Messages in this thread Patch in this message | | | From | Yang Shi <> | Subject | [RESEND PATCH] mm: align larger anonymous mappings on THP boundaries | Date | Thu, 14 Dec 2023 14:34:23 -0800 |
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From: Rik van Riel <riel@surriel.com>
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 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> --- This patch was applied to v6.1, but was reverted due to a regression report. However it turned out the regression was not due to this patch. I ping'ed Andrew to reapply this patch, Andrew may forget it. This patch helps promote THP, so I rebased it onto the latest mm-unstable.
mm/mmap.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/mm/mmap.c b/mm/mmap.c index 9d780f415be3..dd25a2aa94f7 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -2232,6 +2232,9 @@ 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); -- 2.41.0
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