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From: Linus Torvalds <torvalds@transmeta.com>
To: "Albert D. Cahalan" <acahalan@cs.uml.edu>
Cc: Russell King <rmk@arm.linux.org.uk>, <linux-kernel@vger.kernel.org>
Subject: Re: HZ, preferably as small as possible
Date: Mon, 15 Jul 2002 11:50:58 -0700 (PDT)	[thread overview]
Message-ID: <Pine.LNX.4.33.0207151148080.19586-100000@penguin.transmeta.com> (raw)
In-Reply-To: <200207151607.g6FG7In203512@saturn.cs.uml.edu>


On Mon, 15 Jul 2002, Albert D. Cahalan wrote:
>
> It's not a different value in libproc. There's autodetection.
> I can't just support "the majority of ARM", and people keep
> giving me shit about HZ supposedly being a per-arch constant.
> (not that there's a sane way to get a per-arch constant from
> user code anyway)

But that's just _wrong_.

There _is_ a sane way to get the per-arch constant, and there has been for 
a long long time.

The kernel exports it with the AT_CLKTCK ELF auxiliary note to every ELF
binary ever loaded, and I think glibc in turn exports that value through
the regular sysconf(_SC_CLK_TCK) thing. (Yeah, I disagree with some of the
glibc sysconf implementation, but it sure should be there, and it's
documented).

If that doesn't work, then it's a glibc bug (well, in theory there could
be a kernel bug too, but since it's a one-liner in the kernel I really
doubt it).

		Linus


  parent reply	other threads:[~2002-07-15 18:51 UTC|newest]

Thread overview: 76+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2002-07-11  2:46 HZ, preferably as small as possible Grover, Andrew
2002-07-11  3:01 ` Jeff Garzik
2002-07-11 11:45   ` Alan Cox
2002-07-11 17:08   ` Martin Dalecki
2002-07-11 19:21     ` Albert D. Cahalan
2002-07-16  9:17       ` Kai Henningsen
2002-07-11 20:34     ` Bill Davidsen
2002-07-12 12:01       ` Martin Dalecki
2002-07-15  5:15       ` Linus Torvalds
2002-07-15  6:56         ` Albert D. Cahalan
2002-07-15  8:24           ` Russell King
2002-07-15 15:48             ` David Mosberger
2002-07-15 18:20               ` Albert D. Cahalan
2002-07-15 18:30                 ` David Mosberger
2002-07-15 16:07             ` Albert D. Cahalan
2002-07-15 17:06               ` Russell King
2002-07-15 18:43                 ` Albert D. Cahalan
2002-07-15 18:53                   ` Russell King
2002-07-15 18:50               ` Linus Torvalds [this message]
2002-07-15 20:15                 ` Albert D. Cahalan
2002-07-15  8:58         ` Dave Mielke
2002-07-11  7:09 ` george anzinger
  -- strict thread matches above, loose matches on Subject: below --
2002-07-10 19:59 Grover, Andrew
2002-07-10 21:09 ` george anzinger
2002-07-11  6:03   ` Hannu Savolainen
2002-07-11  7:15     ` george anzinger
2002-07-12  0:36       ` Stevie O
2002-07-12  0:50         ` Thunder from the hill
2002-07-12  0:55           ` Robert Love
2002-07-12  0:58             ` Thunder from the hill
2002-07-12  1:24             ` Alan Cox
2002-07-12  1:37             ` Mark Hahn
2002-07-12  1:09         ` george anzinger
2002-07-12  1:26           ` Roland Dreier
2002-07-12 17:30             ` george anzinger
2002-07-12  1:35           ` Stevie O
2002-07-12  3:01         ` Bernd Eckenfels
2002-07-11 12:54     ` Thunder from the hill
2002-07-11 15:59       ` Martin Dalecki
2002-07-10 21:28 ` Andrew Morton
2002-07-10 21:35   ` Benjamin LaHaise
2002-07-10 21:38     ` Andrew Morton
2002-07-10 21:42       ` Benjamin LaHaise
2002-07-11  2:14         ` CaT
2002-07-11 17:01     ` Martin Dalecki
2002-07-10 22:01   ` Thunder from the hill
2002-07-10 22:09     ` Cort Dougan
2002-07-10 22:41     ` Thunder from the hill
2002-07-10 22:47       ` Thunder from the hill
2002-07-10 22:49       ` Eli Carter
2002-07-10 23:05         ` Thunder from the hill
2002-07-10 23:08       ` Dave Mielke
2002-07-10 23:13         ` Thunder from the hill
2002-07-10 23:50     ` J.A. Magallon
2002-07-11  0:28   ` Lincoln Dale
2002-07-11 11:35     ` Kasper Dupont
2002-07-11 12:30       ` Alan Cox
2002-07-11 13:37         ` Kasper Dupont
2002-07-11 15:46           ` Alan Cox
2002-07-11 18:51       ` george anzinger
2002-07-15  5:06 ` Linus Torvalds
2002-07-15 16:26   ` Robert Love
2002-07-15 18:56     ` Linus Torvalds
2002-07-15 19:52       ` mbs
2002-07-15 20:01         ` yodaiken
2002-07-16 11:41   ` Vojtech Pavlik
2002-07-17 19:33   ` Daniel Phillips
2002-07-17 20:31     ` Richard B. Johnson
2002-07-17 20:40       ` Daniel Phillips
2002-07-17 21:02         ` Richard B. Johnson
2002-07-17 21:02       ` Linus Torvalds
2002-07-17 21:16         ` Daniel Phillips
2002-07-18 12:57         ` Richard B. Johnson
2002-07-18 13:25           ` Daniel Phillips
2002-07-18 10:10       ` Kai Henningsen
2002-07-17 20:55     ` Linus Torvalds

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