From: Andi Kleen <ak@muc.de>
To: "Luck, Tony" <tony.luck@intel.com>
Cc: akpm@osdl.org, linux-arch@vger.kernel.org, mingo@elte.hu
Subject: Re: [patch 1/1] Fix spinlock debugging delays to not time out too early
Date: Tue, 7 Feb 2006 19:29:24 +0100 [thread overview]
Message-ID: <200602071929.24762.ak@muc.de> (raw)
In-Reply-To: <B8E391BBE9FE384DAA4C5C003888BE6F05A3DB05@scsmsx401.amr.corp.intel.com>
On Tuesday 07 February 2006 19:20, Luck, Tony wrote:
> > The fix is to include a __delay(1) call in the loop, to correctly approximate
> > the intended delay timeout of 1 second. The code assumes that every
> > architecture implements __delay(1) to last around 1/(loops_per_jiffy*HZ)
> > seconds.
>
> But we calculate loops_per_jiffy based on somewhat larger vales passed
> to __delay() ... where the function call overhead is amortized away.
>
> I'd expect that __delay(1) would last quite a bit longer than
> 1/(loops_per_jiffy * HZ) ... so we'll wait a lot more than a
> second.
For this case that would be ok, as long as it isn't a hour or so,
but let's say < 1 minute.
-Andi
next prev parent reply other threads:[~2006-02-07 18:31 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-02-07 18:20 [patch 1/1] Fix spinlock debugging delays to not time out too early Luck, Tony
2006-02-07 18:29 ` Andi Kleen [this message]
2006-02-07 18:44 ` Luck, Tony
2006-02-07 19:14 ` Ingo Molnar
2006-02-07 19:37 ` Andi Kleen
-- strict thread matches above, loose matches on Subject: below --
2006-02-07 17:41 akpm
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