The patch titled
Subject: mm, thp: fix mlock statistics
has been added to the -mm tree. Its filename is
mm-thp-fix-mlock-statistics.patch
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------------------------------------------------------
From: David Rientjes <rientjes@xxxxxxxxxx>
Subject: mm, thp: fix mlock statistics
NR_MLOCK is only accounted in single page units: there's no logic to
handle transparent hugepages. This patch checks the appropriate number of
pages to adjust the statistics by so that the correct amount of memory is
reflected.
Currently:
$ grep Mlocked /proc/meminfo
Mlocked: 19636 kB
#define MAP_SIZE (4 << 30) /* 4GB */
void *ptr = mmap(NULL, MAP_SIZE, PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANONYMOUS, 0, 0);
mlock(ptr, MAP_SIZE);
$ grep Mlocked /proc/meminfo
Mlocked: 29844 kB
munlock(ptr, MAP_SIZE);
$ grep Mlocked /proc/meminfo
Mlocked: 19636 kB
And with this patch:
$ grep Mlock /proc/meminfo
Mlocked: 19636 kB
mlock(ptr, MAP_SIZE);
$ grep Mlock /proc/meminfo
Mlocked: 4213664 kB
munlock(ptr, MAP_SIZE);
$ grep Mlock /proc/meminfo
Mlocked: 19636 kB
Signed-off-by: David Rientjes <rientjes@xxxxxxxxxx>
Reported-by: Hugh Dickens <hughd@xxxxxxxxxx>
Acked-by: Hugh Dickins <hughd@xxxxxxxxxx>
Reviewed-by: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Cc: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Reviewed-by: Michel Lespinasse <walken@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/internal.h | 3 ++-
mm/mlock.c | 6 ++++--
2 files changed, 6 insertions(+), 3 deletions(-)
diff -puN mm/internal.h~mm-thp-fix-mlock-statistics mm/internal.h
--- a/mm/internal.h~mm-thp-fix-mlock-statistics
+++ a/mm/internal.h
@@ -180,7 +180,8 @@ static inline int mlocked_vma_newpage(st
return 0;
if (!TestSetPageMlocked(page)) {
- inc_zone_page_state(page, NR_MLOCK);
+ mod_zone_page_state(page_zone(page), NR_MLOCK,
+ hpage_nr_pages(page));
count_vm_event(UNEVICTABLE_PGMLOCKED);
}
return 1;
diff -puN mm/mlock.c~mm-thp-fix-mlock-statistics mm/mlock.c
--- a/mm/mlock.c~mm-thp-fix-mlock-statistics
+++ a/mm/mlock.c
@@ -78,7 +78,8 @@ void mlock_vma_page(struct page *page)
BUG_ON(!PageLocked(page));
if (!TestSetPageMlocked(page)) {
- inc_zone_page_state(page, NR_MLOCK);
+ mod_zone_page_state(page_zone(page), NR_MLOCK,
+ hpage_nr_pages(page));
count_vm_event(UNEVICTABLE_PGMLOCKED);
if (!isolate_lru_page(page))
putback_lru_page(page);
@@ -105,7 +106,8 @@ void munlock_vma_page(struct page *page)
BUG_ON(!PageLocked(page));
if (TestClearPageMlocked(page)) {
- dec_zone_page_state(page, NR_MLOCK);
+ mod_zone_page_state(page_zone(page), NR_MLOCK,
+ -hpage_nr_pages(page));
if (!isolate_lru_page(page)) {
int ret = SWAP_AGAIN;
_
Patches currently in -mm which might be from rientjes@xxxxxxxxxx are
origin.patch
linux-next.patch
acpi_memhotplugc-fix-memory-leak-when-memory-device-is-unbound-from-the-module-acpi_memhotplug.patch
acpi_memhotplugc-free-memory-device-if-acpi_memory_enable_device-failed.patch
acpi_memhotplugc-remove-memory-info-from-list-before-freeing-it.patch
acpi_memhotplugc-dont-allow-to-eject-the-memory-device-if-it-is-being-used.patch
acpi_memhotplugc-bind-the-memory-device-when-the-driver-is-being-loaded.patch
acpi_memhotplugc-auto-bind-the-memory-device-which-is-hotplugged-before-the-driver-is-loaded.patch
mm-mmapc-replace-find_vma_prepare-with-clearer-find_vma_links-fix.patch
oom-remove-deprecated-oom_adj.patch
thp-fix-the-count-of-thp_collapse_alloc.patch
thp-remove-unnecessary-check-in-start_khugepaged.patch
thp-move-khugepaged_mutex-out-of-khugepaged.patch
thp-remove-unnecessary-khugepaged_thread-check.patch
thp-remove-wake_up_interruptible-in-the-exit-path.patch
thp-remove-some-code-depend-on-config_numa.patch
thp-merge-page-pre-alloc-in-khugepaged_loop-into-khugepaged_do_scan.patch
thp-release-page-in-page-pre-alloc-path.patch
thp-introduce-khugepaged_prealloc_page-and-khugepaged_alloc_page.patch
thp-remove-khugepaged_loop.patch
thp-use-khugepaged_enabled-to-remove-duplicate-code.patch
thp-remove-unnecessary-set_recommended_min_free_kbytes.patch
mm-page_alloc-refactor-out-__alloc_contig_migrate_alloc.patch
memory-hotplug-dont-replace-lowmem-pages-with-highmem.patch
thp-khugepaged_prealloc_page-forgot-to-reset-the-page-alloc-indicator.patch
mm-fix-up-zone-present-pages.patch
mm-numa-reclaim-from-all-nodes-within-reclaim-distance.patch
mm-numa-reclaim-from-all-nodes-within-reclaim-distance-fix.patch
mm-numa-reclaim-from-all-nodes-within-reclaim-distance-fix-fix.patch
hugetlb-do-not-use-vma_hugecache_offset-for-vma_prio_tree_foreach.patch
mm-revert-0def08e3-mm-mempolicyc-check-return-code-of-check_range.patch
mm-revert-0def08e3-mm-mempolicyc-check-return-code-of-check_range-fix.patch
kpageflags-fix-wrong-kpf_thp-on-non-huge-compound-pages.patch
memory-hotplug-preparation-to-notify-memory-blocks-state-at-memory-hot-remove.patch
memory-hotplug-update-memory-blocks-state-and-notfy-theinformation-to-userspace.patch
mm-huge_memoryc-fix-build-warning-for-uma-kernels.patch
mm-thp-fix-mapped-pages-avoiding-unevictable-list-on-mlock.patch
mm-thp-fix-mlock-statistics.patch
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