From: Arjan van de Ven <arjan@infradead.org>
To: Jes Sorensen <jes@sgi.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>,
"Luck, Tony" <tony.luck@intel.com>,
John Daiker <jdaiker@osdl.org>, John Hawkes <hawkes@sgi.com>,
Tony Luck <tony.luck@gmail.com>, Andrew Morton <akpm@osdl.org>,
linux-ia64@vger.kernel.org, linux-kernel@vger.kernel.org,
Jack Steiner <steiner@sgi.com>, Dan Higgins <djh@sgi.com>,
Jeremy Higdon <jeremy@sgi.com>
Subject: Re: [PATCH] ia64: change usermode HZ to 250
Date: Thu, 29 Jun 2006 10:55:13 +0000 [thread overview]
Message-ID: <1151578513.3122.22.camel@laptopd505.fenrus.org> (raw)
In-Reply-To: <44A3AFFB.2000203@sgi.com>
On Thu, 2006-06-29 at 12:48 +0200, Jes Sorensen wrote:
> Alan Cox wrote:
> > Ar Iau, 2006-06-29 am 05:37 -0400, ysgrifennodd Jes Sorensen:
> >> You have my vote for that one. Anything else is just going to cause
> >> those broken userapps to continue doing the wrong thing. We should
> >> really do this on all archs though.
> >
> > No need, all current mainstream architectures expose a constant user HZ.
>
Hi,
> But you are still going to have the issue where someone installs their
> own kernel and apps will break because of this?
to answer that question with one word: no.
read what Alan said: the HZ exposed to userspace is *constant*. For
example, the i386 user visible HZ is 100, even if the kernel runs at a
HZ of 250 or 1000.... Just when a HZ value gets exposed to userspace,
it's transformed into a HZ\x100 based value.
And that's not a distribution thing, that's the kernel.org kernel
honoring the stable-userspace-interface contract, and common sense..
Greetings,
Arjan van de Ven
next prev parent reply other threads:[~2006-06-29 10:55 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-06-27 22:01 [PATCH] ia64: change usermode HZ to 250 hawkes
2006-06-27 22:26 ` Luck, Tony
2006-06-27 23:09 ` Lee Revell
2006-06-28 8:43 ` Arjan van de Ven
2006-06-28 10:47 ` Alan Cox
2006-06-28 10:34 ` Arjan van de Ven
2006-06-28 14:46 ` Christoph Lameter
2006-06-28 8:39 ` Arjan van de Ven
2006-06-28 15:43 ` John Hawkes
2006-06-28 16:21 ` Alan Cox
2006-06-28 16:11 ` John Daiker
2006-06-28 16:50 ` Alan Cox
2006-06-28 17:36 ` Luck, Tony
2006-06-29 9:37 ` Jes Sorensen
2006-06-29 10:46 ` Alan Cox
2006-06-29 10:48 ` Jes Sorensen
2006-06-29 10:55 ` Arjan van de Ven [this message]
2006-06-29 12:56 ` Jes Sorensen
2006-07-08 0:14 ` Jeremy Higdon
2006-07-08 2:51 ` Tony Luck
2006-07-08 6:42 ` Arjan van de Ven
2006-07-08 13:07 ` David Mosberger-Tang
2006-07-10 20:22 ` Jeremy Higdon
2006-07-11 3:01 ` David Mosberger-Tang
2006-07-11 9:53 ` Alan Cox
2006-07-11 18:37 ` Jeremy Higdon
2006-07-12 2:02 ` David Mosberger-Tang
2006-06-29 11:34 ` Alan Cox
2006-06-29 14:09 ` Albert Cahalan
2006-07-09 19:18 ` Luck, Tony
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