linux-kernel - Re: How best to pin pages in physical memory?

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Date:	Mon, 27 Sep 2010 09:36:09 +0100
From:	Chris Wilson <chris@...is-wilson.co.uk>
To:	Hugh Dickins <hughd@...gle.com>
Cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Rik van Riel <riel@...hat.com>,
	Christoph Hellwig <hch@...radead.org>
Subject: Re: How best to pin pages in physical memory?

On Sun, 26 Sep 2010 16:29:23 -0700 (PDT), Hugh Dickins <hughd@...gle.com> wrote:
> If i915_get_object_get_pages() isn't doing its job, I think you need to
> wonder why not - maybe somewhere doing a put_page or page_cache_release,
> freeing one or all pages too soon?

Thanks, that's a very useful bit of review. I surmised that after seeing
corruption in a batch buffer after a swap storm that the pages were not as
safe required. The fact that swapping was involved could have been a
coincidence, except for the growing number of reports from other users
reporting crashes in conjunction with swapping.

So back to seeing whether i915_gem_object_[get/put]_pages is sufficient
for our uses.
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre
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