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authorJohannes Weiner <hannes@cmpxchg.org>2020-06-04 02:01:44 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2020-06-04 06:09:47 +0300
commit9f762dbe19b9f16d5df5603d4b93bad391c302bc (patch)
treeb7281508b14b9b12febeeb674860f13a8b22630e /mm/memcontrol.c
parent3fea5a499d57dec46043fcdb08e38eac1767bb0d (diff)
downloadlinux-9f762dbe19b9f16d5df5603d4b93bad391c302bc.tar.xz
mm: memcontrol: prepare uncharging for removal of private page type counters
The uncharge batching code adds up the anon, file, kmem counts to determine the total number of pages to uncharge and references to drop. But the next patches will remove the anon and file counters. Maintain an aggregate nr_pages in the uncharge_gather struct. Signed-off-by: Johannes Weiner <hannes@cmpxchg.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Reviewed-by: Alex Shi <alex.shi@linux.alibaba.com> Reviewed-by: Joonsoo Kim <iamjoonsoo.kim@lge.com> Cc: Hugh Dickins <hughd@google.com> Cc: "Kirill A. Shutemov" <kirill@shutemov.name> Cc: Michal Hocko <mhocko@suse.com> Cc: Roman Gushchin <guro@fb.com> Cc: Shakeel Butt <shakeelb@google.com> Cc: Balbir Singh <bsingharora@gmail.com> Link: http://lkml.kernel.org/r/20200508183105.225460-7-hannes@cmpxchg.org Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/memcontrol.c')
-rw-r--r--mm/memcontrol.c23
1 files changed, 12 insertions, 11 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index c414b7f85e48..ff45bef46ffe 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -6666,6 +6666,7 @@ int mem_cgroup_charge(struct page *page, struct mm_struct *mm, gfp_t gfp_mask,
struct uncharge_gather {
struct mem_cgroup *memcg;
+ unsigned long nr_pages;
unsigned long pgpgout;
unsigned long nr_anon;
unsigned long nr_file;
@@ -6682,13 +6683,12 @@ static inline void uncharge_gather_clear(struct uncharge_gather *ug)
static void uncharge_batch(const struct uncharge_gather *ug)
{
- unsigned long nr_pages = ug->nr_anon + ug->nr_file + ug->nr_kmem;
unsigned long flags;
if (!mem_cgroup_is_root(ug->memcg)) {
- page_counter_uncharge(&ug->memcg->memory, nr_pages);
+ page_counter_uncharge(&ug->memcg->memory, ug->nr_pages);
if (do_memsw_account())
- page_counter_uncharge(&ug->memcg->memsw, nr_pages);
+ page_counter_uncharge(&ug->memcg->memsw, ug->nr_pages);
if (!cgroup_subsys_on_dfl(memory_cgrp_subsys) && ug->nr_kmem)
page_counter_uncharge(&ug->memcg->kmem, ug->nr_kmem);
memcg_oom_recover(ug->memcg);
@@ -6700,16 +6700,18 @@ static void uncharge_batch(const struct uncharge_gather *ug)
__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, nr_pages);
+ __this_cpu_add(ug->memcg->vmstats_percpu->nr_page_events, ug->nr_pages);
memcg_check_events(ug->memcg, ug->dummy_page);
local_irq_restore(flags);
if (!mem_cgroup_is_root(ug->memcg))
- css_put_many(&ug->memcg->css, nr_pages);
+ css_put_many(&ug->memcg->css, ug->nr_pages);
}
static void uncharge_page(struct page *page, struct uncharge_gather *ug)
{
+ unsigned long nr_pages;
+
VM_BUG_ON_PAGE(PageLRU(page), page);
if (!page->mem_cgroup)
@@ -6729,13 +6731,12 @@ static void uncharge_page(struct page *page, struct uncharge_gather *ug)
ug->memcg = page->mem_cgroup;
}
- if (!PageKmemcg(page)) {
- unsigned int nr_pages = 1;
+ nr_pages = compound_nr(page);
+ ug->nr_pages += nr_pages;
- if (PageTransHuge(page)) {
- nr_pages = compound_nr(page);
+ if (!PageKmemcg(page)) {
+ if (PageTransHuge(page))
ug->nr_huge += nr_pages;
- }
if (PageAnon(page))
ug->nr_anon += nr_pages;
else {
@@ -6745,7 +6746,7 @@ static void uncharge_page(struct page *page, struct uncharge_gather *ug)
}
ug->pgpgout++;
} else {
- ug->nr_kmem += compound_nr(page);
+ ug->nr_kmem += nr_pages;
__ClearPageKmemcg(page);
}