Messages in this thread | | | Subject | RE: [PATCH 2/3 htlb-fault] Demand faulting for hugetlb | From | Adam Litke <> | Date | Wed, 07 Sep 2005 09:04:00 -0500 |
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On Wed, 2005-09-07 at 10:33 +0800, Zhang, Yanmin wrote: > >>-----Original Message----- > >>From: linux-kernel-owner@vger.kernel.org > >>[mailto:linux-kernel-owner@vger.kernel.org] On Behalf Of Adam Litke > >>Sent: Wednesday, September 07, 2005 5:59 AM > >>To: linux-kernel@vger.kernel.org > >>Cc: ADAM G. LITKE [imap] > >>Subject: Re: [PATCH 2/3 htlb-fault] Demand faulting for hugetlb > > >>+retry: > >>+ page = find_get_page(mapping, idx); > >>+ if (!page) { > >>+ /* charge the fs quota first */ > >>+ if (hugetlb_get_quota(mapping)) { > >>+ ret = VM_FAULT_SIGBUS; > >>+ goto out; > >>+ } > >>+ page = alloc_huge_page(); > >>+ if (!page) { > >>+ hugetlb_put_quota(mapping); > >>+ ret = VM_FAULT_SIGBUS; > >>+ goto out; > >>+ } > >>+ if (add_to_page_cache(page, mapping, idx, GFP_ATOMIC)) { > > Here you lost hugetlb_put_quota(mapping);
Whoops, thanks for catching that.
> >>+ put_page(page); > >>+ goto retry; > >>+ } > >>+ unlock_page(page); > > As for regular pages, kernel is used to unlock mm-> page_table_lock > before find_get_page and relock it before setting pte. Why isn't the > style followed by huge page fault?
As far as I can tell, we should be able to do that for large pages as well. I'll give it a spin.
-- Adam Litke - (agl at us.ibm.com) IBM Linux Technology Center
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