Re: [PATCH V2] mm: fix kernel crash in khugepaged thread
From: yalin wang
Date: Thu Nov 12 2015 - 02:15:16 EST
i will send a V3 patch.
> On Nov 5, 2015, at 16:50, Kirill A. Shutemov <kirill@xxxxxxxxxxxxx> wrote:
> On Thu, Nov 05, 2015 at 09:12:34AM +0100, Vlastimil Babka wrote:
>> On 10/29/2015 01:35 AM, Kirill A. Shutemov wrote:
>>>> @@ -2605,9 +2603,9 @@ out_unmap:
>>>> /* collapse_huge_page will return with the mmap_sem released */
>>>> collapse_huge_page(mm, address, hpage, vma, node);
>>>> - trace_mm_khugepaged_scan_pmd(mm, page_to_pfn(page), writable, referenced,
>>>> - none_or_zero, result, unmapped);
>>>> + trace_mm_khugepaged_scan_pmd(mm, pte_present(pteval) ?
>>>> + pte_pfn(pteval) : -1, writable, referenced,
>>>> + none_or_zero, result, unmapped);
>>> maybe passing down pte instead of pfn?
>> Maybe just pass the page, and have tracepoint's fast assign check for !NULL and
>> do page_to_pfn itself? That way the complexity and overhead is only in the
>> tracepoint and when enabled.
> Kirill A. Shutemov
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