The patch titled
Subject: mm/memory.c: improve readability of clear_huge_page
has been added to the -mm tree. Its filename is
mm-clear-to-access-sub-page-last-when-clearing-huge-page-fix.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-clear-to-access-sub-page-last-when-clearing-huge-page-fix.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-clear-to-access-sub-page-last-when-clearing-huge-page-fix.patch
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------------------------------------------------------
From: Huang Ying <ying.huang@xxxxxxxxx>
Subject: mm/memory.c: improve readability of clear_huge_page
The optimized clear_huge_page() isn't easy to read and understand. This
is suggested by Michael Hocko to improve it.
Link: http://lkml.kernel.org/r/20170830051842.1397-1-ying.huang@xxxxxxxxx
Signed-off-by: "Huang, Ying" <ying.huang@xxxxxxxxx>
Suggested-by: Michal Hocko <mhocko@xxxxxxxx>
Acked-by: Michal Hocko <mhocko@xxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/memory.c | 11 +++++++----
1 file changed, 7 insertions(+), 4 deletions(-)
diff -puN mm/memory.c~mm-clear-to-access-sub-page-last-when-clearing-huge-page-fix mm/memory.c
--- a/mm/memory.c~mm-clear-to-access-sub-page-last-when-clearing-huge-page-fix
+++ a/mm/memory.c
@@ -4447,12 +4447,15 @@ void clear_huge_page(struct page *page,
* towards the sub-page to access
*/
for (i = 0; i < l; i++) {
+ int left_idx = base + i;
+ int right_idx = base + 2 * l - 1 - i;
+
cond_resched();
- clear_user_highpage(page + base + i,
- addr + (base + i) * PAGE_SIZE);
+ clear_user_highpage(page + left_idx,
+ addr + left_idx * PAGE_SIZE);
cond_resched();
- clear_user_highpage(page + base + 2 * l - 1 - i,
- addr + (base + 2 * l - 1 - i) * PAGE_SIZE);
+ clear_user_highpage(page + right_idx,
+ addr + right_idx * PAGE_SIZE);
}
}
_
Patches currently in -mm which might be from ying.huang@xxxxxxxxx are
mm-thp-swap-support-to-clear-swap-cache-flag-for-thp-swapped-out.patch
mm-thp-swap-support-to-reclaim-swap-space-for-thp-swapped-out.patch
mm-thp-swap-support-to-reclaim-swap-space-for-thp-swapped-out-fix.patch
mm-thp-swap-make-reuse_swap_page-works-for-thp-swapped-out.patch
mm-thp-swap-make-reuse_swap_page-works-for-thp-swapped-out-fix.patch
mm-thp-swap-dont-allocate-huge-cluster-for-file-backed-swap-device.patch
block-thp-make-block_device_operationsrw_page-support-thp.patch
test-code-to-write-thp-to-swap-device-as-a-whole.patch
mm-thp-swap-support-to-split-thp-for-thp-swapped-out.patch
memcg-thp-swap-support-move-mem-cgroup-charge-for-thp-swapped-out.patch
memcg-thp-swap-avoid-to-duplicated-charge-thp-in-swap-cache.patch
memcg-thp-swap-make-mem_cgroup_swapout-support-thp.patch
mm-thp-swap-delay-splitting-thp-after-swapped-out.patch
mm-thp-swap-add-thp-swapping-out-fallback-counting.patch
mm-swap-add-swap-readahead-hit-statistics.patch
mm-swap-fix-swap-readahead-marking.patch
mm-swap-vma-based-swap-readahead.patch
mm-swap-add-sysfs-interface-for-vma-based-swap-readahead.patch
mm-swap-dont-use-vma-based-swap-readahead-if-hdd-is-used-as-swap.patch
mm-clear-to-access-sub-page-last-when-clearing-huge-page.patch
mm-clear-to-access-sub-page-last-when-clearing-huge-page-fix.patch
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