On 08/27/2017 05:48 AM, Kirill A. Shutemov wrote: >> + /* Transparent huge pages are not supported. */ >> + if (unlikely(pmd_trans_huge(*pmd))) >> + goto out_walk; > That's looks like a blocker to me. > > Is there any problem with making it supported (besides plain coding)? IIUC we would have to reattempt once for each PMD level fault because of the lack of a page table entry there. Besides do we want to support huge pages in general as part of speculative page fault path ? The number of faults will be very less (256 times lower on POWER and 512 times lower on X86). So is it worth it ? BTW calling hugetlb_fault() after figuring out the VMA, works correctly inside handle_speculative _fault() last time I checked. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>
