From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Dan Malek <dan@embeddedalley.com>
Cc: linuxppc-dev list <linuxppc-dev@ozlabs.org>,
Timur Tabi <timur@freescale.com>
Subject: Re: Discussion about iopa()
Date: Sat, 10 Feb 2007 13:37:01 +1100 [thread overview]
Message-ID: <1171075021.20494.0.camel@localhost.localdomain> (raw)
In-Reply-To: <712E63F6-23D6-45EB-92F0-95656FF38BC4@embeddedalley.com>
On Fri, 2007-02-09 at 12:08 -0500, Dan Malek wrote:
> On Feb 8, 2007, at 8:41 AM, Timur Tabi wrote:
>
> > Walking the page table is slower than using pointer math, so you
> > want to
> > avoid iopa() if you can.
>
> Big deal. With all of the other kernel bloat
> going on you want to argue about a couple
> of memory accesses? :-)
We are fairly careful about not bloating fast path in general. It's more
than a couple of memory accesses, especially with PTEs in highmem where
it involves kmap.
Ben.
next prev parent reply other threads:[~2007-02-10 2:37 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-02-06 11:31 [PATCH 1/4] ucc_geth: Change private immrbar_virt_to_phys to generic iopa Li Yang
2007-02-06 14:26 ` Kumar Gala
2007-02-07 9:34 ` Li Yang-r58472
2007-02-07 16:36 ` Kumar Gala
2007-02-07 16:43 ` Timur Tabi
2007-02-07 16:49 ` Kumar Gala
2007-02-07 17:03 ` Timur Tabi
2007-02-08 5:52 ` Li Yang-r58472
2007-02-08 5:57 ` Kumar Gala
2007-02-08 6:48 ` Li Yang-r58472
2007-02-08 6:53 ` Kumar Gala
2007-02-08 7:06 ` Li Yang-r58472
2007-02-08 7:16 ` Kumar Gala
2007-02-08 7:36 ` Li Yang-r58472
2007-02-08 7:41 ` Kumar Gala
2007-02-08 9:22 ` Discussion about iopa() Li Yang-r58472
2007-02-08 13:41 ` Timur Tabi
2007-02-09 17:08 ` Dan Malek
2007-02-10 2:37 ` Benjamin Herrenschmidt [this message]
2007-02-10 18:04 ` Dan Malek
2007-02-10 21:40 ` Benjamin Herrenschmidt
2007-02-10 22:27 ` Dan Malek
2007-02-10 22:42 ` Benjamin Herrenschmidt
2007-02-08 21:26 ` Benjamin Herrenschmidt
2007-02-09 17:13 ` Dan Malek
2007-02-09 22:06 ` Benjamin Herrenschmidt
2007-02-09 22:46 ` Kumar Gala
2007-02-09 22:51 ` Timur Tabi
2007-02-09 23:06 ` Kumar Gala
2007-02-09 23:10 ` Timur Tabi
2007-02-09 23:19 ` Benjamin Herrenschmidt
2007-02-09 23:22 ` Kumar Gala
2007-02-09 23:33 ` Timur Tabi
2007-02-09 23:43 ` Kumar Gala
2007-02-09 17:06 ` Dan Malek
2007-02-08 13:35 ` [PATCH 1/4] ucc_geth: Change private immrbar_virt_to_phys to generic iopa Timur Tabi
2007-02-09 17:22 ` Dan Malek
2007-02-09 17:26 ` Timur Tabi
2007-02-08 13:27 ` Timur Tabi
2007-02-07 0:19 ` Jeff Garzik
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1171075021.20494.0.camel@localhost.localdomain \
--to=benh@kernel.crashing.org \
--cc=dan@embeddedalley.com \
--cc=linuxppc-dev@ozlabs.org \
--cc=timur@freescale.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).