[PATCH -next] mm/hugetlb_cgroup: introduce peak and rsvd.peak to v2

Xiu Jianfeng
2024-07-02T13:05:53Z

Introduce peak and rsvd.peak to v2 to show the historical maximum
usage of resources, as in some scenarios it is necessary to configure
the value of max/rsvd.max based on the peak usage of resources.

Signed-off-by: Xiu Jianfeng <xiujianfeng@huawei.com>
---
Documentation/admin-guide/cgroup-v2.rst | 8 ++++++++
mm/hugetlb_cgroup.c | 19 +++++++++++++++++++
2 files changed, 27 insertions(+)

diff --git a/Documentation/admin-guide/cgroup-v2.rst b/Documentation/admin-guide/cgroup-v2.rst
index ae0fdb6fc618..97d19968230a 100644
--- a/Documentation/admin-guide/cgroup-v2.rst
+++ b/Documentation/admin-guide/cgroup-v2.rst
@@ -2607,6 +2607,14 @@ HugeTLB Interface Files
hugetlb pages of <hugepagesize> in this cgroup. Only active in
use hugetlb pages are included. The per-node values are in bytes.

+ hugetlb.<hugepagesize>.peak
+ Show historical maximum usage for "hugepagesize" hugetlb. It exists
+ for all the cgroup except root.
+
+ hugetlb.<hugepagesize>.rsvd.peak
+ Show historical maximum usage for "hugepagesize" hugetlb reservations.
+ It exists for all the cgroup except root.
+
Misc
----

diff --git a/mm/hugetlb_cgroup.c b/mm/hugetlb_cgroup.c
index 4ff238ba1250..f443a56409a9 100644
--- a/mm/hugetlb_cgroup.c
+++ b/mm/hugetlb_cgroup.c
@@ -583,6 +583,13 @@ static int hugetlb_cgroup_read_u64_max(struct seq_file *seq, void *v)
else
seq_printf(seq, "%llu\n", val * PAGE_SIZE);
break;
+ case RES_RSVD_MAX_USAGE:
+ counter = &h_cg->rsvd_hugepage[idx];
+ fallthrough;
+ case RES_MAX_USAGE:
+ val = (u64)counter->watermark;
+ seq_printf(seq, "%llu\n", val * PAGE_SIZE);
+ break;
default:
BUG();
}
@@ -739,6 +746,18 @@ static struct cftype hugetlb_dfl_tmpl[] = {
.seq_show = hugetlb_cgroup_read_u64_max,
.flags = CFTYPE_NOT_ON_ROOT,
},
+ {
+ .name = "peak",
+ .private = RES_MAX_USAGE,
+ .seq_show = hugetlb_cgroup_read_u64_max,
+ .flags = CFTYPE_NOT_ON_ROOT,
+ },
+ {
+ .name = "rsvd.peak",
+ .private = RES_RSVD_MAX_USAGE,
+ .seq_show = hugetlb_cgroup_read_u64_max,
+ .flags = CFTYPE_NOT_ON_ROOT,
+ },
{
.name = "events",
.seq_show = hugetlb_events_show,
--
2.34.1