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SubjectRe: [PATCH -V8 09/16] mm/hugetlb: Add new HugeTLB cgroup
(2012/06/09 17:59), Aneesh Kumar K.V wrote:
> From: "Aneesh Kumar K.V"<aneesh.kumar@linux.vnet.ibm.com>
>
> This patch implements a new controller that allows us to control HugeTLB
> allocations. The extension allows to limit the HugeTLB usage per control
> group and enforces the controller limit during page fault. Since HugeTLB
> doesn't support page reclaim, enforcing the limit at page fault time implies
> that, the application will get SIGBUS signal if it tries to access HugeTLB
> pages beyond its limit. This requires the application to know beforehand
> how much HugeTLB pages it would require for its use.
>
> The charge/uncharge calls will be added to HugeTLB code in later patch.
> Support for cgroup removal will be added in later patches.
>
> Signed-off-by: Aneesh Kumar K.V<aneesh.kumar@linux.vnet.ibm.com>

Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>

some nitpick below.

> ---
> include/linux/cgroup_subsys.h | 6 +++
> include/linux/hugetlb_cgroup.h | 79 ++++++++++++++++++++++++++++
> init/Kconfig | 16 ++++++
> mm/Makefile | 1 +
> mm/hugetlb_cgroup.c | 114 ++++++++++++++++++++++++++++++++++++++++
> 5 files changed, 216 insertions(+)
> create mode 100644 include/linux/hugetlb_cgroup.h
> create mode 100644 mm/hugetlb_cgroup.c
>
> diff --git a/include/linux/cgroup_subsys.h b/include/linux/cgroup_subsys.h
> index 0bd390c..895923a 100644
> --- a/include/linux/cgroup_subsys.h
> +++ b/include/linux/cgroup_subsys.h
> @@ -72,3 +72,9 @@ SUBSYS(net_prio)
> #endif
>
> /* */
> +
> +#ifdef CONFIG_CGROUP_HUGETLB_RES_CTLR
> +SUBSYS(hugetlb)
> +#endif
> +
> +/* */
> diff --git a/include/linux/hugetlb_cgroup.h b/include/linux/hugetlb_cgroup.h
> new file mode 100644
> index 0000000..5794be4
> --- /dev/null
> +++ b/include/linux/hugetlb_cgroup.h
> @@ -0,0 +1,79 @@
> +/*
> + * Copyright IBM Corporation, 2012
> + * Author Aneesh Kumar K.V<aneesh.kumar@linux.vnet.ibm.com>
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms of version 2.1 of the GNU Lesser General Public License
> + * as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it would be useful, but
> + * WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
> + *
> + */
> +
> +#ifndef _LINUX_HUGETLB_CGROUP_H
> +#define _LINUX_HUGETLB_CGROUP_H
> +
> +#include<linux/res_counter.h>
> +
> +struct hugetlb_cgroup {
> + struct cgroup_subsys_state css;
> + /*
> + * the counter to account for hugepages from hugetlb.
> + */
> + struct res_counter hugepage[HUGE_MAX_HSTATE];
> +};
> +
> +#ifdef CONFIG_CGROUP_HUGETLB_RES_CTLR
> +static inline bool hugetlb_cgroup_disabled(void)
> +{
> + if (hugetlb_subsys.disabled)
> + return true;
> + return false;
> +}
> +
> +extern int hugetlb_cgroup_charge_page(int idx, unsigned long nr_pages,
> + struct hugetlb_cgroup **ptr);
> +extern void hugetlb_cgroup_commit_charge(int idx, unsigned long nr_pages,
> + struct hugetlb_cgroup *h_cg,
> + struct page *page);
> +extern void hugetlb_cgroup_uncharge_page(int idx, unsigned long nr_pages,
> + struct page *page);
> +extern void hugetlb_cgroup_uncharge_cgroup(int idx, unsigned long nr_pages,
> + struct hugetlb_cgroup *h_cg);
> +#else
> +static inline bool hugetlb_cgroup_disabled(void)
> +{
> + return true;
> +}
> +
> +static inline int
> +hugetlb_cgroup_charge_page(int idx, unsigned long nr_pages,
> + struct hugetlb_cgroup **ptr)
> +{
> + return 0;
> +}
> +
> +static inline void
> +hugetlb_cgroup_commit_charge(int idx, unsigned long nr_pages,
> + struct hugetlb_cgroup *h_cg,
> + struct page *page)
> +{
> + return;
> +}
> +
> +static inline void
> +hugetlb_cgroup_uncharge_page(int idx, unsigned long nr_pages, struct page *page)
> +{
> + return;
> +}
> +
> +static inline void
> +hugetlb_cgroup_uncharge_cgroup(int idx, unsigned long nr_pages,
> + struct hugetlb_cgroup *h_cg)
> +{
> + return;
> +}
> +#endif /* CONFIG_MEM_RES_CTLR_HUGETLB */
> +#endif
> diff --git a/init/Kconfig b/init/Kconfig
> index d07dcf9..b9a0d0a 100644
> --- a/init/Kconfig
> +++ b/init/Kconfig
> @@ -751,6 +751,22 @@ config CGROUP_MEM_RES_CTLR_KMEM
> the kmem extension can use it to guarantee that no group of processes
> will ever exhaust kernel resources alone.
>
> +config CGROUP_HUGETLB_RES_CTLR
> + bool "HugeTLB Resource Controller for Control Groups"
> + depends on RESOURCE_COUNTERS&& HUGETLB_PAGE&& EXPERIMENTAL
> + select PAGE_CGROUP
> + default n
> + help
> + Provides a simple cgroup Resource Controller for HugeTLB pages.

what you want to say by adding 'simple' here ?


> + When you enable this, you can put a per cgroup limit on HugeTLB usage.
> + The limit is enforced during page fault. Since HugeTLB doesn't
> + support page reclaim, enforcing the limit at page fault time implies
> + that, the application will get SIGBUS signal if it tries to access
> + HugeTLB pages beyond its limit. This requires the application to know
> + beforehand how much HugeTLB pages it would require for its use. The
> + control group is tracked in the third page lru pointer. This means
> + that we cannot use the controller with huge page less than 3 pages.
> +
> config CGROUP_PERF
> bool "Enable perf_event per-cpu per-container group (cgroup) monitoring"
> depends on PERF_EVENTS&& CGROUPS
> diff --git a/mm/Makefile b/mm/Makefile
> index a156285..a8dd8d5 100644
> --- a/mm/Makefile
> +++ b/mm/Makefile
> @@ -48,6 +48,7 @@ obj-$(CONFIG_MIGRATION) += migrate.o
> obj-$(CONFIG_QUICKLIST) += quicklist.o
> obj-$(CONFIG_TRANSPARENT_HUGEPAGE) += huge_memory.o
> obj-$(CONFIG_CGROUP_MEM_RES_CTLR) += memcontrol.o page_cgroup.o
> +obj-$(CONFIG_CGROUP_HUGETLB_RES_CTLR) += hugetlb_cgroup.o
> obj-$(CONFIG_MEMORY_FAILURE) += memory-failure.o
> obj-$(CONFIG_HWPOISON_INJECT) += hwpoison-inject.o
> obj-$(CONFIG_DEBUG_KMEMLEAK) += kmemleak.o
> diff --git a/mm/hugetlb_cgroup.c b/mm/hugetlb_cgroup.c
> new file mode 100644
> index 0000000..20a32c5
> --- /dev/null
> +++ b/mm/hugetlb_cgroup.c
> @@ -0,0 +1,114 @@
> +/*
> + *
> + * Copyright IBM Corporation, 2012
> + * Author Aneesh Kumar K.V<aneesh.kumar@linux.vnet.ibm.com>
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms of version 2.1 of the GNU Lesser General Public License
> + * as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it would be useful, but
> + * WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
> + *
> + */
> +
> +#include<linux/cgroup.h>
> +#include<linux/slab.h>
> +#include<linux/hugetlb.h>
> +#include<linux/hugetlb_cgroup.h>
> +
> +struct cgroup_subsys hugetlb_subsys __read_mostly;
> +struct hugetlb_cgroup *root_h_cgroup __read_mostly;
> +
> +static inline
> +struct hugetlb_cgroup *hugetlb_cgroup_from_css(struct cgroup_subsys_state *s)
> +{
> + if (s)
> + return container_of(s, struct hugetlb_cgroup, css);
> + return NULL;
> +}
> +
> +static inline
> +struct hugetlb_cgroup *hugetlb_cgroup_from_cgroup(struct cgroup *cgroup)
> +{
> + return hugetlb_cgroup_from_css(cgroup_subsys_state(cgroup,
> + hugetlb_subsys_id));
> +}
> +
> +static inline
> +struct hugetlb_cgroup *hugetlb_cgroup_from_task(struct task_struct *task)
> +{
> + return hugetlb_cgroup_from_css(task_subsys_state(task,
> + hugetlb_subsys_id));
> +}
> +
> +static inline bool hugetlb_cgroup_is_root(struct hugetlb_cgroup *h_cg)
> +{
> + return (h_cg == root_h_cgroup);
> +}
> +
> +static inline struct hugetlb_cgroup *parent_hugetlb_cgroup(struct cgroup *cg)
> +{
> + if (!cg->parent)
> + return NULL;
> + return hugetlb_cgroup_from_cgroup(cg->parent);
> +}
> +
> +static inline bool hugetlb_cgroup_have_usage(struct cgroup *cg)
> +{
> + int idx;
> + struct hugetlb_cgroup *h_cg = hugetlb_cgroup_from_cgroup(cg);
> +
> + for (idx = 0; idx< hugetlb_max_hstate; idx++) {
> + if ((res_counter_read_u64(&h_cg->hugepage[idx], RES_USAGE))> 0)
> + return 1;
> + }
> + return 0;
> +}

How about using true/false rather than 0/1 ?


> +
> +static struct cgroup_subsys_state *hugetlb_cgroup_create(struct cgroup *cgroup)
> +{
> + int idx;
> + struct cgroup *parent_cgroup;
> + struct hugetlb_cgroup *h_cgroup, *parent_h_cgroup;
> +
> + h_cgroup = kzalloc(sizeof(*h_cgroup), GFP_KERNEL);
> + if (!h_cgroup)
> + return ERR_PTR(-ENOMEM);
> +
> + parent_cgroup = cgroup->parent;
> + if (parent_cgroup) {
> + parent_h_cgroup = hugetlb_cgroup_from_cgroup(parent_cgroup);
> + for (idx = 0; idx< HUGE_MAX_HSTATE; idx++)
^^^
add space is better.

> + res_counter_init(&h_cgroup->hugepage[idx],
> + &parent_h_cgroup->hugepage[idx]);
> + } else {
> + root_h_cgroup = h_cgroup;
> + for (idx = 0; idx< HUGE_MAX_HSTATE; idx++)
^^^

> + res_counter_init(&h_cgroup->hugepage[idx], NULL);
> + }
> + return&h_cgroup->css;
^^^
ditto.

> +}
> +
> +static void hugetlb_cgroup_destroy(struct cgroup *cgroup)
> +{
> + struct hugetlb_cgroup *h_cgroup;
> +
> + h_cgroup = hugetlb_cgroup_from_cgroup(cgroup);
> + kfree(h_cgroup);
> +}
> +
> +static int hugetlb_cgroup_pre_destroy(struct cgroup *cgroup)
> +{
> + /* We will add the cgroup removal support in later patches */
> + return -EBUSY;
> +}

-ENOTSUP rather than -BUSY :p

> +
> +struct cgroup_subsys hugetlb_subsys = {
> + .name = "hugetlb",
> + .create = hugetlb_cgroup_create,
> + .pre_destroy = hugetlb_cgroup_pre_destroy,
> + .destroy = hugetlb_cgroup_destroy,
> + .subsys_id = hugetlb_subsys_id,
> +};


Thanks,
-Kame



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