The patch titled
Subject: mm: kmem: switch to static_branch_likely() in memcg_kmem_enabled()
has been removed from the -mm tree. Its filename was
mm-kmem-switch-to-static_branch_likely-in-memcg_kmem_enabled.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
From: Roman Gushchin <guro@xxxxxx>
Subject: mm: kmem: switch to static_branch_likely() in memcg_kmem_enabled()
Currently memcg_kmem_enabled() is optimized for the kernel memory
accounting being off. It was so for a long time, and arguably the reason
behind was that the kernel memory accounting was initially an opt-in
feature. However, now it's on by default on both cgroup v1 and cgroup v2,
and it's on for all cgroups. So let's switch over to
static_branch_likely() to reflect this fact.
Unlikely there is a significant performance difference, as the cost of a
memory allocation and its accounting significantly exceeds the cost of a
jump. However, the conversion makes the code look more logically.
Link: http://lkml.kernel.org/r/20200707173612.124425-3-guro@xxxxxx
Signed-off-by: Roman Gushchin <guro@xxxxxx>
Reviewed-by: Shakeel Butt <shakeelb@xxxxxxxxxx>
Acked-by: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxxxx>
Cc: Christoph Lameter <cl@xxxxxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>
Cc: Pekka Enberg <penberg@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/memcontrol.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/include/linux/memcontrol.h~mm-kmem-switch-to-static_branch_likely-in-memcg_kmem_enabled
+++ a/include/linux/memcontrol.h
@@ -1448,7 +1448,7 @@ void memcg_put_cache_ids(void);
static inline bool memcg_kmem_enabled(void)
{
- return static_branch_unlikely(&memcg_kmem_enabled_key);
+ return static_branch_likely(&memcg_kmem_enabled_key);
}
static inline bool memcg_kmem_bypass(void)
_
Patches currently in -mm which might be from guro@xxxxxx are
percpu-return-number-of-released-bytes-from-pcpu_free_area.patch
mm-memcg-percpu-account-percpu-memory-to-memory-cgroups.patch
mm-memcg-percpu-per-memcg-percpu-memory-statistics.patch
mm-memcg-percpu-per-memcg-percpu-memory-statistics-v3.patch
mm-memcg-charge-memcg-percpu-memory-to-the-parent-cgroup.patch
kselftests-cgroup-add-perpcu-memory-accounting-test.patch
mm-vmstat-fix-proc-sys-vm-stat_refresh-generating-false-warnings.patch
mm-vmstat-fix-proc-sys-vm-stat_refresh-generating-false-warnings-fix.patch
