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[062/200] mm: memcg: fix obsolete code comments

Message ID 20201215030645.8_J1qVjuV%akpm@linux-foundation.org (mailing list archive)
State New, archived
Headers show
Series [001/200] kthread: add kthread_work tracepoints | expand

Commit Message

Andrew Morton Dec. 15, 2020, 3:06 a.m. UTC
From: Roman Gushchin <guro@fb.com>
Subject: mm: memcg: fix obsolete code comments

This patch fixes/removes some obsolete comments in the code related
to the kernel memory accounting:
- kmem_cache->memcg_params.memcg_caches has been removed
  by commit 9855609bde03 ("mm: memcg/slab: use a single set of
  kmem_caches for all accounted allocations")
- memcg->kmemcg_id is not used as a gate for kmem accounting since
  commit 0b8f73e10428 ("mm: memcontrol: clean up alloc, online,
  offline, free functions")

Link: https://lkml.kernel.org/r/20201110184615.311974-1-guro@fb.com
Signed-off-by: Roman Gushchin <guro@fb.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Reviewed-by: Shakeel Butt <shakeelb@google.com>
Cc: Michal Hocko <mhocko@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 include/linux/memcontrol.h |    6 ++----
 mm/memcontrol.c            |    6 ------
 2 files changed, 2 insertions(+), 10 deletions(-)
diff mbox series

Patch

--- a/include/linux/memcontrol.h~mm-memcg-fix-obsolete-code-comments
+++ a/include/linux/memcontrol.h
@@ -296,7 +296,6 @@  struct mem_cgroup {
 	int			tcpmem_pressure;
 
 #ifdef CONFIG_MEMCG_KMEM
-        /* Index in the kmem_cache->memcg_params.memcg_caches array */
 	int kmemcg_id;
 	enum memcg_kmem_state kmem_state;
 	struct obj_cgroup __rcu *objcg;
@@ -1562,9 +1561,8 @@  static inline void memcg_kmem_uncharge(s
 }
 
 /*
- * helper for accessing a memcg's index. It will be used as an index in the
- * child cache array in kmem_cache, and also to derive its name. This function
- * will return -1 when this is not a kmem-limited memcg.
+ * A helper for accessing memcg's kmem_id, used for getting
+ * corresponding LRU lists.
  */
 static inline int memcg_cache_id(struct mem_cgroup *memcg)
 {
--- a/mm/memcontrol.c~mm-memcg-fix-obsolete-code-comments
+++ a/mm/memcontrol.c
@@ -3703,12 +3703,6 @@  static int memcg_online_kmem(struct mem_
 
 	static_branch_enable(&memcg_kmem_enabled_key);
 
-	/*
-	 * A memory cgroup is considered kmem-online as soon as it gets
-	 * kmemcg_id. Setting the id after enabling static branching will
-	 * guarantee no one starts accounting before all call sites are
-	 * patched.
-	 */
 	memcg->kmemcg_id = memcg_id;
 	memcg->kmem_state = KMEM_ONLINE;