From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: John Daiker <jdaiker@osdl.org>
Cc: John Hawkes <hawkes@sgi.com>,
Arjan van de Ven <arjan@infradead.org>,
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 17:50:38 +0100 [thread overview]
Message-ID: <1151513438.15166.41.camel@localhost.localdomain> (raw)
In-Reply-To: <44A2AA2B.3090101@osdl.org>
Ar Mer, 2006-06-28 am 09:11 -0700, ysgrifennodd John Daiker:
> people should have been using the syscall to begin with... we're just
> forcing it on them this way! :-) That's my $0.02
In the cached HZ case there will be no performance hit of measure
anyway. The bigger problem is existing user space. That is why we've
always kept the user visible HZ based values the same when changing the
kernel HZ. You can't automatically regenerate all the old binaries you
might otherwise break.
Performance is only a minor issue, and I doubt anyone who cared about
performance would be using ia-64 anyway
[Grabs coat and exits..]
next prev parent reply other threads:[~2006-06-28 16:34 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
2006-06-28 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 [this message]
-- strict thread matches above, loose matches on Subject: below --
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 17:36 Luck, Tony
2006-06-29 9:37 ` Jes Sorensen
2006-06-29 11:02 ` Alan Cox
2006-06-29 10:48 ` Jes Sorensen
2006-06-29 10:55 ` Arjan van de Ven
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 10:10 ` 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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