From: "John Hawkes" <hawkes@sgi.com>
To: Arjan van de Ven <arjan@infradead.org>
Cc: 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: Wed, 28 Jun 2006 15:43:46 +0000 [thread overview]
Message-ID: <005e01c69ac9$a55e1bf0$6f00a8c0@comcast.net> (raw)
In-Reply-To: 1151483994.3153.5.camel@laptopd505.fenrus.org
From: "Arjan van de Ven" <arjan@infradead.org>
...
> ok why not define the userspace HZ to
>
> #define HZ sysconf(_SC_CLK_TCK)
That did occur to me. It obviously does get the correct value. The downside
is that one of those crufty apps that thinks it is using "HZ" as a constant
will instead be invoking a more costly syscall. Should we care about the
resulting performance impact?
I vote for Arjan's solution.
John Hawkes
WARNING: multiple messages have this Message-ID (diff)
From: "John Hawkes" <hawkes@sgi.com>
To: "Arjan van de Ven" <arjan@infradead.org>
Cc: "Tony Luck" <tony.luck@gmail.com>,
"Andrew Morton" <akpm@osdl.org>, <linux-ia64@vger.kernel.org>,
<linux-kernel@vger.kernel.org>, "Jack Steiner" <steiner@sgi.com>,
"Dan Higgins" <djh@sgi.com>, "Jeremy Higdon" <jeremy@sgi.com>
Subject: Re: [PATCH] ia64: change usermode HZ to 250
Date: Wed, 28 Jun 2006 08:43:46 -0700 [thread overview]
Message-ID: <005e01c69ac9$a55e1bf0$6f00a8c0@comcast.net> (raw)
In-Reply-To: 1151483994.3153.5.camel@laptopd505.fenrus.org
From: "Arjan van de Ven" <arjan@infradead.org>
...
> ok why not define the userspace HZ to
>
> #define HZ sysconf(_SC_CLK_TCK)
That did occur to me. It obviously does get the correct value. The downside
is that one of those crufty apps that thinks it is using "HZ" as a constant
will instead be invoking a more costly syscall. Should we care about the
resulting performance impact?
I vote for Arjan's solution.
John Hawkes
next prev parent reply other threads:[~2006-06-28 15:43 UTC|newest]
Thread overview: 60+ 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 22:01 ` hawkes
2006-06-27 22:26 ` Luck, Tony
2006-06-27 22:26 ` Luck, Tony
2006-06-27 23:09 ` Lee Revell
2006-06-27 23:09 ` Lee Revell
2006-06-28 8:43 ` Arjan van de Ven
2006-06-28 8:43 ` Arjan van de Ven
2006-06-28 10:47 ` Alan Cox
2006-06-28 10:47 ` Alan Cox
2006-06-28 10:34 ` Arjan van de Ven
2006-06-28 10:34 ` Arjan van de Ven
2006-06-28 14:46 ` Christoph Lameter
2006-06-28 14:46 ` Christoph Lameter
2006-06-28 8:39 ` Arjan van de Ven
2006-06-28 8:39 ` Arjan van de Ven
2006-06-28 15:43 ` John Hawkes [this message]
2006-06-28 15:43 ` John Hawkes
2006-06-28 16:21 ` Alan Cox
2006-06-28 16:21 ` Alan Cox
2006-06-28 16:11 ` John Daiker
2006-06-28 16:11 ` John Daiker
2006-06-28 16:50 ` Alan Cox
2006-06-28 16:50 ` Alan Cox
2006-06-28 17:36 ` Luck, Tony
2006-06-28 17:36 ` Luck, Tony
2006-06-29 9:37 ` Jes Sorensen
2006-06-29 9:37 ` Jes Sorensen
2006-06-29 10:46 ` Alan Cox
2006-06-29 11:02 ` Alan Cox
2006-06-29 10:48 ` Jes Sorensen
2006-06-29 10:48 ` Jes Sorensen
2006-06-29 10:55 ` Arjan van de Ven
2006-06-29 10:55 ` Arjan van de Ven
2006-06-29 12:56 ` Jes Sorensen
2006-06-29 12:56 ` Jes Sorensen
2006-07-08 0:14 ` Jeremy Higdon
2006-07-08 0:14 ` Jeremy Higdon
2006-07-08 2:51 ` Tony Luck
2006-07-08 2:51 ` Tony Luck
2006-07-08 6:42 ` Arjan van de Ven
2006-07-08 6:42 ` Arjan van de Ven
2006-07-08 13:07 ` David Mosberger-Tang
2006-07-08 13:07 ` David Mosberger-Tang
2006-07-10 20:22 ` Jeremy Higdon
2006-07-10 20:22 ` Jeremy Higdon
2006-07-11 3:01 ` David Mosberger-Tang
2006-07-11 3:01 ` David Mosberger-Tang
2006-07-11 9:53 ` Alan Cox
2006-07-11 10:10 ` Alan Cox
2006-07-11 18:37 ` Jeremy Higdon
2006-07-11 18:37 ` Jeremy Higdon
2006-07-12 2:02 ` David Mosberger-Tang
2006-07-12 2:02 ` David Mosberger-Tang
2006-06-29 11:34 ` Alan Cox
2006-06-29 11:34 ` Alan Cox
2006-06-29 14:09 ` Albert Cahalan
2006-06-29 14:09 ` Albert Cahalan
2006-07-09 19:18 ` Luck, Tony
2006-07-09 19:18 ` Luck, Tony
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