linux-kernel - Re: Problem with global_flush_tlb() on i386 in 2.6.22-rc4-mm2

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Date:	Tue, 19 Jun 2007 21:49:24 -0400
From:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
To:	Anthony Liguori <anthony@...emonkey.ws>
Cc:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	mbligh@...gle.com
Subject: Re: Problem with global_flush_tlb() on i386 in 2.6.22-rc4-mm2

* Anthony Liguori (anthony@...emonkey.ws) wrote:

> This is actually very conservative seeing as how disabling CR4.PGE 
> should be sufficient to flush global pages on modern processors.  I 
> suspect you're getting preempted while it's running.
> 

Sorry, I just realized that I rejected your preemption explanation
without explaining why:

1 - In my "Text Section" lock code, which is the original place where I
triggered the problem, I take a spinlock around these operations, which
disables preemption.

2 - My sample module plays alone in its own data structures: there is
only one thread accessing the data at a given time (because I do only
one file open at a given time, which I control).

Regards,

Mathieu

-- 
Mathieu Desnoyers
Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68
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