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| author | Vladimir Davydov <vdavydov@virtuozzo.com> | 2016-01-20 15:02:38 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-01-20 17:09:18 -0800 |
| commit | 04823c833b3eaef7816e28e3727124394f6bb3c3 (patch) | |
| tree | 2fd7291cb5605b74a834aa44f91a754ae860238a | |
| parent | 52c29b04823cb1bab2805336b80866325fe2bc3f (diff) | |
| download | nvdimm-04823c833b3eaef7816e28e3727124394f6bb3c3.tar.gz | |
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@virtuozzo.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | Documentation/kernel-parameters.txt | 1 | ||||
| -rw-r--r-- | mm/memcontrol.c | 9 |
2 files changed, 8 insertions, 2 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index 3ea869d7a31c40..cfb2c0f1a4a892 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -611,6 +611,7 @@ bytes respectively. Such letter suffixes can also be entirely omitted. 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 --git a/mm/memcontrol.c b/mm/memcontrol.c index 9e7a4e52191709..2239e6dd4d4c12 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -83,6 +83,9 @@ struct mem_cgroup *root_mem_cgroup __read_mostly; /* 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; @@ -2925,8 +2928,8 @@ static int memcg_propagate_kmem(struct mem_cgroup *memcg) * 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; @@ -5638,6 +5641,8 @@ 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; } |