@@ -29,12 +29,14 @@ Brief summary of control files::
hugetlb.<hugepagesize>.max_usage_in_bytes # show max "hugepagesize" hugetlb usage recorded
hugetlb.<hugepagesize>.usage_in_bytes # show current usage for "hugepagesize" hugetlb
hugetlb.<hugepagesize>.failcnt # show the number of allocation failure due to HugeTLB usage limit
+ hugetlb.<hugepagesize>.numa_stat # show the numa information of the hugetlb memory charged to this cgroup
For a system supporting three hugepage sizes (64k, 32M and 1G), the control
files include::
hugetlb.1GB.limit_in_bytes
hugetlb.1GB.max_usage_in_bytes
+ hugetlb.1GB.numa_stat
hugetlb.1GB.usage_in_bytes
hugetlb.1GB.failcnt
hugetlb.1GB.rsvd.limit_in_bytes
@@ -43,6 +45,7 @@ files include::
hugetlb.1GB.rsvd.failcnt
hugetlb.64KB.limit_in_bytes
hugetlb.64KB.max_usage_in_bytes
+ hugetlb.64KB.numa_stat
hugetlb.64KB.usage_in_bytes
hugetlb.64KB.failcnt
hugetlb.64KB.rsvd.limit_in_bytes
@@ -51,6 +54,7 @@ files include::
hugetlb.64KB.rsvd.failcnt
hugetlb.32MB.limit_in_bytes
hugetlb.32MB.max_usage_in_bytes
+ hugetlb.32MB.numa_stat
hugetlb.32MB.usage_in_bytes
hugetlb.32MB.failcnt
hugetlb.32MB.rsvd.limit_in_bytes
@@ -2252,6 +2252,11 @@ HugeTLB Interface Files
are local to the cgroup i.e. not hierarchical. The file modified event
generated on this file reflects only the local events.
+ hugetlb.<hugepagesize>.numa_stat
+ Similar to memory.numa_stat, it shows the numa information of the
+ hugetlb pages of <hugepagesize> in this cgroup. Only active in
+ use hugetlb pages are included. The per-node values are in bytes.
+
Misc
----
@@ -613,8 +613,8 @@ struct hstate {
#endif
#ifdef CONFIG_CGROUP_HUGETLB
/* cgroup control files */
- struct cftype cgroup_files_dfl[7];
- struct cftype cgroup_files_legacy[9];
+ struct cftype cgroup_files_dfl[8];
+ struct cftype cgroup_files_legacy[10];
#endif
char name[HSTATE_NAME_LEN];
};
@@ -36,6 +36,11 @@ enum hugetlb_memory_event {
HUGETLB_NR_MEMORY_EVENTS,
};
+struct hugetlb_cgroup_per_node {
+ /* hugetlb usage in pages over all hstates. */
+ unsigned long usage[HUGE_MAX_HSTATE];
+};
+
struct hugetlb_cgroup {
struct cgroup_subsys_state css;
@@ -57,6 +62,8 @@ struct hugetlb_cgroup {
/* Handle for "hugetlb.events.local" */
struct cgroup_file events_local_file[HUGE_MAX_HSTATE];
+
+ struct hugetlb_cgroup_per_node *nodeinfo[];
};
static inline struct hugetlb_cgroup *
@@ -126,29 +126,58 @@ static void hugetlb_cgroup_init(struct hugetlb_cgroup *h_cgroup,
}
}
+static void hugetlb_cgroup_free(struct hugetlb_cgroup *h_cgroup)
+{
+ int node;
+
+ for_each_node(node)
+ kfree(h_cgroup->nodeinfo[node]);
+ kfree(h_cgroup);
+}
+
static struct cgroup_subsys_state *
hugetlb_cgroup_css_alloc(struct cgroup_subsys_state *parent_css)
{
struct hugetlb_cgroup *parent_h_cgroup = hugetlb_cgroup_from_css(parent_css);
struct hugetlb_cgroup *h_cgroup;
+ int node;
+
+ h_cgroup = kzalloc(struct_size(h_cgroup, nodeinfo, nr_node_ids),
+ GFP_KERNEL);
- h_cgroup = kzalloc(sizeof(*h_cgroup), GFP_KERNEL);
if (!h_cgroup)
return ERR_PTR(-ENOMEM);
if (!parent_h_cgroup)
root_h_cgroup = h_cgroup;
+ /*
+ * TODO: this routine can waste much memory for nodes which will
+ * never be onlined. It's better to use memory hotplug callback
+ * function.
+ */
+ for_each_node(node) {
+ /* Set node_to_alloc to -1 for offline nodes. */
+ int node_to_alloc =
+ node_state(node, N_NORMAL_MEMORY) ? node : -1;
+ h_cgroup->nodeinfo[node] =
+ kzalloc_node(sizeof(struct hugetlb_cgroup_per_node),
+ GFP_KERNEL, node_to_alloc);
+ if (!h_cgroup->nodeinfo[node])
+ goto fail_alloc_nodeinfo;
+ }
+
hugetlb_cgroup_init(h_cgroup, parent_h_cgroup);
return &h_cgroup->css;
+
+fail_alloc_nodeinfo:
+ hugetlb_cgroup_free(h_cgroup);
+ return ERR_PTR(-ENOMEM);
}
static void hugetlb_cgroup_css_free(struct cgroup_subsys_state *css)
{
- struct hugetlb_cgroup *h_cgroup;
-
- h_cgroup = hugetlb_cgroup_from_css(css);
- kfree(h_cgroup);
+ hugetlb_cgroup_free(hugetlb_cgroup_from_css(css));
}
/*
@@ -292,7 +321,17 @@ static void __hugetlb_cgroup_commit_charge(int idx, unsigned long nr_pages,
return;
__set_hugetlb_cgroup(page, h_cg, rsvd);
- return;
+ if (!rsvd) {
+ unsigned long usage =
+ h_cg->nodeinfo[page_to_nid(page)]->usage[idx];
+ /*
+ * This write is not atomic due to fetching usage and writing
+ * to it, but that's fine because we call this with
+ * hugetlb_lock held anyway.
+ */
+ WRITE_ONCE(h_cg->nodeinfo[page_to_nid(page)]->usage[idx],
+ usage + nr_pages);
+ }
}
void hugetlb_cgroup_commit_charge(int idx, unsigned long nr_pages,
@@ -331,8 +370,17 @@ static void __hugetlb_cgroup_uncharge_page(int idx, unsigned long nr_pages,
if (rsvd)
css_put(&h_cg->css);
-
- return;
+ else {
+ unsigned long usage =
+ h_cg->nodeinfo[page_to_nid(page)]->usage[idx];
+ /*
+ * This write is not atomic due to fetching usage and writing
+ * to it, but that's fine because we call this with
+ * hugetlb_lock held anyway.
+ */
+ WRITE_ONCE(h_cg->nodeinfo[page_to_nid(page)]->usage[idx],
+ usage - nr_pages);
+ }
}
void hugetlb_cgroup_uncharge_page(int idx, unsigned long nr_pages,
@@ -421,6 +469,59 @@ enum {
RES_RSVD_FAILCNT,
};
+static int hugetlb_cgroup_read_numa_stat(struct seq_file *seq, void *dummy)
+{
+ int nid;
+ struct cftype *cft = seq_cft(seq);
+ int idx = MEMFILE_IDX(cft->private);
+ bool legacy = MEMFILE_ATTR(cft->private);
+ struct hugetlb_cgroup *h_cg = hugetlb_cgroup_from_css(seq_css(seq));
+ struct cgroup_subsys_state *css;
+ unsigned long usage;
+
+ if (legacy) {
+ /* Add up usage across all nodes for the non-hierarchical total. */
+ usage = 0;
+ for_each_node_state(nid, N_MEMORY)
+ usage += READ_ONCE(h_cg->nodeinfo[nid]->usage[idx]);
+ seq_printf(seq, "total=%lu", usage * PAGE_SIZE);
+
+ /* Simply print the per-node usage for the non-hierarchical total. */
+ for_each_node_state(nid, N_MEMORY)
+ seq_printf(seq, " N%d=%lu", nid,
+ READ_ONCE(h_cg->nodeinfo[nid]->usage[idx]) *
+ PAGE_SIZE);
+ seq_putc(seq, '\n');
+ }
+
+ /*
+ * The hierarchical total is pretty much the value recorded by the
+ * counter, so use that.
+ */
+ seq_printf(seq, "%stotal=%lu", legacy ? "hierarichal_" : "",
+ page_counter_read(&h_cg->hugepage[idx]) * PAGE_SIZE);
+
+ /*
+ * For each node, transverse the css tree to obtain the hierarichal
+ * node usage.
+ */
+ for_each_node_state(nid, N_MEMORY) {
+ usage = 0;
+ rcu_read_lock();
+ css_for_each_descendant_pre(css, &h_cg->css) {
+ usage += READ_ONCE(hugetlb_cgroup_from_css(css)
+ ->nodeinfo[nid]
+ ->usage[idx]);
+ }
+ rcu_read_unlock();
+ seq_printf(seq, " N%d=%lu", nid, usage * PAGE_SIZE);
+ }
+
+ seq_putc(seq, '\n');
+
+ return 0;
+}
+
static u64 hugetlb_cgroup_read_u64(struct cgroup_subsys_state *css,
struct cftype *cft)
{
@@ -671,8 +772,14 @@ static void __init __hugetlb_cgroup_file_dfl_init(int idx)
events_local_file[idx]);
cft->flags = CFTYPE_NOT_ON_ROOT;
- /* NULL terminate the last cft */
+ /* Add the numa stat file */
cft = &h->cgroup_files_dfl[6];
+ snprintf(cft->name, MAX_CFTYPE_NAME, "%s.numa_stat", buf);
+ cft->seq_show = hugetlb_cgroup_read_numa_stat;
+ cft->flags = CFTYPE_NOT_ON_ROOT;
+
+ /* NULL terminate the last cft */
+ cft = &h->cgroup_files_dfl[7];
memset(cft, 0, sizeof(*cft));
WARN_ON(cgroup_add_dfl_cftypes(&hugetlb_cgrp_subsys,
@@ -742,8 +849,14 @@ static void __init __hugetlb_cgroup_file_legacy_init(int idx)
cft->write = hugetlb_cgroup_reset;
cft->read_u64 = hugetlb_cgroup_read_u64;
+ /* Add the numa stat file */
+ cft = &h->cgroup_files_dfl[8];
+ snprintf(cft->name, MAX_CFTYPE_NAME, "%s.numa_stat", buf);
+ cft->private = MEMFILE_PRIVATE(idx, 1);
+ cft->seq_show = hugetlb_cgroup_read_numa_stat;
+
/* NULL terminate the last cft */
- cft = &h->cgroup_files_legacy[8];
+ cft = &h->cgroup_files_legacy[9];
memset(cft, 0, sizeof(*cft));
WARN_ON(cgroup_add_legacy_cftypes(&hugetlb_cgrp_subsys,
For hugetlb backed jobs/VMs it's critical to understand the numa information for the memory backing these jobs to deliver optimal performance. Currently this technically can be queried from /proc/self/numa_maps, but there are significant issues with that. Namely: 1. Memory can be mapped or unmapped. 2. numa_maps are per process and need to be aggregated across all processes in the cgroup. For shared memory this is more involved as the userspace needs to make sure it doesn't double count shared mappings. 3. I believe querying numa_maps needs to hold the mmap_lock which adds to the contention on this lock. For these reasons I propose simply adding hugetlb.*.numa_stat file, which shows the numa information of the cgroup similarly to memory.numa_stat. On cgroup-v2: cat /sys/fs/cgroup/unified/test/hugetlb.2MB.numa_stat total=2097152 N0=2097152 N1=0 On cgroup-v1: cat /sys/fs/cgroup/hugetlb/test/hugetlb.2MB.numa_stat total=2097152 N0=2097152 N1=0 hierarichal_total=2097152 N0=2097152 N1=0 This patch was tested manually by allocating hugetlb memory and querying the hugetlb.*.numa_stat file of the cgroup and its parents.  Cc: Mike Kravetz <mike.kravetz@oracle.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Shuah Khan <shuah@kernel.org> Cc: Miaohe Lin <linmiaohe@huawei.com> Cc: Oscar Salvador <osalvador@suse.de> Cc: Michal Hocko <mhocko@suse.com> Cc: Muchun Song <songmuchun@bytedance.com> Cc: David Rientjes <rientjes@google.com> Cc: Shakeel Butt <shakeelb@google.com> Cc: Jue Wang <juew@google.com> Cc: Yang Yao <ygyao@google.com> Cc: Joanna Li <joannali@google.com> Cc: Cannon Matthews <cannonmatthews@google.com> Cc: linux-mm@kvack.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Mina Almasry <almasrymina@google.com> --- Changes in v8: - Do not use unsigned long *usage to WRITE_ONCE() new usage values. Changes in v7: - Converted back usage to unsigned long + READ_ONCE/WRITE_ONCE rather than atomic_long_t Changes in v6: - Changed usage from unsigned long to atomic_long_t Changes in v5: - Fixed commit message typo. - Fixed per node usage documentation to be in pages. - Removed unnecessary h_cg check. Changes in v4: - Removed unnecessary braces. - usage is now counted in pages instead of bytes. - Reverted unneeded changes to write_to_hugetlbfs.c Changes in v3: - Fixed typos (sorry!) - Used conventional locations for cgroups mount points in docs/commit message. - Updated docs. - Handle kzalloc_node failure, and proper deallocation of per node data. - Use struct_size() to calculate the struct size. - Use nr_node_ids instead of MAX_NUMNODES. - Updated comments per multi-line comment pattern. Changes in v2: - Fix warning Reported-by: kernel test robot <lkp@intel.com> --- .../admin-guide/cgroup-v1/hugetlb.rst | 4 + Documentation/admin-guide/cgroup-v2.rst | 5 + include/linux/hugetlb.h | 4 +- include/linux/hugetlb_cgroup.h | 7 + mm/hugetlb_cgroup.c | 133 ++++++++++++++++-- 5 files changed, 141 insertions(+), 12 deletions(-) -- 2.34.0.rc2.393.gf8c9666880-goog