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| author | Rik van Riel <riel@surriel.com> | 2023-12-14 23:34:23 +0100 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2023-12-29 20:06:47 +0100 |
| commit | efa7df3e3bb5da8e6abbe37727417f32a37fba47 (patch) | |
| tree | f3a86329a295dc5d80b9e702d110719424651644 /mm/mmap.c | |
| parent | mailmap: add an old address for Naoya Horiguchi (diff) | |
| download | linux-efa7df3e3bb5da8e6abbe37727417f32a37fba47.tar.xz linux-efa7df3e3bb5da8e6abbe37727417f32a37fba47.zip | |
mm: align larger anonymous mappings on THP boundaries
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.com
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>
Diffstat (limited to 'mm/mmap.c')
| -rw-r--r-- | mm/mmap.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/mm/mmap.c b/mm/mmap.c index 1971bfffcc03..aa82eec17489 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -1829,6 +1829,9 @@ 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); |