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authorVladimir Davydov <vdavydov@virtuozzo.com>2016-07-26 15:24:27 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2016-07-26 16:19:19 -0700
commit5e8d35f849b1969b900695ae191326bfacf6bfc6 (patch)
tree44abca20811fc74b8753b3948f10f637af65d1a2 /mm/memcontrol.c
parent4949148ad433f6f11cf837978b2907092ec99f3a (diff)
mm: memcontrol: teach uncharge_list to deal with kmem pages
Page table pages are batched-freed in release_pages on most architectures. If we want to charge them to kmemcg (this is what is done later in this series), we need to teach mem_cgroup_uncharge_list to handle kmem pages. Link: http://lkml.kernel.org/r/18d5c09e97f80074ed25b97a7d0f32b95d875717.1464079538.git.vdavydov@virtuozzo.com Signed-off-by: Vladimir Davydov <vdavydov@virtuozzo.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Michal Hocko <mhocko@kernel.org> Cc: Eric Dumazet <eric.dumazet@gmail.com> Cc: Minchan Kim <minchan@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/memcontrol.c')
-rw-r--r--mm/memcontrol.c42
1 files changed, 24 insertions, 18 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 089ef3614155..ff53e348c4bb 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -5505,15 +5505,18 @@ void mem_cgroup_cancel_charge(struct page *page, struct mem_cgroup *memcg,
static void uncharge_batch(struct mem_cgroup *memcg, unsigned long pgpgout,
unsigned long nr_anon, unsigned long nr_file,
- unsigned long nr_huge, struct page *dummy_page)
+ unsigned long nr_huge, unsigned long nr_kmem,
+ struct page *dummy_page)
{
- unsigned long nr_pages = nr_anon + nr_file;
+ unsigned long nr_pages = nr_anon + nr_file + nr_kmem;
unsigned long flags;
if (!mem_cgroup_is_root(memcg)) {
page_counter_uncharge(&memcg->memory, nr_pages);
if (do_memsw_account())
page_counter_uncharge(&memcg->memsw, nr_pages);
+ if (!cgroup_subsys_on_dfl(memory_cgrp_subsys) && nr_kmem)
+ page_counter_uncharge(&memcg->kmem, nr_kmem);
memcg_oom_recover(memcg);
}
@@ -5536,6 +5539,7 @@ static void uncharge_list(struct list_head *page_list)
unsigned long nr_anon = 0;
unsigned long nr_file = 0;
unsigned long nr_huge = 0;
+ unsigned long nr_kmem = 0;
unsigned long pgpgout = 0;
struct list_head *next;
struct page *page;
@@ -5546,8 +5550,6 @@ static void uncharge_list(struct list_head *page_list)
*/
next = page_list->next;
do {
- unsigned int nr_pages = 1;
-
page = list_entry(next, struct page, lru);
next = page->lru.next;
@@ -5566,31 +5568,35 @@ static void uncharge_list(struct list_head *page_list)
if (memcg != page->mem_cgroup) {
if (memcg) {
uncharge_batch(memcg, pgpgout, nr_anon, nr_file,
- nr_huge, page);
- pgpgout = nr_anon = nr_file = nr_huge = 0;
+ nr_huge, nr_kmem, page);
+ pgpgout = nr_anon = nr_file =
+ nr_huge = nr_kmem = 0;
}
memcg = page->mem_cgroup;
}
- if (PageTransHuge(page)) {
- nr_pages <<= compound_order(page);
- VM_BUG_ON_PAGE(!PageTransHuge(page), page);
- nr_huge += nr_pages;
- }
+ if (!PageKmemcg(page)) {
+ unsigned int nr_pages = 1;
- if (PageAnon(page))
- nr_anon += nr_pages;
- else
- nr_file += nr_pages;
+ if (PageTransHuge(page)) {
+ nr_pages <<= compound_order(page);
+ VM_BUG_ON_PAGE(!PageTransHuge(page), page);
+ nr_huge += nr_pages;
+ }
+ if (PageAnon(page))
+ nr_anon += nr_pages;
+ else
+ nr_file += nr_pages;
+ pgpgout++;
+ } else
+ nr_kmem += 1 << compound_order(page);
page->mem_cgroup = NULL;
-
- pgpgout++;
} while (next != page_list);
if (memcg)
uncharge_batch(memcg, pgpgout, nr_anon, nr_file,
- nr_huge, page);
+ nr_huge, nr_kmem, page);
}
/**