From: Joel Becker <Joel.Becker@oracle.com>
To: john stultz <johnstul@us.ibm.com>
Cc: lkml <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH][2.5] hangcheck-timer
Date: Tue, 21 Jan 2003 09:29:41 -0800 [thread overview]
Message-ID: <20030121172941.GT20972@ca-server1.us.oracle.com> (raw)
In-Reply-To: <1043117157.32472.116.camel@w-jstultz2.beaverton.ibm.com>
On Mon, Jan 20, 2003 at 06:45:57PM -0800, john stultz wrote:
> > I'll look into it, but it must absolutely be in terms of wall
> > clock time as measured from outside the system.
>
> Completely understandable. do_gettimeofday will give you just that (w/o
> the conversion muck w/ HZ and loops_per_jiffy).
It looks as though gettimeofday calculates wall time from
jiffies. If you udelay(), jiffies doesn't increment and you lose time
(this is exactly what I'm trying to track here). How does gettimeofday
avoid this (maybe I'm misreading the code)?
Joel
--
"Can any of you seriously say the Bill of Rights could get through
Congress today? It wouldn't even get out of committee."
- F. Lee Bailey
Joel Becker
Senior Member of Technical Staff
Oracle Corporation
E-mail: joel.becker@oracle.com
Phone: (650) 506-8127
next prev parent reply other threads:[~2003-01-21 17:20 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <200301210135.h0L1ZFa06867@eng2.beaverton.ibm.com>
2003-01-21 1:42 ` [PATCH][2.5] hangcheck-timer john stultz
2003-01-21 2:00 ` Joel Becker
2003-01-21 2:45 ` john stultz
2003-01-21 17:29 ` Joel Becker [this message]
2003-01-21 20:03 ` john stultz
2003-01-21 20:30 ` Joel Becker
2003-01-21 1:19 Joel Becker
2003-01-21 8:11 ` Christoph Hellwig
2003-01-21 17:33 ` Joel Becker
2003-01-21 12:50 ` Dave Jones
2003-01-21 17:40 ` Joel Becker
2003-01-21 17:42 ` Dave Jones
2003-01-21 18:42 ` Joel Becker
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