The quilt patch titled
Subject: memcontrol: implement mem_cgroup_tryget_online()
has been removed from the -mm tree. Its filename was
memcontrol-implement-mem_cgroup_tryget_online.patch
This patch was dropped because it was merged into the mm-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
------------------------------------------------------
From: Nhat Pham <nphamcs@xxxxxxxxx>
Subject: memcontrol: implement mem_cgroup_tryget_online()
Date: Thu, 30 Nov 2023 11:40:19 -0800
This patch implements a helper function that try to get a reference to an
memcg's css, as well as checking if it is online. This new function is
almost exactly the same as the existing mem_cgroup_tryget(), except for
the onlineness check. In the !CONFIG_MEMCG case, it always returns true,
analogous to mem_cgroup_tryget(). This is useful for e.g to the new zswap
writeback scheme, where we need to select the next online memcg as a
candidate for the global limit reclaim.
Link: https://lkml.kernel.org/r/20231130194023.4102148-3-nphamcs@xxxxxxxxx
Signed-off-by: Nhat Pham <nphamcs@xxxxxxxxx>
Tested-by: Bagas Sanjaya <bagasdotme@xxxxxxxxx>
Reviewed-by: Yosry Ahmed <yosryahmed@xxxxxxxxxx>
Cc: Chris Li <chrisl@xxxxxxxxxx>
Cc: Dan Streetman <ddstreet@xxxxxxxx>
Cc: Domenico Cerasuolo <cerasuolodomenico@xxxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxxxx>
Cc: Muchun Song <muchun.song@xxxxxxxxx>
Cc: Roman Gushchin <roman.gushchin@xxxxxxxxx>
Cc: Seth Jennings <sjenning@xxxxxxxxxx>
Cc: Shakeel Butt <shakeelb@xxxxxxxxxx>
Cc: Shuah Khan <shuah@xxxxxxxxxx>
Cc: Vitaly Wool <vitaly.wool@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/memcontrol.h | 10 ++++++++++
1 file changed, 10 insertions(+)
--- a/include/linux/memcontrol.h~memcontrol-implement-mem_cgroup_tryget_online
+++ a/include/linux/memcontrol.h
@@ -821,6 +821,11 @@ static inline bool mem_cgroup_tryget(str
return !memcg || css_tryget(&memcg->css);
}
+static inline bool mem_cgroup_tryget_online(struct mem_cgroup *memcg)
+{
+ return !memcg || css_tryget_online(&memcg->css);
+}
+
static inline void mem_cgroup_put(struct mem_cgroup *memcg)
{
if (memcg)
@@ -1348,6 +1353,11 @@ static inline bool mem_cgroup_tryget(str
{
return true;
}
+
+static inline bool mem_cgroup_tryget_online(struct mem_cgroup *memcg)
+{
+ return true;
+}
static inline void mem_cgroup_put(struct mem_cgroup *memcg)
{
_
Patches currently in -mm which might be from nphamcs@xxxxxxxxx are
zswap-memcontrol-implement-zswap-writeback-disabling.patch
