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Message-ID: <20120531013225.GF401@localhost.localdomain>
Date: Wed, 30 May 2012 21:32:25 -0400
From: Konrad Rzeszutek Wilk <konrad@...nok.org>
To: "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
Cc: linux-mm@...ck.org, kamezawa.hiroyu@...fujitsu.com,
dhillf@...il.com, rientjes@...gle.com, mhocko@...e.cz,
akpm@...ux-foundation.org, hannes@...xchg.org,
linux-kernel@...r.kernel.org, cgroups@...r.kernel.org
Subject: Re: [PATCH -V7 11/14] hugetlbfs: add hugetlb cgroup control files
On Wed, May 30, 2012 at 08:08:56PM +0530, Aneesh Kumar K.V wrote:
> From: "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
>
> Add the control files for hugetlb controller
>
> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@...ux.vnet.ibm.com>
> ---
> include/linux/hugetlb.h | 5 ++
> include/linux/hugetlb_cgroup.h | 6 ++
> mm/hugetlb.c | 2 +
> mm/hugetlb_cgroup.c | 130 ++++++++++++++++++++++++++++++++++++++++
> 4 files changed, 143 insertions(+)
>
> diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
> index dcd55c7..92f75a5 100644
> --- a/include/linux/hugetlb.h
> +++ b/include/linux/hugetlb.h
> @@ -4,6 +4,7 @@
> #include <linux/mm_types.h>
> #include <linux/fs.h>
> #include <linux/hugetlb_inline.h>
> +#include <linux/cgroup.h>
>
> struct ctl_table;
> struct user_struct;
> @@ -221,6 +222,10 @@ struct hstate {
> unsigned int nr_huge_pages_node[MAX_NUMNODES];
> unsigned int free_huge_pages_node[MAX_NUMNODES];
> unsigned int surplus_huge_pages_node[MAX_NUMNODES];
> +#ifdef CONFIG_CGROUP_HUGETLB_RES_CTLR
> + /* cgroup control files */
> + struct cftype cgroup_files[5];
Why five? Should there be a #define for this magic value?
> +#endif
> char name[HSTATE_NAME_LEN];
> };
>
> diff --git a/include/linux/hugetlb_cgroup.h b/include/linux/hugetlb_cgroup.h
> index 5794be4..fbf8c5f 100644
> --- a/include/linux/hugetlb_cgroup.h
> +++ b/include/linux/hugetlb_cgroup.h
> @@ -42,6 +42,7 @@ 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);
> +extern int hugetlb_cgroup_file_init(int idx) __init;
> #else
> static inline bool hugetlb_cgroup_disabled(void)
> {
> @@ -75,5 +76,10 @@ hugetlb_cgroup_uncharge_cgroup(int idx, unsigned long nr_pages,
> {
> return;
> }
> +
> +static inline int __init hugetlb_cgroup_file_init(int idx)
> +{
> + return 0;
> +}
> #endif /* CONFIG_MEM_RES_CTLR_HUGETLB */
> #endif
> diff --git a/mm/hugetlb.c b/mm/hugetlb.c
> index 53840dd..6330de2 100644
> --- a/mm/hugetlb.c
> +++ b/mm/hugetlb.c
> @@ -29,6 +29,7 @@
> #include <linux/io.h>
> #include <linux/hugetlb.h>
> #include <linux/node.h>
> +#include <linux/hugetlb_cgroup.h>
> #include "internal.h"
>
> const unsigned long hugetlb_zero = 0, hugetlb_infinity = ~0UL;
> @@ -1912,6 +1913,7 @@ void __init hugetlb_add_hstate(unsigned order)
> h->next_nid_to_free = first_node(node_states[N_HIGH_MEMORY]);
> snprintf(h->name, HSTATE_NAME_LEN, "hugepages-%lukB",
> huge_page_size(h)/1024);
> + hugetlb_cgroup_file_init(hugetlb_max_hstate - 1);
>
> parsed_hstate = h;
> }
> diff --git a/mm/hugetlb_cgroup.c b/mm/hugetlb_cgroup.c
> index 3a288f7..49a3f20 100644
> --- a/mm/hugetlb_cgroup.c
> +++ b/mm/hugetlb_cgroup.c
> @@ -19,6 +19,11 @@
> #include <linux/page_cgroup.h>
> #include <linux/hugetlb_cgroup.h>
>
> +/* lifted from mem control */
Might also include the comment from said file explaining the
purpose of these #define.
> +#define MEMFILE_PRIVATE(x, val) (((x) << 16) | (val))
> +#define MEMFILE_IDX(val) (((val) >> 16) & 0xffff)
> +#define MEMFILE_ATTR(val) ((val) & 0xffff)
> +
> struct cgroup_subsys hugetlb_subsys __read_mostly;
> struct hugetlb_cgroup *root_h_cgroup __read_mostly;
>
> @@ -271,6 +276,131 @@ void hugetlb_cgroup_uncharge_cgroup(int idx, unsigned long nr_pages,
> return;
> }
>
> +static ssize_t hugetlb_cgroup_read(struct cgroup *cgroup, struct cftype *cft,
> + struct file *file, char __user *buf,
> + size_t nbytes, loff_t *ppos)
> +{
> + u64 val;
> + char str[64];
I would think there would be a define for this somewhere?
> + int idx, name, len;
> + struct hugetlb_cgroup *h_cg = hugetlb_cgroup_from_cgroup(cgroup);
> +
> + idx = MEMFILE_IDX(cft->private);
> + name = MEMFILE_ATTR(cft->private);
> +
> + val = res_counter_read_u64(&h_cg->hugepage[idx], name);
> + len = scnprintf(str, sizeof(str), "%llu\n", (unsigned long long)val);
> + return simple_read_from_buffer(buf, nbytes, ppos, str, len);
> +}
> +
> +static int hugetlb_cgroup_write(struct cgroup *cgroup, struct cftype *cft,
> + const char *buffer)
> +{
> + int idx, name, ret;
> + unsigned long long val;
> + struct hugetlb_cgroup *h_cg = hugetlb_cgroup_from_cgroup(cgroup);
> +
> + idx = MEMFILE_IDX(cft->private);
> + name = MEMFILE_ATTR(cft->private);
> +
> + switch (name) {
> + case RES_LIMIT:
> + if (hugetlb_cgroup_is_root(h_cg)) {
> + /* Can't set limit on root */
> + ret = -EINVAL;
> + break;
> + }
> + /* This function does all necessary parse...reuse it */
> + ret = res_counter_memparse_write_strategy(buffer, &val);
> + if (ret)
> + break;
> + ret = res_counter_set_limit(&h_cg->hugepage[idx], val);
> + break;
> + default:
> + ret = -EINVAL;
> + break;
> + }
> + return ret;
> +}
> +
> +static int hugetlb_cgroup_reset(struct cgroup *cgroup, unsigned int event)
> +{
> + int idx, name, ret = 0;
> + struct hugetlb_cgroup *h_cg = hugetlb_cgroup_from_cgroup(cgroup);
> +
> + idx = MEMFILE_IDX(event);
> + name = MEMFILE_ATTR(event);
> +
> + switch (name) {
> + case RES_MAX_USAGE:
> + res_counter_reset_max(&h_cg->hugepage[idx]);
> + break;
> + case RES_FAILCNT:
> + res_counter_reset_failcnt(&h_cg->hugepage[idx]);
> + break;
> + default:
> + ret = -EINVAL;
> + break;
> + }
> + return ret;
> +}
> +
> +static char *mem_fmt(char *buf, int size, unsigned long hsize)
> +{
> + if (hsize >= (1UL << 30))
> + snprintf(buf, size, "%luGB", hsize >> 30);
> + else if (hsize >= (1UL << 20))
> + snprintf(buf, size, "%luMB", hsize >> 20);
> + else
> + snprintf(buf, size, "%luKB", hsize >> 10);
> + return buf;
> +}
> +
> +int __init hugetlb_cgroup_file_init(int idx)
> +{
> + char buf[32];
#define pls.
> + struct cftype *cft;
> + struct hstate *h = &hstates[idx];
> +
> + /* format the size */
> + mem_fmt(buf, 32, huge_page_size(h));
> +
> + /* Add the limit file */
> + cft = &h->cgroup_files[0];
> + snprintf(cft->name, MAX_CFTYPE_NAME, "%s.limit_in_bytes", buf);
> + cft->private = MEMFILE_PRIVATE(idx, RES_LIMIT);
> + cft->read = hugetlb_cgroup_read;
> + cft->write_string = hugetlb_cgroup_write;
> +
> + /* Add the usage file */
> + cft = &h->cgroup_files[1];
> + snprintf(cft->name, MAX_CFTYPE_NAME, "%s.usage_in_bytes", buf);
> + cft->private = MEMFILE_PRIVATE(idx, RES_USAGE);
> + cft->read = hugetlb_cgroup_read;
> +
> + /* Add the MAX usage file */
> + cft = &h->cgroup_files[2];
> + snprintf(cft->name, MAX_CFTYPE_NAME, "%s.max_usage_in_bytes", buf);
> + cft->private = MEMFILE_PRIVATE(idx, RES_MAX_USAGE);
> + cft->trigger = hugetlb_cgroup_reset;
> + cft->read = hugetlb_cgroup_read;
> +
> + /* Add the failcntfile */
> + cft = &h->cgroup_files[3];
> + snprintf(cft->name, MAX_CFTYPE_NAME, "%s.failcnt", buf);
> + cft->private = MEMFILE_PRIVATE(idx, RES_FAILCNT);
> + cft->trigger = hugetlb_cgroup_reset;
> + cft->read = hugetlb_cgroup_read;
> +
> + /* NULL terminate the last cft */
> + cft = &h->cgroup_files[4];
> + memset(cft, 0, sizeof(*cft));
> +
> + WARN_ON(cgroup_add_cftypes(&hugetlb_subsys, h->cgroup_files));
> +
Wouldn't doing:
return cgroup_add_cftypes(&hugetlb_subsys, h->cgroup_files);
be more appropiate?
> + return 0;
> +}
> +
> struct cgroup_subsys hugetlb_subsys = {
> .name = "hugetlb",
> .create = hugetlb_cgroup_create,
> --
> 1.7.10
>
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