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mm: memcontrol: prepare move_account for removal of private page type counters

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When memcg uses the generic vmstat counters, it doesn't need to do
anything at charging and uncharging time.  It does, however, need to
migrate counts when pages move to a different cgroup in move_account.

Prepare the move_account function for the arrival of NR_FILE_PAGES,
NR_ANON_MAPPED, NR_ANON_THPS etc.  by having a branch for files and a
branch for anon, which can then divided into sub-branches.

Signed-off-by: Johannes Weiner <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Reviewed-by: Alex Shi <[email protected]>
Reviewed-by: Joonsoo Kim <[email protected]>
Cc: Hugh Dickins <[email protected]>
Cc: "Kirill A. Shutemov" <[email protected]>
Cc: Michal Hocko <[email protected]>
Cc: Roman Gushchin <[email protected]>
Cc: Shakeel Butt <[email protected]>
Cc: Balbir Singh <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Johannes Weiner authored and Linus Torvalds committed 2020-06-03 20:09:47 -07:00
1 parent 9f762dbe19
commit 49e50d277b
1 file changed
+13 -12
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mm/memcontrol.c
+13 -12
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@@ -5434,7 +5434,6 @@ static int mem_cgroup_move_account(struct page *page,
struct pglist_data *pgdat;
unsigned int nr_pages = compound ? hpage_nr_pages(page) : 1;
int ret;
bool anon;
VM_BUG_ON(from == to);
VM_BUG_ON_PAGE(PageLRU(page), page);
@@ -5452,25 +5451,27 @@ static int mem_cgroup_move_account(struct page *page,
if (page->mem_cgroup != from)
goto out_unlock;
anon = PageAnon(page);
pgdat = page_pgdat(page);
from_vec = mem_cgroup_lruvec(from, pgdat);
to_vec = mem_cgroup_lruvec(to, pgdat);
lock_page_memcg(page);
if (!anon && page_mapped(page)) {
__mod_lruvec_state(from_vec, NR_FILE_MAPPED, -nr_pages);
__mod_lruvec_state(to_vec, NR_FILE_MAPPED, nr_pages);
}
if (!PageAnon(page)) {
if (page_mapped(page)) {
__mod_lruvec_state(from_vec, NR_FILE_MAPPED, -nr_pages);
__mod_lruvec_state(to_vec, NR_FILE_MAPPED, nr_pages);
}
if (!anon && PageDirty(page)) {
struct address_space *mapping = page_mapping(page);
if (PageDirty(page)) {
struct address_space *mapping = page_mapping(page);
if (mapping_cap_account_dirty(mapping)) {
__mod_lruvec_state(from_vec, NR_FILE_DIRTY, -nr_pages);
__mod_lruvec_state(to_vec, NR_FILE_DIRTY, nr_pages);
if (mapping_cap_account_dirty(mapping)) {
__mod_lruvec_state(from_vec, NR_FILE_DIRTY,
-nr_pages);
__mod_lruvec_state(to_vec, NR_FILE_DIRTY,
nr_pages);
}
}
}