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

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Message-ID: <987664A83D2D224EAE907B061CE93D53015D91D604@orsmsx505.amr.corp.intel.com>
Date:	Fri, 27 Aug 2010 16:26:47 -0700
From:	"Luck, Tony" <tony.luck@...el.com>
To:	Petr Tesarik <ptesarik@...e.cz>
CC:	"linux-ia64@...r.kernel.org" <linux-ia64@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Hedi Berriche <hedi@....com>
Subject: RE: Serious problem with ticket spinlocks on ia64

Debugging this in the kernel seemed hard ... so I tried to construct a
user level test using the same code from the kernel. See attached. But
this fails so catastrophically with any number of threads greater than
one, that I suspect I made some mistake cut & pasting the relevant bits
of kernel infrastructure.  The goal of the program is to have several
child processes pounding on a lock while the parent looks in every 5
seconds to see if they are making progress.

-Tony

View attachment "spinwrap.c" of type "text/plain" (7081 bytes)