linux-kernel - Re: Serious problem with ticket spinlocks on ia64

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Message-ID: <20100827145231.GZ18967@zorg.emea.sgi.com>
Date:	Fri, 27 Aug 2010 15:52:31 +0100
From:	Hedi Berriche <hedi@....com>
To:	Petr Tesarik <ptesarik@...e.cz>
Cc:	linux-ia64@...r.kernel.org, linux-kernel@...r.kernel.org,
	Tony Luck <tony.luck@...el.com>
Subject: Re: Serious problem with ticket spinlocks on ia64

On Fri, Aug 27, 2010 at 15:40 Petr Tesarik wrote:
| On Friday 27 of August 2010 16:31:35 Hedi Berriche wrote:
|
| > That said, I'm letting my already over 36 hours run carry on chewing CPU
| > time, and see if it will eventually trip the same problem seen with 4-byte
| > ticket locks.
| 
| Hm, this doesn't sound like a viable approach. Since the siglock gets 
| initialized to 0 when a new process is started, it may never actually wrap 
| around.
| 
| I would rather attach a SystemTap probe somewhere during process fork and add 
| a bias to the siglock. That should work fine. Let me knock up the SystemTap 
| script...

That would be nice. Ta!

Cheers,
Hedi.
-- 
Hedi Berriche
Global Product Support
http://www.sgi.com/support
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