On Mon, 9 Apr 2012, KAMEZAWA Hiroyuki wrote:
> if (transparent_hugepage_enabled(vma) &&
> !transparent_hugepage_debug_cow())
> new_page = alloc_hugepage_vma(transparent_hugepage_defrag(vma),
> vma, haddr, numa_node_id(), 0);
> else
> new_page = NULL;
>
> if (unlikely(mem_cgroup_newpage_charge(new_page, mm, GFP_KERNEL))) {
> put_page(new_page);
> new_page = NULL; /* never OOM, just cause fallback */
> }
>
> if (unlikely(!new_page)) {
> count_vm_event(THP_FAULT_FALLBACK);
> ret = do_huge_pmd_wp_page_fallback(mm, vma, address,
> pmd, orig_pmd, page, haddr);
> put_page(page);
> goto out;
> }
This would result in the same error since do_huge_pmd_wp_page_fallback()
would fail to charge the necessary memory to the memcg.
Are you still including my change to handle_mm_fault() to retry if this
returns VM_FAULT_OOM?
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