On 04/05/2013 04:59 AM, Kirill A. Shutemov wrote:
> + if (unlikely(khugepaged_enter(vma)))
> + return VM_FAULT_OOM;
...
> + ret = vma->vm_ops->huge_fault(vma, &vmf);
> + if (unlikely(ret & VM_FAULT_OOM))
> + goto uncharge_out_fallback;
> + if (unlikely(ret & (VM_FAULT_ERROR | VM_FAULT_NOPAGE | VM_FAULT_RETRY)))
> + goto uncharge_out;
> +
> + if (unlikely(PageHWPoison(vmf.page))) {
> + if (ret & VM_FAULT_LOCKED)
> + unlock_page(vmf.page);
> + ret = VM_FAULT_HWPOISON;
> + goto uncharge_out;
> + }
One note on all these patches, but especially this one is that I think
they're way too liberal with unlikely()s. You really don't need to do
this for every single error case. Please reserve them for places where
you _know_ there is a benefit, or that the compiler is doing things that
you _know_ are blatantly wrong.
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