Reply-To: <20100721072837.GB6009@n2100.arm.linux.org.uk>
> *************************************************************************
>> > This is difficult to achieve without remapping kernel memory using L2
>> > page tables, so we can unmap pages on 4K page granularity. That's
>> > going to increase TLB overhead and result in lower system performance
>> > as there'll be a greater number of MMU misses.
> *************************************************************************
Given how the buffers in question can be on the orders of tens of MB (and
I don't think they will ever be less than 1MB), would we be able to get
the desired effect by unmapping and then remapping on a 1MB granularity
(ie, L1 sections)? It seems to me like this should be sufficient, and
would not require using L2 mappings. Thoughts?
Thanks
Steve
Sent by an employee of the Qualcomm Innovation Center, Inc.
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next prev parent reply other threads:[~2010-07-21 18:03 UTC|newest]
Thread overview: 53+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-07-03 5:38 [RFC 1/3 v3] mm: iommu: An API to unify IOMMU, CPU and device memory management Zach Pfeffer
2010-07-03 19:06 ` Eric W. Biederman
2010-07-07 22:44 ` Zach Pfeffer
2010-07-07 23:07 ` Russell King - ARM Linux
2010-07-08 23:59 ` Zach Pfeffer
2010-07-12 1:25 ` FUJITA Tomonori
2010-07-13 5:57 ` Zach Pfeffer
2010-07-13 6:03 ` FUJITA Tomonori
2010-07-13 12:14 ` Zach Pfeffer
2010-07-14 1:59 ` FUJITA Tomonori
2010-07-14 20:11 ` Zach Pfeffer
2010-07-14 22:05 ` Russell King - ARM Linux
2010-07-15 1:29 ` Zach Pfeffer
2010-07-15 1:47 ` Eric W. Biederman
2010-07-15 5:40 ` Zach Pfeffer
2010-07-15 5:35 ` Zach Pfeffer
2010-07-15 8:55 ` Russell King - ARM Linux
2010-07-16 0:48 ` Tim HRM
2010-07-16 7:58 ` Russell King - ARM Linux
2010-07-17 0:01 ` Larry Bassel
2010-07-19 9:21 ` Tim HRM
2010-07-21 0:44 ` Zach Pfeffer
2010-07-21 1:44 ` Timothy Meade
2010-07-22 4:06 ` Zach Pfeffer
2010-07-19 17:55 ` Michael Bohan
2010-07-19 18:40 ` Russell King - ARM Linux
2010-07-20 22:02 ` stepanm
2010-07-20 22:29 ` Russell King - ARM Linux
2010-07-21 5:49 ` Shilimkar, Santosh
2010-07-21 7:28 ` Russell King - ARM Linux
2010-07-21 7:45 ` Shilimkar, Santosh
2010-07-21 18:04 ` stepanm [this message]
2010-07-20 20:45 ` Zach Pfeffer
2010-07-20 20:54 ` Russell King - ARM Linux
2010-07-20 21:56 ` Zach Pfeffer
2010-07-19 6:52 ` Zach Pfeffer
2010-07-19 7:44 ` Eric W. Biederman
2010-07-22 4:25 ` Zach Pfeffer
2010-07-22 7:34 ` Russell King - ARM Linux
2010-07-22 16:25 ` Zach Pfeffer
2010-07-14 23:07 ` FUJITA Tomonori
2010-07-15 1:41 ` Zach Pfeffer
2010-07-19 8:22 ` Russell King - ARM Linux
2010-07-20 10:09 ` FUJITA Tomonori
2010-07-20 22:20 ` Zach Pfeffer
2010-07-21 1:44 ` FUJITA Tomonori
2010-07-22 4:30 ` Zach Pfeffer
2010-07-22 4:43 ` FUJITA Tomonori
2010-07-22 16:44 ` Zach Pfeffer
2010-07-22 7:39 ` Russell King - ARM Linux
2010-07-22 16:28 ` Zach Pfeffer
-- strict thread matches above, loose matches on Subject: below --
2010-07-06 15:42 Zach Pfeffer
2010-07-21 5:18 stepanm
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