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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2022-12-04 12:51:59 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2022-12-04 12:51:59 -0800 |
| commit | 0ba09b1733878afe838fe35c310715fda3d46428 (patch) | |
| tree | 3e5e9a8d7f2c84233b65fc9cc88672d536425994 | |
| parent | 23393c6461422df5bf8084a086ada9a7e17dc2ba (diff) | |
| download | linux-0ba09b1733878afe838fe35c310715fda3d46428.tar.gz linux-0ba09b1733878afe838fe35c310715fda3d46428.tar.bz2 linux-0ba09b1733878afe838fe35c310715fda3d46428.zip | |
Revert "mm: align larger anonymous mappings on THP boundaries"
This reverts commit f35b5d7d676e59e401690b678cd3cfec5e785c23.
It has been reported to cause huge performance regressions on some loads
(will-it-scale.per_process_ops, but also building the kernel with
clang).
The commit did speed up gcc builds by a small amount, so it's not an
unambiguous regression, but until the big regressions are understood,
let's revert it.
Reported-by: kernel test robot <yujie.liu@intel.com>
Link: https://lore.kernel.org/r/202210181535.7144dd15-yujie.liu@intel.com
Reported-by: Nathan Chancellor <nathan@kernel.org>
Link: https://lore.kernel.org/lkml/Y1DNQaoPWxE%2BrGce@dev-arch.thelio-3990X/
Cc: Huang, Ying <ying.huang@intel.com>
Cc: Rik van Riel <riel@surriel.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Yang Shi <shy828301@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | mm/mmap.c | 3 |
1 files changed, 0 insertions, 3 deletions
diff --git a/mm/mmap.c b/mm/mmap.c index 74a84eb33b90..a5eb2f175da0 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -1779,9 +1779,6 @@ 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); |