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author | Miaohe Lin <linmiaohe@huawei.com> | 2021-05-05 04:33:46 +0300 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-05-19 11:13:07 +0300 |
commit | 14d45fb5a3fcae53df9ee0fe1e16e5c686778731 (patch) | |
tree | 655579ebb8dd9c28302c2f00e6403f119ed2a994 /mm/khugepaged.c | |
parent | 51524fa8b5f7b879ba569227738375d283b79382 (diff) | |
download | linux-14d45fb5a3fcae53df9ee0fe1e16e5c686778731.tar.xz |
khugepaged: fix wrong result value for trace_mm_collapse_huge_page_isolate()
[ Upstream commit 74e579bf231a337ab3786d59e64bc94f45ca7b3f ]
In writable and !referenced case, the result value should be
SCAN_LACK_REFERENCED_PAGE for trace_mm_collapse_huge_page_isolate()
instead of default 0 (SCAN_FAIL) here.
Link: https://lkml.kernel.org/r/20210306032947.35921-5-linmiaohe@huawei.com
Fixes: 7d2eba0557c1 ("mm: add tracepoint for scanning pages")
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Dan Carpenter <dan.carpenter@oracle.com>
Cc: Ebru Akagunduz <ebru.akagunduz@gmail.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Rik van Riel <riel@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'mm/khugepaged.c')
-rw-r--r-- | mm/khugepaged.c | 18 |
1 files changed, 9 insertions, 9 deletions
diff --git a/mm/khugepaged.c b/mm/khugepaged.c index abab394c4206..a6238118ac4c 100644 --- a/mm/khugepaged.c +++ b/mm/khugepaged.c @@ -714,17 +714,17 @@ next: if (pte_write(pteval)) writable = true; } - if (likely(writable)) { - if (likely(referenced)) { - result = SCAN_SUCCEED; - trace_mm_collapse_huge_page_isolate(page, none_or_zero, - referenced, writable, result); - return 1; - } - } else { + + if (unlikely(!writable)) { result = SCAN_PAGE_RO; + } else if (unlikely(!referenced)) { + result = SCAN_LACK_REFERENCED_PAGE; + } else { + result = SCAN_SUCCEED; + trace_mm_collapse_huge_page_isolate(page, none_or_zero, + referenced, writable, result); + return 1; } - out: release_pte_pages(pte, _pte, compound_pagelist); trace_mm_collapse_huge_page_isolate(page, none_or_zero, |