>>-----Original Message-----
>>From: [email protected]
>>[mailto:[email protected]] On Behalf Of Adam Litke
>>Sent: Wednesday, September 07, 2005 5:59 AM
>>To: [email protected]
>>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);
>>+ 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?
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