On Wed 01-04-15 17:30:36, Vladimir Davydov wrote: > Memcg/kmem reclaim support has been finally merged. Reflect this in the > documentation. > > Signed-off-by: Vladimir Davydov <vdavydov@xxxxxxxxxxxxx> Acked-by: Michal Hocko <mhocko@xxxxxxx> > --- > Documentation/cgroups/memory.txt | 8 +++----- > init/Kconfig | 6 ------ > 2 files changed, 3 insertions(+), 11 deletions(-) > > diff --git a/Documentation/cgroups/memory.txt b/Documentation/cgroups/memory.txt > index a22df3ad35ff..f456b4315e86 100644 > --- a/Documentation/cgroups/memory.txt > +++ b/Documentation/cgroups/memory.txt > @@ -275,11 +275,6 @@ When oom event notifier is registered, event will be delivered. > > 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 --git a/init/Kconfig b/init/Kconfig > index 7766b500f679..caffca37ccb7 100644 > --- a/init/Kconfig > +++ b/init/Kconfig > @@ -1059,12 +1059,6 @@ 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 > -- > 1.7.10.4 > > -- > To unsubscribe from this list: send the line "unsubscribe cgroups" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- Michal Hocko SUSE Labs -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>