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mm: memcg: put cgroup v1-specific code under a config option

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Put legacy cgroup v1 memory controller code under a new CONFIG_MEMCG_V1
config option.  The option is turned off by default.  Nobody except those
who are still using cgroup v1 should turn it on.

If the option is not set, memory controller can still be mounted under
cgroup v1, but none of memcg-specific control files are present.

Please note, that not all cgroup v1's memory controller code is guarded
yet (but most of it), it's a subject for some follow-up work.

Thanks to Michal Hocko for providing a better Kconfig option description.

[roman.gushchin@linux.dev: better config option description provided by Michal]
  Link: https://lkml.kernel.org/r/ZnxXNtvqllc9CDoo@google.com
Link: https://lkml.kernel.org/r/20240625005906.106920-14-roman.gushchin@linux.dev
Signed-off-by: Roman Gushchin <roman.gushchin@linux.dev>
Acked-by: Michal Hocko <mhocko@suse.com>
Acked-by: Shakeel Butt <shakeel.butt@linux.dev>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Muchun Song <muchun.song@linux.dev>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Roman Gushchin 2024-06-24 17:59:05 -07:00 committed by Andrew Morton
parent 6f1173d684
commit e93d4166b4
5 changed files with 49 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
include/linux/memcontrol.h
View File

@ -1851,7 +1851,7 @@ static inline bool mem_cgroup_zswap_writeback_enabled(struct mem_cgroup *memcg)
/* Cgroup v1-related declarations */
#ifdef CONFIG_MEMCG
#ifdef CONFIG_MEMCG_V1
unsigned long memcg1_soft_limit_reclaim(pg_data_t *pgdat, int order,
gfp_t gfp_mask,
unsigned long *total_scanned);
@ -1883,7 +1883,7 @@ static inline void mem_cgroup_unlock_pages(void)
rcu_read_unlock();
}
#else /* CONFIG_MEMCG */
#else /* CONFIG_MEMCG_V1 */
static inline
unsigned long memcg1_soft_limit_reclaim(pg_data_t *pgdat, int order,
gfp_t gfp_mask,
@ -1922,6 +1922,6 @@ static inline bool mem_cgroup_oom_synchronize(bool wait)
return false;
}
#endif /* CONFIG_MEMCG */
#endif /* CONFIG_MEMCG_V1 */
#endif /* _LINUX_MEMCONTROL_H */

17
init/Kconfig
View File

@ -969,6 +969,23 @@ config MEMCG
help
Provides control over the memory footprint of tasks in a cgroup.
config MEMCG_V1
bool "Legacy cgroup v1 memory controller"
depends on MEMCG
default n
help
Legacy cgroup v1 memory controller which has been deprecated by
cgroup v2 implementation. The v1 is there for legacy applications
which haven't migrated to the new cgroup v2 interface yet. If you
do not have any such application then you are completely fine leaving
this option disabled.
Please note that feature set of the legacy memory controller is likely
going to shrink due to deprecation process. New deployments with v1
controller are highly discouraged.
San N is unsure.
config MEMCG_KMEM
bool
depends on MEMCG

3
mm/Makefile
View File

@ -96,7 +96,8 @@ obj-$(CONFIG_NUMA) += memory-tiers.o
obj-$(CONFIG_DEVICE_MIGRATION) += migrate_device.o
obj-$(CONFIG_TRANSPARENT_HUGEPAGE) += huge_memory.o khugepaged.o
obj-$(CONFIG_PAGE_COUNTER) += page_counter.o
obj-$(CONFIG_MEMCG) += memcontrol.o memcontrol-v1.o vmpressure.o
obj-$(CONFIG_MEMCG_V1) += memcontrol-v1.o
obj-$(CONFIG_MEMCG) += memcontrol.o vmpressure.o
ifdef CONFIG_SWAP
obj-$(CONFIG_MEMCG) += swap_cgroup.o
endif

21
mm/memcontrol-v1.h
View File

@ -70,7 +70,7 @@ unsigned long memcg_page_state_local_output(struct mem_cgroup *memcg, int item);
int memory_stat_show(struct seq_file *m, void *v);
/* Cgroup v1-specific declarations */
#ifdef CONFIG_MEMCG_V1
void memcg1_remove_from_trees(struct mem_cgroup *memcg);
static inline void memcg1_soft_limit_reset(struct mem_cgroup *memcg)
@ -105,4 +105,23 @@ void memcg1_stat_format(struct mem_cgroup *memcg, struct seq_buf *s);
extern struct cftype memsw_files[];
extern struct cftype mem_cgroup_legacy_files[];
#else /* CONFIG_MEMCG_V1 */
static inline void memcg1_remove_from_trees(struct mem_cgroup *memcg) {}
static inline void memcg1_soft_limit_reset(struct mem_cgroup *memcg) {}
static inline bool memcg1_wait_acct_move(struct mem_cgroup *memcg) { return false; }
static inline void memcg1_css_offline(struct mem_cgroup *memcg) {}
static inline bool memcg1_oom_prepare(struct mem_cgroup *memcg, bool *locked) { return true; }
static inline void memcg1_oom_finish(struct mem_cgroup *memcg, bool locked) {}
static inline void memcg1_oom_recover(struct mem_cgroup *memcg) {}
static inline void memcg1_check_events(struct mem_cgroup *memcg, int nid) {}
static inline void memcg1_stat_format(struct mem_cgroup *memcg, struct seq_buf *s) {}
extern struct cftype memsw_files[];
extern struct cftype mem_cgroup_legacy_files[];
#endif /* CONFIG_MEMCG_V1 */
#endif /* __MM_MEMCONTROL_V1_H */

10
mm/memcontrol.c
View File

@ -4398,18 +4398,20 @@ struct cgroup_subsys memory_cgrp_subsys = {
.css_free = mem_cgroup_css_free,
.css_reset = mem_cgroup_css_reset,
.css_rstat_flush = mem_cgroup_css_rstat_flush,
.can_attach = memcg1_can_attach,
#if defined(CONFIG_LRU_GEN) || defined(CONFIG_MEMCG_KMEM)
.attach = mem_cgroup_attach,
#endif
.cancel_attach = memcg1_cancel_attach,
.post_attach = memcg1_move_task,
#ifdef CONFIG_MEMCG_KMEM
.fork = mem_cgroup_fork,
.exit = mem_cgroup_exit,
#endif
.dfl_cftypes = memory_files,
#ifdef CONFIG_MEMCG_V1
.can_attach = memcg1_can_attach,
.cancel_attach = memcg1_cancel_attach,
.post_attach = memcg1_move_task,
.legacy_cftypes = mem_cgroup_legacy_files,
#endif
.early_init = 0,
};
@ -5581,7 +5583,9 @@ static int __init mem_cgroup_swap_init(void)
return 0;
WARN_ON(cgroup_add_dfl_cftypes(&memory_cgrp_subsys, swap_files));
#ifdef CONFIG_MEMCG_V1
WARN_ON(cgroup_add_legacy_cftypes(&memory_cgrp_subsys, memsw_files));
#endif
#if defined(CONFIG_MEMCG_KMEM) && defined(CONFIG_ZSWAP)
WARN_ON(cgroup_add_dfl_cftypes(&memory_cgrp_subsys, zswap_files));
#endif