The patch titled
Subject: mm: memcontrol: allow to disable kmem accounting for cgroup2
has been added to the -mm tree. Its filename is
mm-memcontrol-allow-to-disable-kmem-accounting-for-cgroup2.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-memcontrol-allow-to-disable-kmem-accounting-for-cgroup2.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-memcontrol-allow-to-disable-kmem-accounting-for-cgroup2.patch
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*** Remember to use Documentation/SubmitChecklist when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: Vladimir Davydov <vdavydov@xxxxxxxxxxxxx>
Subject: mm: memcontrol: allow to disable kmem accounting for cgroup2
Kmem accounting might incur overhead that some users can't put up with.
Besides, the implementation is still considered unstable. So let's
provide a way to disable it for those users who aren't happy with it.
To disable kmem accounting for cgroup2, pass cgroup.memory=nokmem at
boot time.
Signed-off-by: Vladimir Davydov <vdavydov@xxxxxxxxxxxxx>
Acked-by: Johannes Weiner <hannes@xxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
Documentation/kernel-parameters.txt | 1 +
mm/memcontrol.c | 9 +++++++--
2 files changed, 8 insertions(+), 2 deletions(-)
diff -puN Documentation/kernel-parameters.txt~mm-memcontrol-allow-to-disable-kmem-accounting-for-cgroup2 Documentation/kernel-parameters.txt
--- a/Documentation/kernel-parameters.txt~mm-memcontrol-allow-to-disable-kmem-accounting-for-cgroup2
+++ a/Documentation/kernel-parameters.txt
@@ -602,6 +602,7 @@ bytes respectively. Such letter suffixes
cgroup.memory= [KNL] Pass options to the cgroup memory controller.
Format: <string>
nosocket -- Disable socket memory accounting.
+ nokmem -- Disable kernel memory accounting.
checkreqprot [SELINUX] Set initial checkreqprot flag value.
Format: { "0" | "1" }
diff -puN mm/memcontrol.c~mm-memcontrol-allow-to-disable-kmem-accounting-for-cgroup2 mm/memcontrol.c
--- a/mm/memcontrol.c~mm-memcontrol-allow-to-disable-kmem-accounting-for-cgroup2
+++ a/mm/memcontrol.c
@@ -83,6 +83,9 @@ struct mem_cgroup *root_mem_cgroup __rea
/* Socket memory accounting disabled? */
static bool cgroup_memory_nosocket;
+/* Kernel memory accounting disabled? */
+static bool cgroup_memory_nokmem;
+
/* Whether the swap controller is active */
#ifdef CONFIG_MEMCG_SWAP
int do_swap_account __read_mostly;
@@ -2898,8 +2901,8 @@ static int memcg_propagate_kmem(struct m
* onlined after this point, because it has at least one child
* already.
*/
- if (cgroup_subsys_on_dfl(memory_cgrp_subsys) ||
- memcg_kmem_online(parent))
+ if (memcg_kmem_online(parent) ||
+ (cgroup_subsys_on_dfl(memory_cgrp_subsys) && !cgroup_memory_nokmem))
ret = memcg_online_kmem(memcg);
mutex_unlock(&memcg_limit_mutex);
return ret;
@@ -5587,6 +5590,8 @@ static int __init cgroup_memory(char *s)
continue;
if (!strcmp(token, "nosocket"))
cgroup_memory_nosocket = true;
+ if (!strcmp(token, "nokmem"))
+ cgroup_memory_nokmem = true;
}
return 0;
}
_
Patches currently in -mm which might be from vdavydov@xxxxxxxxxxxxx are
memcg-fix-memoryhigh-target.patch
revert-kernfs-do-not-account-ino_ida-allocations-to-memcg.patch
revert-gfp-add-__gfp_noaccount.patch
memcg-only-account-kmem-allocations-marked-as-__gfp_account.patch
slab-add-slab_account-flag.patch
vmalloc-allow-to-account-vmalloc-to-memcg.patch
account-certain-kmem-allocations-to-memcg.patch
vmscan-do-not-force-scan-file-lru-if-its-absolute-size-is-small.patch
vmscan-do-not-force-scan-file-lru-if-its-absolute-size-is-small-v2.patch
memcg-do-not-allow-to-disable-tcp-accounting-after-limit-is-set.patch
mm-add-page_check_address_transhuge-helper.patch
mm-add-page_check_address_transhuge-helper-fix.patch
mm-memcontrol-allow-to-disable-kmem-accounting-for-cgroup2.patch
net-drop-tcp_memcontrolc.patch
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