mm-thp-avoid-unnecessary-swapin-in-khugepaged-fix

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Cc: Andrea Arcangeli <[email protected]>
Cc: Aneesh Kumar K.V <[email protected]>
Cc: Boaz Harrosh <[email protected]>
Cc: Cyrill Gorcunov <[email protected]>
Cc: David Rientjes <[email protected]>
Cc: Ebru Akagunduz <[email protected]>
Cc: Hugh Dickins <[email protected]>
Cc: Johannes Weiner <[email protected]>
Cc: Joonsoo Kim <[email protected]>
Cc: Kirill A. Shutemov <[email protected]>
Cc: Mel Gorman <[email protected]>
Cc: Michal Hocko <[email protected]>
Cc: Naoya Horiguchi <[email protected]>
Cc: Rik van Riel <[email protected]>
Cc: Vlastimil Babka <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

mm/huge_memory.c

@@ -2486,8 +2486,8 @@ static void collapse_huge_page(struct mm_struct *mm,
 	swap = get_mm_counter(mm, MM_SWAPENTS);
 	curr_allocstall = sum_vm_event(ALLOCSTALL);
 	/*
-	 * When system under pressure, don't swapin readahead.
-	 * So that avoid unnecessary resource consuming.
+	 * Don't perform swapin readahead when the system is under pressure,
+	 * to avoid unnecessary resource consumption.
 	 */
 	if (allocstall == curr_allocstall && swap != 0)
 		__collapse_huge_page_swapin(mm, vma, address, pmd);