From: Christoph Lameter <clameter@sgi.com>
To: Ross Biro <rossb@google.com>
Cc: linux-mm@kvack.org
Subject: Re: RFC/Patch Make Page Tables Relocatable Part 2/2 Page Table Migration Code
Date: Mon, 7 Jan 2008 11:49:55 -0800 (PST) [thread overview]
Message-ID: <Pine.LNX.4.64.0801071149160.23617@schroedinger.engr.sgi.com> (raw)
In-Reply-To: <d43160c70801040802p2a6d96c8p406eb391cbd829e4@mail.gmail.com>
On Fri, 4 Jan 2008, Ross Biro wrote:
> Here is the code to do the actual relocation. I believe there is a
> race in this version of the code. If the relocation code sleeps while
> allocating memory and the rcu code frees the old page tables before
> the tlbflush, then if another cpu is running the process in user
> space, the page tables could be corrupted. Not really a big deal, but
> it needs to be fixed. Probably by not scheduling the rcu free until
> after all the page tables have been relocated.
Interesting approach. It moves all page table pages even if only a subset
of the address space was migrated?
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next prev parent reply other threads:[~2008-01-07 19:49 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-01-04 16:02 Ross Biro
2008-01-07 19:49 ` Christoph Lameter [this message]
2008-01-07 20:17 ` Ross Biro
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