The patch titled
Subject: mm: memcontrol: use mem_cgroup_is_root() helper
has been added to the -mm mm-unstable branch. Its filename is
mm-memcontrol-use-mem_cgroup_is_root-helper.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-memcontrol-use-mem_cgroup_is_root-helper.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Kamalesh Babulal <kamalesh.babulal@xxxxxxxxxx>
Subject: mm: memcontrol: use mem_cgroup_is_root() helper
Date: Fri, 30 Sep 2022 19:14:33 +0530
Replace the checks for memcg is root memcg, with mem_cgroup_is_root()
helper.
Link: https://lkml.kernel.org/r/20220930134433.338103-1-kamalesh.babulal@xxxxxxxxxx
Signed-off-by: Kamalesh Babulal <kamalesh.babulal@xxxxxxxxxx>
Reviewed-by: Muchun Song <songmuchun@xxxxxxxxxxxxx>
Acked-by: Michal Hocko <mhocko@xxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Kamalesh Babulal <kamalesh.babulal@xxxxxxxxxx>
Cc: Roman Gushchin <roman.gushchin@xxxxxxxxx>
Cc: Shakeel Butt <shakeelb@xxxxxxxxxx>
Cc: Tom Hromatka <tom.hromatka@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/memcontrol.c | 20 ++++++++++----------
1 file changed, 10 insertions(+), 10 deletions(-)
--- a/mm/memcontrol.c~mm-memcontrol-use-mem_cgroup_is_root-helper
+++ a/mm/memcontrol.c
@@ -1219,7 +1219,7 @@ static void invalidate_reclaim_iterators
* cgroup root (root_mem_cgroup). So we have to handle
* dead_memcg from cgroup root separately.
*/
- if (last != root_mem_cgroup)
+ if (!mem_cgroup_is_root(last))
__invalidate_reclaim_iterators(root_mem_cgroup,
dead_memcg);
}
@@ -1243,7 +1243,7 @@ int mem_cgroup_scan_tasks(struct mem_cgr
struct mem_cgroup *iter;
int ret = 0;
- BUG_ON(memcg == root_mem_cgroup);
+ BUG_ON(mem_cgroup_is_root(memcg));
for_each_mem_cgroup_tree(iter, memcg) {
struct css_task_iter it;
@@ -1272,7 +1272,7 @@ void lruvec_memcg_debug(struct lruvec *l
memcg = folio_memcg(folio);
if (!memcg)
- VM_BUG_ON_FOLIO(lruvec_memcg(lruvec) != root_mem_cgroup, folio);
+ VM_BUG_ON_FOLIO(!mem_cgroup_is_root(lruvec_memcg(lruvec)), folio);
else
VM_BUG_ON_FOLIO(lruvec_memcg(lruvec) != memcg, folio);
}
@@ -2036,7 +2036,7 @@ struct mem_cgroup *mem_cgroup_get_oom_gr
rcu_read_lock();
memcg = mem_cgroup_from_task(victim);
- if (memcg == root_mem_cgroup)
+ if (mem_cgroup_is_root(memcg))
goto out;
/*
@@ -2995,7 +2995,7 @@ static struct obj_cgroup *__get_obj_cgro
{
struct obj_cgroup *objcg = NULL;
- for (; memcg != root_mem_cgroup; memcg = parent_mem_cgroup(memcg)) {
+ for (; !mem_cgroup_is_root(memcg); memcg = parent_mem_cgroup(memcg)) {
objcg = rcu_dereference(memcg->objcg);
if (objcg && obj_cgroup_tryget(objcg))
break;
@@ -7163,7 +7163,7 @@ void mem_cgroup_sk_alloc(struct sock *sk
rcu_read_lock();
memcg = mem_cgroup_from_task(current);
- if (memcg == root_mem_cgroup)
+ if (mem_cgroup_is_root(memcg))
goto out;
if (!cgroup_subsys_on_dfl(memory_cgrp_subsys) && !memcg->tcpmem_active)
goto out;
@@ -7298,7 +7298,7 @@ static struct mem_cgroup *mem_cgroup_id_
* The root cgroup cannot be destroyed, so it's refcount must
* always be >= 1.
*/
- if (WARN_ON_ONCE(memcg == root_mem_cgroup)) {
+ if (WARN_ON_ONCE(mem_cgroup_is_root(memcg))) {
VM_BUG_ON(1);
break;
}
@@ -7462,7 +7462,7 @@ long mem_cgroup_get_nr_swap_pages(struct
if (mem_cgroup_disabled() || do_memsw_account())
return nr_swap_pages;
- for (; memcg != root_mem_cgroup; memcg = parent_mem_cgroup(memcg))
+ for (; !mem_cgroup_is_root(memcg); memcg = parent_mem_cgroup(memcg))
nr_swap_pages = min_t(long, nr_swap_pages,
READ_ONCE(memcg->swap.max) -
page_counter_read(&memcg->swap));
@@ -7484,7 +7484,7 @@ bool mem_cgroup_swap_full(struct folio *
if (!memcg)
return false;
- for (; memcg != root_mem_cgroup; memcg = parent_mem_cgroup(memcg)) {
+ for (; !mem_cgroup_is_root(memcg); memcg = parent_mem_cgroup(memcg)) {
unsigned long usage = page_counter_read(&memcg->swap);
if (usage * 2 >= READ_ONCE(memcg->swap.high) ||
@@ -7648,7 +7648,7 @@ bool obj_cgroup_may_zswap(struct obj_cgr
return true;
original_memcg = get_mem_cgroup_from_objcg(objcg);
- for (memcg = original_memcg; memcg != root_mem_cgroup;
+ for (memcg = original_memcg; !mem_cgroup_is_root(memcg);
memcg = parent_mem_cgroup(memcg)) {
unsigned long max = READ_ONCE(memcg->zswap_max);
unsigned long pages;
_
Patches currently in -mm which might be from kamalesh.babulal@xxxxxxxxxx are
mm-memcontrol-use-mem_cgroup_is_root-helper.patch
