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

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Message-ID: <AANLkTikZRiQ5jCpgp42LxtXb_S52sSUy7KP_=vZ3z4Tf@mail.gmail.com>
Date:	Fri, 3 Sep 2010 08:50:53 -0700
From:	Tony Luck <tony.luck@...il.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>
Subject: Re: Serious problem with ticket spinlocks on ia64

On Fri, Sep 3, 2010 at 7:52 AM, Petr Tesarik <ptesarik@...e.cz> wrote:
> Anyway, if a global TLB flush is necessary to trigger the bug, it would also
> explain why we couldn't reproduce it in user-space.

Perhaps ... I did explore the TLB in one variant of my user mode test I added
a pointer-chasing routine that looked at enough pages to clear out the TLB.
Not quite the same as a flush - but close.  It didn't help at all.

-Tony
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