The patch titled
Subject: mm/khugepaged: minor cleanup for collapse_file
has been added to the -mm mm-unstable branch. Its filename is
mm-khugepaged-minor-cleanup-for-collapse_file.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-khugepaged-minor-cleanup-for-collapse_file.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Miaohe Lin <linmiaohe@xxxxxxxxxx>
Subject: mm/khugepaged: minor cleanup for collapse_file
Date: Sat, 25 Jun 2022 17:28:13 +0800
nr_none is always 0 for non-shmem case because the page can be read from
the backend store. So when nr_none ! = 0, it must be in is_shmem case.
Also only adjust the nrpages and uncharge shmem when nr_none != 0 to save
cpu cycles.
Link: https://lkml.kernel.org/r/20220625092816.4856-5-linmiaohe@xxxxxxxxxx
Signed-off-by: Miaohe Lin <linmiaohe@xxxxxxxxxx>
Reviewed-by: Zach O'Keefe <zokeefe@xxxxxxxxxx>
Cc: Alistair Popple <apopple@xxxxxxxxxx>
Cc: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: David Howells <dhowells@xxxxxxxxxx>
Cc: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Cc: NeilBrown <neilb@xxxxxxx>
Cc: Peter Xu <peterx@xxxxxxxxxx>
Cc: Suren Baghdasaryan <surenb@xxxxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Yang Shi <shy828301@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/khugepaged.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
--- a/mm/khugepaged.c~mm-khugepaged-minor-cleanup-for-collapse_file
+++ a/mm/khugepaged.c
@@ -1852,8 +1852,8 @@ out_unlock:
if (nr_none) {
__mod_lruvec_page_state(new_page, NR_FILE_PAGES, nr_none);
- if (is_shmem)
- __mod_lruvec_page_state(new_page, NR_SHMEM, nr_none);
+ /* nr_none is always 0 for non-shmem. */
+ __mod_lruvec_page_state(new_page, NR_SHMEM, nr_none);
}
/* Join all the small entries into a single multi-index entry */
@@ -1917,10 +1917,10 @@ xa_unlocked:
/* Something went wrong: roll back page cache changes */
xas_lock_irq(&xas);
- mapping->nrpages -= nr_none;
-
- if (is_shmem)
+ if (nr_none) {
+ mapping->nrpages -= nr_none;
shmem_uncharge(mapping->host, nr_none);
+ }
xas_set(&xas, start);
xas_for_each(&xas, page, end - 1) {
_
Patches currently in -mm which might be from linmiaohe@xxxxxxxxxx are
mm-migration-remove-unneeded-lock-page-and-pagemovable-check.patch
mm-migration-return-errno-when-isolate_huge_page-failed.patch
mm-migration-fix-potential-pte_unmap-on-an-not-mapped-pte.patch
mm-swapfile-make-security_vm_enough_memory_mm-work-as-expected.patch
mm-swapfile-fix-possible-data-races-of-inuse_pages.patch
mm-swap-remove-swap_cache_info-statistics.patch
mm-vmscan-dont-try-to-reclaim-freed-folios.patch
mm-page_alloc-minor-clean-up-for-memmap_init_compound.patch
mm-madvise-minor-cleanup-for-swapin_walk_pmd_entry.patch
mm-mmapc-fix-missing-call-to-vm_unacct_memory-in-mmap_region.patch
mm-khugepaged-remove-unneeded-shmem_huge_enabled-check.patch
mm-khugepaged-stop-swapping-in-page-when-vm_fault_retry-occurs.patch
mm-khugepaged-trivial-typo-and-codestyle-cleanup.patch
mm-khugepaged-minor-cleanup-for-collapse_file.patch
mm-khugepaged-use-helper-macro-__attr_rw.patch
mm-khugepaged-remove-unneeded-return-value-of-khugepaged_add_pte_mapped_thp.patch
mm-khugepaged-try-to-free-transhuge-swapcache-when-possible.patch
