From: Rik van Riel riel@surriel.com
mainline inclusion from mainline-6.7 commit efa7df3e3bb5da8e6abbe37727417f32a37fba47 category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/I98AW9 CVE: NA
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Align larger anonymous memory mappings on THP boundaries by going through thp_get_unmapped_area if THPs are enabled for the current process.
With this patch, larger anonymous mappings are now THP aligned. When a malloc library allocates a 2MB or larger arena, that arena can now be mapped with THPs right from the start, which can result in better TLB hit rates and execution time.
Link: https://lkml.kernel.org/r/20220809142457.4751229f@imladris.surriel.com Link: https://lkml.kernel.org/r/20231214223423.1133074-1-yang@os.amperecomputing.c... Signed-off-by: Rik van Riel riel@surriel.com Reviewed-by: Yang Shi shy828301@gmail.com Cc: Matthew Wilcox willy@infradead.org Cc: Christopher Lameter cl@linux.com Signed-off-by: Andrew Morton akpm@linux-foundation.org (cherry picked from commit efa7df3e3bb5da8e6abbe37727417f32a37fba47) Signed-off-by: Kefeng Wang wangkefeng.wang@huawei.com --- mm/mmap.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/mm/mmap.c b/mm/mmap.c index 8b5295653475..6cd1ccb79193 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -1850,6 +1850,9 @@ get_unmapped_area(struct file *file, unsigned long addr, unsigned long len, */ pgoff = 0; get_area = shmem_get_unmapped_area; + } else if (IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE)) { + /* Ensures that larger anonymous mappings are THP aligned. */ + get_area = thp_get_unmapped_area; }
addr = get_area(file, addr, len, pgoff, flags);