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Date: Sat, 9 Jun 2012 07:19:47 -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 -V8 13/16] hugetlb/cgroup: add hugetlb cgroup control
files
> const unsigned long hugetlb_zero = 0, hugetlb_infinity = ~0UL;
> @@ -1916,6 +1917,13 @@ 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);
> + /*
> + * Add cgroup control files only if the huge page consists
> + * of more than two normal pages. This is because we use
Not three? I thought the earlier patches said three?
> + * page[2].lru.next for storing cgoup details.
cgoup?
> + */
> + if (order >= 2)
> + hugetlb_cgroup_file_init(hugetlb_max_hstate - 1);
>
> parsed_hstate = h;
> }
> diff --git a/mm/hugetlb_cgroup.c b/mm/hugetlb_cgroup.c
> index 9458fe3..2a4881d 100644
> --- a/mm/hugetlb_cgroup.c
> +++ b/mm/hugetlb_cgroup.c
> @@ -18,6 +18,11 @@
> #include <linux/hugetlb.h>
> #include <linux/hugetlb_cgroup.h>
>
> +/* lifted from mem control */
And you can also life the comment from mem control explaining
what these defines are good for.
> +#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;
>
> @@ -269,6 +274,131 @@ 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];
Why no #define? Wait a minute - didn't I provide a similar comment last
time? So why the reason to stick without the #define's?
> + 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];
Ditto.
> + struct cftype *cft;
> + struct hstate *h = &hstates[idx];
> +
> + /* format the size */
> + mem_fmt(buf, 32, huge_page_size(h));
Ditto.
> +
> + /* Add the limit file */
> + cft = &h->cgroup_files[0];
Can't this be just:
cfg = &h->cgroup_files;
> + 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];
and this be:
cft++;
> + 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];
and so for this one.
> + 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];
and for that one?
> + memset(cft, 0, sizeof(*cft));
> +
> + WARN_ON(cgroup_add_cftypes(&hugetlb_subsys, h->cgroup_files));
> +
> + return 0;
> +}
> +
> struct cgroup_subsys hugetlb_subsys = {
> .name = "hugetlb",
> .create = hugetlb_cgroup_create,
> --
> 1.7.10
>
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