From: Matthew Wilcox <willy@debian.org>
To: "Van Maren, Kevin" <kevin.vanmaren@unisys.com>
Cc: "'Matthew Wilcox'" <willy@debian.org>,
"'linux-kernel@vger.kernel.org'" <linux-kernel@vger.kernel.org>,
"'linux-ia64@linuxia64.org'" <linux-ia64@linuxia64.org>
Subject: Re: [Linux-ia64] Linux kernel deadlock caused by spinlock bug
Date: Mon, 29 Jul 2002 22:18:49 +0100 [thread overview]
Message-ID: <20020729221849.C3317@parcelfarce.linux.theplanet.co.uk> (raw)
In-Reply-To: <3FAD1088D4556046AEC48D80B47B478C0101F3AE@usslc-exch-4.slc.unisys.com>; from kevin.vanmaren@unisys.com on Mon, Jul 29, 2002 at 04:05:35PM -0500
On Mon, Jul 29, 2002 at 04:05:35PM -0500, Van Maren, Kevin wrote:
> Recursive read locks certainly make it more difficult to fix the
> problem. Placing a band-aid on gettimeofday will fix the symptom
> in one location, but will not fix the general problem, which is
> writer starvation with heavy read lock load. The only way to fix
> that is to make writer locks fair or to eliminate them (make them
> _all_ stateless).
The basic principle is that if you see contention on a spinlock, you
should eliminate the spinlock somehow. making spinlocks `fair' doesn't
help that you're spending lots of time spinning on a lock.
--
Revolutions do not require corporate support.
next prev parent reply other threads:[~2002-07-29 21:15 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-07-29 21:05 Van Maren, Kevin
2002-07-29 21:18 ` Matthew Wilcox [this message]
2002-07-30 15:58 ` Russell Lewis
2002-07-30 16:56 ` Richard B. Johnson
2002-07-30 17:02 ` Russell Lewis
2002-07-30 17:14 ` Richard B. Johnson
2002-07-30 22:48 ` Sean Griffin
2002-07-31 17:37 ` Russell Lewis
-- strict thread matches above, loose matches on Subject: below --
2002-07-30 21:15 Van Maren, Kevin
2002-07-30 17:06 Van Maren, Kevin
2002-07-30 17:44 ` William Lee Irwin III
[not found] <3FAD1088D4556046AEC48D80B47B478C0101F3AE@usslc-exch-4.slc.unisys.com.suse.lists.linux.kernel>
2002-07-30 13:32 ` Andi Kleen
2002-07-30 16:27 ` William Lee Irwin III
2002-07-29 21:29 Van Maren, Kevin
2002-07-29 21:48 ` David Mosberger
2002-07-29 20:37 Van Maren, Kevin
2002-07-29 20:46 ` [Linux-ia64] " Matthew Wilcox
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