These counters will track hugetlb reservations rather than hugetlb
memory faulted in. This patch only adds the counter, following patches
add the charging and uncharging of the counter.
---
include/linux/hugetlb.h | 2 +-
mm/hugetlb_cgroup.c | 86 +++++++++++++++++++++++++++++++++++++----
2 files changed, 80 insertions(+), 8 deletions(-)
diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
index edfca42783192..6777b3013345d 100644
--- a/include/linux/hugetlb.h
+++ b/include/linux/hugetlb.h
@@ -340,7 +340,7 @@ struct hstate {
unsigned int surplus_huge_pages_node[MAX_NUMNODES];
#ifdef CONFIG_CGROUP_HUGETLB
/* cgroup control files */
- struct cftype cgroup_files[5];
+ struct cftype cgroup_files[9];
#endif
char name[HSTATE_NAME_LEN];
};
diff --git a/mm/hugetlb_cgroup.c b/mm/hugetlb_cgroup.c
index 68c2f2f3c05b7..708103663988a 100644
--- a/mm/hugetlb_cgroup.c
+++ b/mm/hugetlb_cgroup.c
@@ -25,6 +25,10 @@ struct hugetlb_cgroup {
* the counter to account for hugepages from hugetlb.
*/
struct page_counter hugepage[HUGE_MAX_HSTATE];
+ /*
+ * the counter to account for hugepage reservations from hugetlb.
+ */
+ struct page_counter reserved_hugepage[HUGE_MAX_HSTATE];
};
#define MEMFILE_PRIVATE(x, val) (((x) << 16) | (val))
@@ -33,6 +37,15 @@ struct hugetlb_cgroup {
static struct hugetlb_cgroup *root_h_cgroup __read_mostly;
+static inline
+struct page_counter *get_counter(struct hugetlb_cgroup *h_cg, int idx,
+ bool reserved)
+{
+ if (reserved)
+ return &h_cg->reserved_hugepage[idx];
+ return &h_cg->hugepage[idx];
+}
+
static inline
struct hugetlb_cgroup *hugetlb_cgroup_from_css(struct cgroup_subsys_state *s)
{
@@ -256,28 +269,42 @@ void hugetlb_cgroup_uncharge_cgroup(int idx, unsigned
long nr_pages,
enum {
RES_USAGE,
+ RES_RESERVATION_USAGE,
RES_LIMIT,
+ RES_RESERVATION_LIMIT,
RES_MAX_USAGE,
+ RES_RESERVATION_MAX_USAGE,
RES_FAILCNT,
+ RES_RESERVATION_FAILCNT,
};
static u64 hugetlb_cgroup_read_u64(struct cgroup_subsys_state *css,
struct cftype *cft)
{
struct page_counter *counter;
+ struct page_counter *reserved_counter;
struct hugetlb_cgroup *h_cg = hugetlb_cgroup_from_css(css);
counter = &h_cg->hugepage[MEMFILE_IDX(cft->private)];
+ reserved_counter = &h_cg->reserved_hugepage[MEMFILE_IDX(cft->private)];
switch (MEMFILE_ATTR(cft->private)) {
case RES_USAGE:
return (u64)page_counter_read(counter) * PAGE_SIZE;
+ case RES_RESERVATION_USAGE:
+ return (u64)page_counter_read(reserved_counter) * PAGE_SIZE;
case RES_LIMIT:
return (u64)counter->max * PAGE_SIZE;
+ case RES_RESERVATION_LIMIT:
+ return (u64)reserved_counter->max * PAGE_SIZE;
case RES_MAX_USAGE:
return (u64)counter->watermark * PAGE_SIZE;
+ case RES_RESERVATION_MAX_USAGE:
+ return (u64)reserved_counter->watermark * PAGE_SIZE;
case RES_FAILCNT:
return counter->failcnt;
+ case RES_RESERVATION_FAILCNT:
+ return reserved_counter->failcnt;
default:
BUG();
}
@@ -291,6 +318,7 @@ static ssize_t hugetlb_cgroup_write(struct kernfs_open_file
*of,
int ret, idx;
unsigned long nr_pages;
struct hugetlb_cgroup *h_cg = hugetlb_cgroup_from_css(of_css(of));
+ bool reserved = false;
if (hugetlb_cgroup_is_root(h_cg)) /* Can't set limit on root */
return -EINVAL;
@@ -303,10 +331,16 @@ static ssize_t hugetlb_cgroup_write(struct
kernfs_open_file *of,
idx = MEMFILE_IDX(of_cft(of)->private);
nr_pages = round_down(nr_pages, 1 << huge_page_order(&hstates[idx]));
+ if (MEMFILE_ATTR(of_cft(of)->private) == RES_RESERVATION_LIMIT) {
+ reserved = true;
+ }
+
switch (MEMFILE_ATTR(of_cft(of)->private)) {
+ case RES_RESERVATION_LIMIT:
case RES_LIMIT:
mutex_lock(&hugetlb_limit_mutex);
- ret = page_counter_set_max(&h_cg->hugepage[idx], nr_pages);
+ ret = page_counter_set_max(get_counter(h_cg, idx, reserved),
+ nr_pages);
mutex_unlock(&hugetlb_limit_mutex);
break;
default:
@@ -320,18 +354,26 @@ static ssize_t hugetlb_cgroup_reset(struct
kernfs_open_file *of,
char *buf, size_t nbytes, loff_t off)
{
int ret = 0;
- struct page_counter *counter;
+ struct page_counter *counter, *reserved_counter;
struct hugetlb_cgroup *h_cg = hugetlb_cgroup_from_css(of_css(of));
counter = &h_cg->hugepage[MEMFILE_IDX(of_cft(of)->private)];
+ reserved_counter = &h_cg->reserved_hugepage[
+ MEMFILE_IDX(of_cft(of)->private)];
switch (MEMFILE_ATTR(of_cft(of)->private)) {
case RES_MAX_USAGE:
page_counter_reset_watermark(counter);
break;
+ case RES_RESERVATION_MAX_USAGE:
+ page_counter_reset_watermark(reserved_counter);
+ break;
case RES_FAILCNT:
counter->failcnt = 0;
break;
+ case RES_RESERVATION_FAILCNT:
+ reserved_counter->failcnt = 0;
+ break;
default:
ret = -EINVAL;
break;
@@ -357,7 +399,7 @@ static void __init __hugetlb_cgroup_file_init(int idx)
struct hstate *h = &hstates[idx];
/* format the size */
- mem_fmt(buf, 32, huge_page_size(h));
+ mem_fmt(buf, sizeof(buf), huge_page_size(h));
/* Add the limit file */
cft = &h->cgroup_files[0];
@@ -366,28 +408,58 @@ static void __init __hugetlb_cgroup_file_init(int idx)
cft->read_u64 = hugetlb_cgroup_read_u64;
cft->write = hugetlb_cgroup_write;
- /* Add the usage file */
+ /* Add the reservation limit file */
cft = &h->cgroup_files[1];
+ snprintf(cft->name, MAX_CFTYPE_NAME, "%s.reservation_limit_in_bytes",
+ buf);
+ cft->private = MEMFILE_PRIVATE(idx, RES_RESERVATION_LIMIT);
+ cft->read_u64 = hugetlb_cgroup_read_u64;
+ cft->write = hugetlb_cgroup_write;
+
+ /* Add the usage file */
+ cft = &h->cgroup_files[2];
snprintf(cft->name, MAX_CFTYPE_NAME, "%s.usage_in_bytes", buf);
cft->private = MEMFILE_PRIVATE(idx, RES_USAGE);
cft->read_u64 = hugetlb_cgroup_read_u64;
+ /* Add the reservation usage file */
+ cft = &h->cgroup_files[3];
+ snprintf(cft->name, MAX_CFTYPE_NAME, "%s.reservation_usage_in_bytes",
+ buf);
+ cft->private = MEMFILE_PRIVATE(idx, RES_RESERVATION_USAGE);
+ cft->read_u64 = hugetlb_cgroup_read_u64;
+
/* Add the MAX usage file */
- cft = &h->cgroup_files[2];
+ cft = &h->cgroup_files[4];
snprintf(cft->name, MAX_CFTYPE_NAME, "%s.max_usage_in_bytes", buf);
cft->private = MEMFILE_PRIVATE(idx, RES_MAX_USAGE);
cft->write = hugetlb_cgroup_reset;
cft->read_u64 = hugetlb_cgroup_read_u64;
+ /* Add the MAX reservation usage file */
+ cft = &h->cgroup_files[5];
+ snprintf(cft->name, MAX_CFTYPE_NAME,
+ "%s.reservation_max_usage_in_bytes", buf);
+ cft->private = MEMFILE_PRIVATE(idx, RES_RESERVATION_MAX_USAGE);
+ cft->write = hugetlb_cgroup_reset;
+ cft->read_u64 = hugetlb_cgroup_read_u64;
+
/* Add the failcntfile */
- cft = &h->cgroup_files[3];
+ cft = &h->cgroup_files[6];
snprintf(cft->name, MAX_CFTYPE_NAME, "%s.failcnt", buf);
cft->private = MEMFILE_PRIVATE(idx, RES_FAILCNT);
cft->write = hugetlb_cgroup_reset;
cft->read_u64 = hugetlb_cgroup_read_u64;
+ /* Add the reservation failcntfile */
+ cft = &h->cgroup_files[7];
+ snprintf(cft->name, MAX_CFTYPE_NAME, "%s.reservation_failcnt", buf);
+ cft->private = MEMFILE_PRIVATE(idx, RES_FAILCNT);
+ cft->write = hugetlb_cgroup_reset;
+ cft->read_u64 = hugetlb_cgroup_read_u64;
+
/* NULL terminate the last cft */
- cft = &h->cgroup_files[4];
+ cft = &h->cgroup_files[8];
memset(cft, 0, sizeof(*cft));
WARN_ON(cgroup_add_legacy_cftypes(&hugetlb_cgrp_subsys,
--
2.23.0.rc1.153.gdeed80330f-goog
