For the root cgroup (the whole system), we already have overcommit accounting and control, so we can skip charging tasks in the root cgroup to avoid overhead.
Signed-off-by: Vladimir Davydov <[email protected]> --- mm/vm_cgroup.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/mm/vm_cgroup.c b/mm/vm_cgroup.c index 6642f934540a..c871fecaab4c 100644 --- a/mm/vm_cgroup.c +++ b/mm/vm_cgroup.c @@ -1,6 +1,7 @@ #include <linux/cgroup.h> #include <linux/res_counter.h> #include <linux/mm.h> +#include <linux/mman.h> #include <linux/slab.h> #include <linux/rcupdate.h> #include <linux/shmem_fs.h> @@ -65,6 +66,9 @@ static int vm_cgroup_do_charge(struct vm_cgroup *vmcg, unsigned long val = nr_pages << PAGE_SHIFT; struct res_counter *fail_res; + if (vm_cgroup_is_root(vmcg)) + return 0; + return res_counter_charge(&vmcg->res, val, &fail_res); } @@ -73,6 +77,9 @@ static void vm_cgroup_do_uncharge(struct vm_cgroup *vmcg, { unsigned long val = nr_pages << PAGE_SHIFT; + if (vm_cgroup_is_root(vmcg)) + return; + res_counter_uncharge(&vmcg->res, val); } @@ -159,6 +166,9 @@ static u64 vm_cgroup_read_u64(struct cgroup_subsys_state *css, struct vm_cgroup *vmcg = vm_cgroup_from_css(css); int memb = cft->private; + if (vm_cgroup_is_root(vmcg)) + return vm_memory_committed() << PAGE_SHIFT; + return res_counter_read_u64(&vmcg->res, memb); } -- 1.7.10.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
