The patch titled
Subject: Documentation/memcg: update memcg/kmem status
has been added to the -mm tree. Its filename is
documentation-memcg-update-memcg-kmem-status.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/documentation-memcg-update-memcg-kmem-status.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/documentation-memcg-update-memcg-kmem-status.patch
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------------------------------------------------------
From: Vladimir Davydov <vdavydov@xxxxxxxxxxxxx>
Subject: Documentation/memcg: update memcg/kmem status
Memcg/kmem reclaim support has been finally merged. Reflect this in the
documentation.
Signed-off-by: Vladimir Davydov <vdavydov@xxxxxxxxxxxxx>
Cc: Jonathan Corbet <corbet@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
Documentation/cgroups/memory.txt | 8 +++-----
init/Kconfig | 6 ------
2 files changed, 3 insertions(+), 11 deletions(-)
diff -puN Documentation/cgroups/memory.txt~documentation-memcg-update-memcg-kmem-status Documentation/cgroups/memory.txt
--- a/Documentation/cgroups/memory.txt~documentation-memcg-update-memcg-kmem-status
+++ a/Documentation/cgroups/memory.txt
@@ -275,11 +275,6 @@ When oom event notifier is registered, e
2.7 Kernel Memory Extension (CONFIG_MEMCG_KMEM)
-WARNING: Current implementation lacks reclaim support. That means allocation
- attempts will fail when close to the limit even if there are plenty of
- kmem available for reclaim. That makes this option unusable in real
- life so DO NOT SELECT IT unless for development purposes.
-
With the Kernel memory extension, the Memory Controller is able to limit
the amount of kernel memory used by the system. Kernel memory is fundamentally
different than user memory, since it can't be swapped out, which makes it
@@ -345,6 +340,9 @@ set:
In this case, the admin could set up K so that the sum of all groups is
never greater than the total memory, and freely set U at the cost of his
QoS.
+ WARNING: In the current implementation, memory reclaim will NOT be
+ triggered for a cgroup when it hits K while staying below U, which makes
+ this setup impractical.
U != 0, K >= U:
Since kmem charges will also be fed to the user counter and reclaim will be
diff -puN init/Kconfig~documentation-memcg-update-memcg-kmem-status init/Kconfig
--- a/init/Kconfig~documentation-memcg-update-memcg-kmem-status
+++ a/init/Kconfig
@@ -1032,12 +1032,6 @@ config MEMCG_KMEM
the kmem extension can use it to guarantee that no group of processes
will ever exhaust kernel resources alone.
- WARNING: Current implementation lacks reclaim support. That means
- allocation attempts will fail when close to the limit even if there
- are plenty of kmem available for reclaim. That makes this option
- unusable in real life so DO NOT SELECT IT unless for development
- purposes.
-
config CGROUP_HUGETLB
bool "HugeTLB Resource Controller for Control Groups"
depends on HUGETLB_PAGE
_
Patches currently in -mm which might be from vdavydov@xxxxxxxxxxxxx are
mm-hotplug-fix-concurrent-memory-hot-add-deadlock.patch
ocfs2-copy-fs-uuid-to-superblock.patch
cleancache-zap-uuid-arg-of-cleancache_init_shared_fs.patch
cleancache-forbid-overriding-cleancache_ops.patch
cleancache-remove-limit-on-the-number-of-cleancache-enabled-filesystems.patch
cleancache-remove-limit-on-the-number-of-cleancache-enabled-filesystems-fix.patch
memcg-zap-mem_cgroup_lookup.patch
memcg-remove-obsolete-comment.patch
documentation-memcg-update-memcg-kmem-status.patch
mm-vmscan-fix-the-page-state-calculation-in-too_many_isolated.patch
signal-remove-warning-about-using-si_tkill-in-rt_sigqueueinfo.patch
linux-next.patch
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