From: William Lee Irwin III <wli@holomorphy.com>
To: "Chen, Kenneth W" <kenneth.w.chen@intel.com>
Cc: 'Adam Litke' <agl@us.ibm.com>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [PATCH 2/2] hugetlb: synchronize alloc with page cache insert
Date: Wed, 11 Jan 2006 17:05:02 -0800 [thread overview]
Message-ID: <20060112010502.GG9091@holomorphy.com> (raw)
In-Reply-To: <200601120040.k0C0ebg02818@unix-os.sc.intel.com>
On Wed, Jan 11, 2006 at 04:40:37PM -0800, Chen, Kenneth W wrote:
> What if two processes fault on the same page and races with find_lock_page(),
> both find page not in the page cache. The process won the race proceed to
> allocate last hugetlb page. While the other will exit with SIGBUS.
> In theory, both processes should be OK.
This is supposed to fix the incarnation of that as a preexisting
problem, but you're right, there is no fallback or retry for the case
of hugepage queue exhaustion. For some reason I saw a phantom page
allocator fallback in the hugepage allocator changes.
Looks like back to the drawing board for this pair of patches, though
I'd be more than happy to get a solution to this.
-- wli
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next prev parent reply other threads:[~2006-01-12 1:05 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-01-10 19:22 Hugetlb: Shared memory race Adam Litke
2006-01-10 19:44 ` William Lee Irwin III
2006-01-11 22:02 ` [PATCH 1/2] hugetlb: Delay page zeroing for faulted pages Adam Litke
2006-01-11 22:24 ` [PATCH 2/2] hugetlb: synchronize alloc with page cache insert Adam Litke
2006-01-11 22:52 ` William Lee Irwin III
2006-01-11 23:03 ` Adam Litke
2006-01-11 23:24 ` William Lee Irwin III
2006-01-11 23:46 ` Chen, Kenneth W
2006-01-12 0:40 ` Chen, Kenneth W
2006-01-12 1:05 ` William Lee Irwin III [this message]
2006-01-12 17:26 ` Adam Litke
2006-01-12 19:07 ` Chen, Kenneth W
2006-01-12 19:48 ` Adam Litke
2006-01-12 20:06 ` Chen, Kenneth W
2006-01-11 22:42 ` [PATCH 1/2] hugetlb: Delay page zeroing for faulted pages William Lee Irwin III
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