The patch titled
Subject: mm: memcontrol: switch to native NR_FILE_PAGES and NR_SHMEM counters
has been added to the -mm tree. Its filename is
mm-memcontrol-switch-to-native-nr_file_pages-and-nr_shmem-counters.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-memcontrol-switch-to-native-nr_file_pages-and-nr_shmem-counters.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-memcontrol-switch-to-native-nr_file_pages-and-nr_shmem-counters.patch
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*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: Johannes Weiner <hannes@xxxxxxxxxxx>
Subject: mm: memcontrol: switch to native NR_FILE_PAGES and NR_SHMEM counters
Memcg maintains private MEMCG_CACHE and NR_SHMEM counters. This
divergence from the generic VM accounting means unnecessary code overhead,
and creates a dependency for memcg that page->mapping is set up at the
time of charging, so that page types can be told apart.
Convert the generic accounting sites to mod_lruvec_page_state and friends
to maintain the per-cgroup vmstat counters of NR_FILE_PAGES and NR_SHMEM.
The page is already locked in these places, so page->mem_cgroup is stable;
we only need minimal tweaks of two mem_cgroup_migrate() calls to ensure
it's set up in time.
Then replace MEMCG_CACHE with NR_FILE_PAGES and delete the private
NR_SHMEM accounting sites.
Link: http://lkml.kernel.org/r/20200508183105.225460-10-hannes@xxxxxxxxxxx
Signed-off-by: Johannes Weiner <hannes@xxxxxxxxxxx>
Reviewed-by: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>
Cc: Alex Shi <alex.shi@xxxxxxxxxxxxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Cc: "Kirill A. Shutemov" <kirill@xxxxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxx>
Cc: Roman Gushchin <guro@xxxxxx>
Cc: Shakeel Butt <shakeelb@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/memcontrol.h | 3 +--
mm/filemap.c | 17 +++++++++--------
mm/khugepaged.c | 16 +++++++++++-----
mm/memcontrol.c | 28 +++++++++++-----------------
mm/migrate.c | 15 +++++++++++----
mm/shmem.c | 14 +++++++-------
6 files changed, 50 insertions(+), 43 deletions(-)
--- a/include/linux/memcontrol.h~mm-memcontrol-switch-to-native-nr_file_pages-and-nr_shmem-counters
+++ a/include/linux/memcontrol.h
@@ -29,8 +29,7 @@ struct kmem_cache;
/* Cgroup-specific page state, on top of universal node page state */
enum memcg_stat_item {
- MEMCG_CACHE = NR_VM_NODE_STAT_ITEMS,
- MEMCG_RSS,
+ MEMCG_RSS = NR_VM_NODE_STAT_ITEMS,
MEMCG_RSS_HUGE,
MEMCG_SWAP,
MEMCG_SOCK,
--- a/mm/filemap.c~mm-memcontrol-switch-to-native-nr_file_pages-and-nr_shmem-counters
+++ a/mm/filemap.c
@@ -199,9 +199,9 @@ static void unaccount_page_cache_page(st
nr = hpage_nr_pages(page);
- __mod_node_page_state(page_pgdat(page), NR_FILE_PAGES, -nr);
+ __mod_lruvec_page_state(page, NR_FILE_PAGES, -nr);
if (PageSwapBacked(page)) {
- __mod_node_page_state(page_pgdat(page), NR_SHMEM, -nr);
+ __mod_lruvec_page_state(page, NR_SHMEM, -nr);
if (PageTransHuge(page))
__dec_node_page_state(page, NR_SHMEM_THPS);
} else if (PageTransHuge(page)) {
@@ -802,21 +802,22 @@ int replace_page_cache_page(struct page
new->mapping = mapping;
new->index = offset;
+ mem_cgroup_migrate(old, new);
+
xas_lock_irqsave(&xas, flags);
xas_store(&xas, new);
old->mapping = NULL;
/* hugetlb pages do not participate in page cache accounting. */
if (!PageHuge(old))
- __dec_node_page_state(old, NR_FILE_PAGES);
+ __dec_lruvec_page_state(old, NR_FILE_PAGES);
if (!PageHuge(new))
- __inc_node_page_state(new, NR_FILE_PAGES);
+ __inc_lruvec_page_state(new, NR_FILE_PAGES);
if (PageSwapBacked(old))
- __dec_node_page_state(old, NR_SHMEM);
+ __dec_lruvec_page_state(old, NR_SHMEM);
if (PageSwapBacked(new))
- __inc_node_page_state(new, NR_SHMEM);
+ __inc_lruvec_page_state(new, NR_SHMEM);
xas_unlock_irqrestore(&xas, flags);
- mem_cgroup_migrate(old, new);
if (freepage)
freepage(old);
put_page(old);
@@ -867,7 +868,7 @@ static int __add_to_page_cache_locked(st
/* hugetlb pages do not participate in page cache accounting */
if (!huge)
- __inc_node_page_state(page, NR_FILE_PAGES);
+ __inc_lruvec_page_state(page, NR_FILE_PAGES);
unlock:
xas_unlock_irq(&xas);
} while (xas_nomem(&xas, gfp_mask & GFP_RECLAIM_MASK));
--- a/mm/khugepaged.c~mm-memcontrol-switch-to-native-nr_file_pages-and-nr_shmem-counters
+++ a/mm/khugepaged.c
@@ -1740,12 +1740,18 @@ out_unlock:
}
if (nr_none) {
- struct zone *zone = page_zone(new_page);
-
- __mod_node_page_state(zone->zone_pgdat, NR_FILE_PAGES, nr_none);
+ struct lruvec *lruvec;
+ /*
+ * XXX: We have started try_charge and pinned the
+ * memcg, but the page isn't committed yet so we
+ * cannot use mod_lruvec_page_state(). This hackery
+ * will be cleaned up when remove the page->mapping
+ * dependency from memcg and fully charge above.
+ */
+ lruvec = mem_cgroup_lruvec(memcg, page_pgdat(new_page));
+ __mod_lruvec_state(lruvec, NR_FILE_PAGES, nr_none);
if (is_shmem)
- __mod_node_page_state(zone->zone_pgdat,
- NR_SHMEM, nr_none);
+ __mod_lruvec_state(lruvec, NR_SHMEM, nr_none);
}
xa_locked:
--- a/mm/memcontrol.c~mm-memcontrol-switch-to-native-nr_file_pages-and-nr_shmem-counters
+++ a/mm/memcontrol.c
@@ -842,11 +842,6 @@ static void mem_cgroup_charge_statistics
*/
if (PageAnon(page))
__mod_memcg_state(memcg, MEMCG_RSS, nr_pages);
- else {
- __mod_memcg_state(memcg, MEMCG_CACHE, nr_pages);
- if (PageSwapBacked(page))
- __mod_memcg_state(memcg, NR_SHMEM, nr_pages);
- }
if (abs(nr_pages) > 1) {
VM_BUG_ON_PAGE(!PageTransHuge(page), page);
@@ -1392,7 +1387,7 @@ static char *memory_stat_format(struct m
(u64)memcg_page_state(memcg, MEMCG_RSS) *
PAGE_SIZE);
seq_buf_printf(&s, "file %llu\n",
- (u64)memcg_page_state(memcg, MEMCG_CACHE) *
+ (u64)memcg_page_state(memcg, NR_FILE_PAGES) *
PAGE_SIZE);
seq_buf_printf(&s, "kernel_stack %llu\n",
(u64)memcg_page_state(memcg, MEMCG_KERNEL_STACK_KB) *
@@ -3304,7 +3299,7 @@ static unsigned long mem_cgroup_usage(st
unsigned long val;
if (mem_cgroup_is_root(memcg)) {
- val = memcg_page_state(memcg, MEMCG_CACHE) +
+ val = memcg_page_state(memcg, NR_FILE_PAGES) +
memcg_page_state(memcg, MEMCG_RSS);
if (swap)
val += memcg_page_state(memcg, MEMCG_SWAP);
@@ -3775,7 +3770,7 @@ static int memcg_numa_stat_show(struct s
#endif /* CONFIG_NUMA */
static const unsigned int memcg1_stats[] = {
- MEMCG_CACHE,
+ NR_FILE_PAGES,
MEMCG_RSS,
MEMCG_RSS_HUGE,
NR_SHMEM,
@@ -5407,6 +5402,14 @@ static int mem_cgroup_move_account(struc
lock_page_memcg(page);
if (!PageAnon(page)) {
+ __mod_lruvec_state(from_vec, NR_FILE_PAGES, -nr_pages);
+ __mod_lruvec_state(to_vec, NR_FILE_PAGES, nr_pages);
+
+ if (PageSwapBacked(page)) {
+ __mod_lruvec_state(from_vec, NR_SHMEM, -nr_pages);
+ __mod_lruvec_state(to_vec, NR_SHMEM, nr_pages);
+ }
+
if (page_mapped(page)) {
__mod_lruvec_state(from_vec, NR_FILE_MAPPED, -nr_pages);
__mod_lruvec_state(to_vec, NR_FILE_MAPPED, nr_pages);
@@ -6613,10 +6616,8 @@ struct uncharge_gather {
unsigned long nr_pages;
unsigned long pgpgout;
unsigned long nr_anon;
- unsigned long nr_file;
unsigned long nr_kmem;
unsigned long nr_huge;
- unsigned long nr_shmem;
struct page *dummy_page;
};
@@ -6640,9 +6641,7 @@ static void uncharge_batch(const struct
local_irq_save(flags);
__mod_memcg_state(ug->memcg, MEMCG_RSS, -ug->nr_anon);
- __mod_memcg_state(ug->memcg, MEMCG_CACHE, -ug->nr_file);
__mod_memcg_state(ug->memcg, MEMCG_RSS_HUGE, -ug->nr_huge);
- __mod_memcg_state(ug->memcg, NR_SHMEM, -ug->nr_shmem);
__count_memcg_events(ug->memcg, PGPGOUT, ug->pgpgout);
__this_cpu_add(ug->memcg->vmstats_percpu->nr_page_events, ug->nr_pages);
memcg_check_events(ug->memcg, ug->dummy_page);
@@ -6683,11 +6682,6 @@ static void uncharge_page(struct page *p
ug->nr_huge += nr_pages;
if (PageAnon(page))
ug->nr_anon += nr_pages;
- else {
- ug->nr_file += nr_pages;
- if (PageSwapBacked(page))
- ug->nr_shmem += nr_pages;
- }
ug->pgpgout++;
} else {
ug->nr_kmem += nr_pages;
--- a/mm/migrate.c~mm-memcontrol-switch-to-native-nr_file_pages-and-nr_shmem-counters
+++ a/mm/migrate.c
@@ -490,11 +490,18 @@ int migrate_page_move_mapping(struct add
* are mapped to swap space.
*/
if (newzone != oldzone) {
- __dec_node_state(oldzone->zone_pgdat, NR_FILE_PAGES);
- __inc_node_state(newzone->zone_pgdat, NR_FILE_PAGES);
+ struct lruvec *old_lruvec, *new_lruvec;
+ struct mem_cgroup *memcg;
+
+ memcg = page_memcg(page);
+ old_lruvec = mem_cgroup_lruvec(memcg, oldzone->zone_pgdat);
+ new_lruvec = mem_cgroup_lruvec(memcg, newzone->zone_pgdat);
+
+ __dec_lruvec_state(old_lruvec, NR_FILE_PAGES);
+ __inc_lruvec_state(new_lruvec, NR_FILE_PAGES);
if (PageSwapBacked(page) && !PageSwapCache(page)) {
- __dec_node_state(oldzone->zone_pgdat, NR_SHMEM);
- __inc_node_state(newzone->zone_pgdat, NR_SHMEM);
+ __dec_lruvec_state(old_lruvec, NR_SHMEM);
+ __inc_lruvec_state(new_lruvec, NR_SHMEM);
}
if (dirty && mapping_cap_account_dirty(mapping)) {
__dec_node_state(oldzone->zone_pgdat, NR_FILE_DIRTY);
--- a/mm/shmem.c~mm-memcontrol-switch-to-native-nr_file_pages-and-nr_shmem-counters
+++ a/mm/shmem.c
@@ -653,8 +653,8 @@ next:
__inc_node_page_state(page, NR_SHMEM_THPS);
}
mapping->nrpages += nr;
- __mod_node_page_state(page_pgdat(page), NR_FILE_PAGES, nr);
- __mod_node_page_state(page_pgdat(page), NR_SHMEM, nr);
+ __mod_lruvec_page_state(page, NR_FILE_PAGES, nr);
+ __mod_lruvec_page_state(page, NR_SHMEM, nr);
unlock:
xas_unlock_irq(&xas);
} while (xas_nomem(&xas, gfp));
@@ -685,8 +685,8 @@ static void shmem_delete_from_page_cache
error = shmem_replace_entry(mapping, page->index, page, radswap);
page->mapping = NULL;
mapping->nrpages--;
- __dec_node_page_state(page, NR_FILE_PAGES);
- __dec_node_page_state(page, NR_SHMEM);
+ __dec_lruvec_page_state(page, NR_FILE_PAGES);
+ __dec_lruvec_page_state(page, NR_SHMEM);
xa_unlock_irq(&mapping->i_pages);
put_page(page);
BUG_ON(error);
@@ -1593,8 +1593,9 @@ static int shmem_replace_page(struct pag
xa_lock_irq(&swap_mapping->i_pages);
error = shmem_replace_entry(swap_mapping, swap_index, oldpage, newpage);
if (!error) {
- __inc_node_page_state(newpage, NR_FILE_PAGES);
- __dec_node_page_state(oldpage, NR_FILE_PAGES);
+ mem_cgroup_migrate(oldpage, newpage);
+ __inc_lruvec_page_state(newpage, NR_FILE_PAGES);
+ __dec_lruvec_page_state(oldpage, NR_FILE_PAGES);
}
xa_unlock_irq(&swap_mapping->i_pages);
@@ -1606,7 +1607,6 @@ static int shmem_replace_page(struct pag
*/
oldpage = newpage;
} else {
- mem_cgroup_migrate(oldpage, newpage);
lru_cache_add_anon(newpage);
*pagep = newpage;
}
_
Patches currently in -mm which might be from hannes@xxxxxxxxxxx are
mm-fix-numa-node-file-count-error-in-replace_page_cache.patch
mm-memcontrol-fix-stat-corrupting-race-in-charge-moving.patch
mm-memcontrol-drop-compound-parameter-from-memcg-charging-api.patch
mm-memcontrol-move-out-cgroup-swaprate-throttling.patch
mm-memcontrol-convert-page-cache-to-a-new-mem_cgroup_charge-api.patch
mm-memcontrol-prepare-uncharging-for-removal-of-private-page-type-counters.patch
mm-memcontrol-prepare-move_account-for-removal-of-private-page-type-counters.patch
mm-memcontrol-prepare-cgroup-vmstat-infrastructure-for-native-anon-counters.patch
mm-memcontrol-switch-to-native-nr_file_pages-and-nr_shmem-counters.patch
mm-memcontrol-switch-to-native-nr_anon_mapped-counter.patch
mm-memcontrol-switch-to-native-nr_anon_thps-counter.patch
mm-memcontrol-convert-anon-and-file-thp-to-new-mem_cgroup_charge-api.patch
mm-memcontrol-drop-unused-try-commit-cancel-charge-api.patch
mm-memcontrol-prepare-swap-controller-setup-for-integration.patch
mm-memcontrol-make-swap-tracking-an-integral-part-of-memory-control.patch
mm-memcontrol-charge-swapin-pages-on-instantiation.patch
mm-memcontrol-delete-unused-lrucare-handling.patch
mm-memcontrol-update-page-mem_cgroup-stability-rules.patch
