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Message-ID: <20240509034138.2207186-9-roman.gushchin@linux.dev>
Date: Wed, 8 May 2024 20:41:37 -0700
From: Roman Gushchin <roman.gushchin@...ux.dev>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: Muchun Song <muchun.song@...ux.dev>,
Johannes Weiner <hannes@...xchg.org>,
Michal Hocko <mhocko@...nel.org>,
Shakeel Butt <shakeel.butt@...ux.dev>,
Matthew Wilcox <willy@...radead.org>,
linux-mm@...ck.org,
linux-kernel@...r.kernel.org,
Roman Gushchin <roman.gushchin@...ux.dev>
Subject: [PATCH rfc 8/9] mm: memcg: put corresponding struct mem_cgroup members under CONFIG_MEMCG_V1
Put members of struct mem_cgroup which are related to the legacy
cgroup v1 memory controller under the CONFIG_MEMCG_V1 config option.
Also, put the initialization and some trivial access code under the
same option.
Signed-off-by: Roman Gushchin <roman.gushchin@...ux.dev>
---
include/linux/memcontrol.h | 33 ++++++++++++++++++++-------------
mm/memcontrol.c | 25 +++++++++++++++++++------
2 files changed, 39 insertions(+), 19 deletions(-)
diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index d2a4145b1909..4347d6889fa0 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -182,9 +182,11 @@ struct mem_cgroup {
struct page_counter memsw; /* v1 only */
};
+#ifdef CONFIG_MEMCG_V1
/* Legacy consumer-oriented counters */
struct page_counter kmem; /* v1 only */
struct page_counter tcpmem; /* v1 only */
+#endif
/* Range enforcement for interrupt charges */
struct work_struct high_work;
@@ -198,24 +200,15 @@ struct mem_cgroup {
*/
bool zswap_writeback;
#endif
-
- unsigned long soft_limit;
-
- /* vmpressure notifications */
- struct vmpressure vmpressure;
+ int swappiness;
/*
* Should the OOM killer kill all belonging tasks, had it kill one?
*/
bool oom_group;
- /* protected by memcg_oom_lock */
- bool oom_lock;
- int under_oom;
-
- int swappiness;
- /* OOM-Killer disable */
- int oom_kill_disable;
+ /* vmpressure notifications */
+ struct vmpressure vmpressure;
/* memory.events and memory.events.local */
struct cgroup_file events_file;
@@ -224,6 +217,16 @@ struct mem_cgroup {
/* handle for "memory.swap.events" */
struct cgroup_file swap_events_file;
+#ifdef CONFIG_MEMCG_V1
+ unsigned long soft_limit;
+
+ /* protected by memcg_oom_lock */
+ bool oom_lock;
+ int under_oom;
+
+ /* OOM-Killer disable */
+ int oom_kill_disable;
+
/* protect arrays of thresholds */
struct mutex thresholds_lock;
@@ -244,6 +247,7 @@ struct mem_cgroup {
/* taken only while moving_account > 0 */
spinlock_t move_lock;
unsigned long move_lock_flags;
+#endif
CACHELINE_PADDING(_pad1_);
@@ -279,12 +283,13 @@ struct mem_cgroup {
#endif
CACHELINE_PADDING(_pad2_);
-
+#ifdef CONFIG_MEMCG_V1
/*
* set > 0 if pages under this cgroup are moving to other cgroup.
*/
atomic_t moving_account;
struct task_struct *move_lock_task;
+#endif
struct memcg_vmstats_percpu __percpu *vmstats_percpu;
@@ -294,9 +299,11 @@ struct mem_cgroup {
struct memcg_cgwb_frn cgwb_frn[MEMCG_CGWB_FRN_CNT];
#endif
+#ifdef CONFIG_MEMCG_V1
/* List of events which userspace want to receive */
struct list_head event_list;
spinlock_t event_list_lock;
+#endif
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
struct deferred_split deferred_split_queue;
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index d5883f748330..4dcfd1ef5d61 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -1537,6 +1537,7 @@ void mem_cgroup_print_oom_meminfo(struct mem_cgroup *memcg)
pr_info("swap: usage %llukB, limit %llukB, failcnt %lu\n",
K((u64)page_counter_read(&memcg->swap)),
K((u64)READ_ONCE(memcg->swap.max)), memcg->swap.failcnt);
+#ifdef CONFIG_MEMCG_V1
else {
pr_info("memory+swap: usage %llukB, limit %llukB, failcnt %lu\n",
K((u64)page_counter_read(&memcg->memsw)),
@@ -1545,6 +1546,7 @@ void mem_cgroup_print_oom_meminfo(struct mem_cgroup *memcg)
K((u64)page_counter_read(&memcg->kmem)),
K((u64)memcg->kmem.max), memcg->kmem.failcnt);
}
+#endif
pr_info("Memory cgroup stats for ");
pr_cont_cgroup_path(memcg->css.cgroup);
@@ -2650,12 +2652,14 @@ struct obj_cgroup *get_obj_cgroup_from_folio(struct folio *folio)
static void memcg_account_kmem(struct mem_cgroup *memcg, int nr_pages)
{
mod_memcg_state(memcg, MEMCG_KMEM, nr_pages);
+#ifdef CONFIG_MEMCG_V1
if (!cgroup_subsys_on_dfl(memory_cgrp_subsys)) {
if (nr_pages > 0)
page_counter_charge(&memcg->kmem, nr_pages);
else
page_counter_uncharge(&memcg->kmem, -nr_pages);
}
+#endif
}
@@ -3602,12 +3606,14 @@ static struct mem_cgroup *mem_cgroup_alloc(struct mem_cgroup *parent)
goto fail;
INIT_WORK(&memcg->high_work, high_work_func);
+#ifdef CONFIG_MEMCG_V1
INIT_LIST_HEAD(&memcg->oom_notify);
mutex_init(&memcg->thresholds_lock);
spin_lock_init(&memcg->move_lock);
- vmpressure_init(&memcg->vmpressure);
INIT_LIST_HEAD(&memcg->event_list);
spin_lock_init(&memcg->event_list_lock);
+#endif
+ vmpressure_init(&memcg->vmpressure);
memcg->socket_pressure = jiffies;
#ifdef CONFIG_MEMCG_KMEM
memcg->kmemcg_id = -1;
@@ -3654,20 +3660,22 @@ mem_cgroup_css_alloc(struct cgroup_subsys_state *parent_css)
page_counter_set_high(&memcg->swap, PAGE_COUNTER_MAX);
if (parent) {
WRITE_ONCE(memcg->swappiness, mem_cgroup_swappiness(parent));
- WRITE_ONCE(memcg->oom_kill_disable, READ_ONCE(parent->oom_kill_disable));
-
page_counter_init(&memcg->memory, &parent->memory);
page_counter_init(&memcg->swap, &parent->swap);
+#ifdef CONFIG_MEMCG_V1
page_counter_init(&memcg->kmem, &parent->kmem);
page_counter_init(&memcg->tcpmem, &parent->tcpmem);
+ WRITE_ONCE(memcg->oom_kill_disable, READ_ONCE(parent->oom_kill_disable));
+#endif
} else {
init_memcg_stats();
init_memcg_events();
page_counter_init(&memcg->memory, NULL);
page_counter_init(&memcg->swap, NULL);
+#ifdef CONFIG_MEMCG_V1
page_counter_init(&memcg->kmem, NULL);
page_counter_init(&memcg->tcpmem, NULL);
-
+#endif
root_mem_cgroup = memcg;
return &memcg->css;
}
@@ -3802,12 +3810,14 @@ static void mem_cgroup_css_reset(struct cgroup_subsys_state *css)
page_counter_set_max(&memcg->memory, PAGE_COUNTER_MAX);
page_counter_set_max(&memcg->swap, PAGE_COUNTER_MAX);
+#ifdef CONFIG_MEMCG_V1
page_counter_set_max(&memcg->kmem, PAGE_COUNTER_MAX);
page_counter_set_max(&memcg->tcpmem, PAGE_COUNTER_MAX);
+ mem_cgroup_soft_limit_reset(memcg);
+#endif
page_counter_set_min(&memcg->memory, 0);
page_counter_set_low(&memcg->memory, 0);
page_counter_set_high(&memcg->memory, PAGE_COUNTER_MAX);
- mem_cgroup_soft_limit_reset(memcg);
page_counter_set_high(&memcg->swap, PAGE_COUNTER_MAX);
memcg_wb_domain_size_changed(memcg);
}
@@ -5018,6 +5028,7 @@ void mem_cgroup_sk_free(struct sock *sk)
bool mem_cgroup_charge_skmem(struct mem_cgroup *memcg, unsigned int nr_pages,
gfp_t gfp_mask)
{
+#ifdef CONFIG_MEMCG_V1
if (!cgroup_subsys_on_dfl(memory_cgrp_subsys)) {
struct page_counter *fail;
@@ -5032,6 +5043,7 @@ bool mem_cgroup_charge_skmem(struct mem_cgroup *memcg, unsigned int nr_pages,
}
return false;
}
+#endif
if (try_charge(memcg, gfp_mask, nr_pages) == 0) {
mod_memcg_state(memcg, MEMCG_SOCK, nr_pages);
@@ -5048,11 +5060,12 @@ bool mem_cgroup_charge_skmem(struct mem_cgroup *memcg, unsigned int nr_pages,
*/
void mem_cgroup_uncharge_skmem(struct mem_cgroup *memcg, unsigned int nr_pages)
{
+#ifdef CONFIG_MEMCG_V1
if (!cgroup_subsys_on_dfl(memory_cgrp_subsys)) {
page_counter_uncharge(&memcg->tcpmem, nr_pages);
return;
}
-
+#endif
mod_memcg_state(memcg, MEMCG_SOCK, -nr_pages);
refill_stock(memcg, nr_pages);
--
2.43.2
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