From: Russell King - ARM Linux <linux@arm.linux.org.uk>
To: "Woodruff, Richard" <r-woodruff2@ti.com>
Cc: Tony Lindgren <tony@atomide.com>,
"linux-arm-kernel@lists.arm.linux.org.uk"
<linux-arm-kernel@lists.arm.linux.org.uk>,
Kevin Hilman <khilman@deeprootsystems.com>,
Paul Walmsley <paul@pwsan.com>,
"linux-omap@vger.kernel.org" <linux-omap@vger.kernel.org>
Subject: Re: [PATCH 5/6] ARM: OMAP2: drop redundant pending write check for gptimer
Date: Sun, 7 Dec 2008 17:06:24 +0000 [thread overview]
Message-ID: <20081207170624.GA17640@flint.arm.linux.org.uk> (raw)
In-Reply-To: <13B9B4C6EF24D648824FF11BE8967162036D05AD4C@dlee02.ent.ti.com>
On Sun, Dec 07, 2008 at 08:55:54AM -0600, Woodruff, Richard wrote:
> Yes, NOHZ is _poor_ today in respect to needless reprogramming. Code can
> be improved. I have sent Thomas a patch for the same which is in the MM
> tree for a while now.
When I discussed this problem with Thomas, his reaction was rather
negative due to there being conflicting requirements between this and
ia64. And quite frankly I think that the OMAP behaviour is utter
madness - taking as long as it does to update the timer registers
means that no matter what you do, you _will_ be paying a penalty
for that hardware.
Let's hope that later OMAP designs sanitise the timer hardware so
it doesn't take stupid amounts of time to write to the registers,
posted mode or not.
next prev parent reply other threads:[~2008-12-07 17:06 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-12-05 2:38 [PATCH 0/6] Omap2 updates for 2.6.29 merge window Tony Lindgren
2008-12-05 2:39 ` [PATCH 1/6] ARM: OMAP2: Prepare cpu detection for further improvements Tony Lindgren
2008-12-05 2:39 ` [PATCH 2/6] ARM: OMAP2: Fix cpu detection Tony Lindgren
2008-12-05 2:40 ` [PATCH 3/6] ARM: OMAP2: Use omap_rev() instead of system_rev Tony Lindgren
2008-12-05 2:40 ` [PATCH 4/6] ARM: OMAP2: bard-h4: list those eeproms Tony Lindgren
2008-12-05 2:41 ` [PATCH 5/6] ARM: OMAP2: drop redundant pending write check for gptimer Tony Lindgren
2008-12-07 11:25 ` Russell King - ARM Linux
2008-12-07 14:55 ` Woodruff, Richard
2008-12-07 17:06 ` Russell King - ARM Linux [this message]
2008-12-07 20:54 ` Tony Lindgren
2008-12-11 22:14 ` Paul Walmsley
2008-12-05 2:41 ` [PATCH 6/6] ARM: OMAP2: skip unnecessary TLDR write during non-autoreload " Tony Lindgren
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=20081207170624.GA17640@flint.arm.linux.org.uk \
--to=linux@arm.linux.org.uk \
--cc=khilman@deeprootsystems.com \
--cc=linux-arm-kernel@lists.arm.linux.org.uk \
--cc=linux-omap@vger.kernel.org \
--cc=paul@pwsan.com \
--cc=r-woodruff2@ti.com \
--cc=tony@atomide.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