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Date: Tue, 2 Nov 2021 13:11:42 +0800
From: Muchun Song <songmuchun@...edance.com>
To: Mina Almasry <almasrymina@...gle.com>
Cc: Mike Kravetz <mike.kravetz@...cle.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Shuah Khan <shuah@...nel.org>,
Miaohe Lin <linmiaohe@...wei.com>,
Oscar Salvador <osalvador@...e.de>,
Michal Hocko <mhocko@...e.com>,
David Rientjes <rientjes@...gle.com>,
Jue Wang <juew@...gle.com>, Yang Yao <ygyao@...gle.com>,
Joanna Li <joannali@...gle.com>,
Cannon Matthews <cannonmatthews@...gle.com>,
Linux Memory Management List <linux-mm@...ck.org>,
LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] hugetlb: Add hugetlb.*.numa_stat file
On Thu, Oct 21, 2021 at 3:09 AM Mina Almasry <almasrymina@...gle.com> wrote:
>
> 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 techinically can be queried from /proc/self/numa_maps, but
> there are significant issues with that. Namely:
> 1. Memory can be mapped on unmapped.
> 2. numa_maps are per process and need to be aggregaged across all
> proceses 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 /dev/cgroup/memory/test/hugetlb.2MB.numa_stat
> total=2097152 N0=2097152 N1=0
>
> On cgroup-v1:
> cat /dev/cgroup/memory/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@...cle.com>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Shuah Khan <shuah@...nel.org>
> Cc: Miaohe Lin <linmiaohe@...wei.com>
> Cc: Oscar Salvador <osalvador@...e.de>
> Cc: Michal Hocko <mhocko@...e.com>
> Cc: Muchun Song <songmuchun@...edance.com>
> Cc: David Rientjes <rientjes@...gle.com>
> Cc: Jue Wang <juew@...gle.com>
> Cc: Yang Yao <ygyao@...gle.com>
> Cc: Joanna Li <joannali@...gle.com>
> Cc: Cannon Matthews <cannonmatthews@...gle.com>
> Cc: linux-mm@...ck.org
> Cc: linux-kernel@...r.kernel.org
>
> Signed-off-by: Mina Almasry <almasrymina@...gle.com>
>
> ---
>
> Changes in v2:
> - Fix warning Reported-by: kernel test robot <lkp@...el.com>
> ---
> .../admin-guide/cgroup-v1/hugetlb.rst | 4 +
> Documentation/admin-guide/cgroup-v2.rst | 7 ++
> include/linux/hugetlb.h | 4 +-
> include/linux/hugetlb_cgroup.h | 7 ++
> mm/hugetlb_cgroup.c | 93 +++++++++++++++++--
> .../testing/selftests/vm/write_to_hugetlbfs.c | 9 +-
> 6 files changed, 113 insertions(+), 11 deletions(-)
>
> diff --git a/Documentation/admin-guide/cgroup-v1/hugetlb.rst b/Documentation/admin-guide/cgroup-v1/hugetlb.rst
> index 338f2c7d7a1c..0fa724d82abb 100644
> --- a/Documentation/admin-guide/cgroup-v1/hugetlb.rst
> +++ b/Documentation/admin-guide/cgroup-v1/hugetlb.rst
> @@ -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
> diff --git a/Documentation/admin-guide/cgroup-v2.rst b/Documentation/admin-guide/cgroup-v2.rst
> index 4d8c27eca96b..8ba0d6aadd2c 100644
> --- a/Documentation/admin-guide/cgroup-v2.rst
> +++ b/Documentation/admin-guide/cgroup-v2.rst
> @@ -2252,6 +2252,13 @@ 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
> + memory in this cgroup:
> +
> + /dev/cgroup/memory/test # cat hugetlb.2MB.numa_stat
> + total=0 N0=0 N1=0
> +
> Misc
> ----
>
> diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
> index 1faebe1cd0ed..0445faaa636e 100644
> --- a/include/linux/hugetlb.h
> +++ b/include/linux/hugetlb.h
> @@ -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];
> };
> diff --git a/include/linux/hugetlb_cgroup.h b/include/linux/hugetlb_cgroup.h
> index c137396129db..54ff6ec68ed3 100644
> --- a/include/linux/hugetlb_cgroup.h
> +++ b/include/linux/hugetlb_cgroup.h
> @@ -36,6 +36,11 @@ enum hugetlb_memory_event {
> HUGETLB_NR_MEMORY_EVENTS,
> };
>
> +struct hugetlb_cgroup_per_node {
> + /* hugetlb usage in bytes 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 *
> diff --git a/mm/hugetlb_cgroup.c b/mm/hugetlb_cgroup.c
> index 5383023d0cca..4b807292f7e8 100644
> --- a/mm/hugetlb_cgroup.c
> +++ b/mm/hugetlb_cgroup.c
> @@ -92,6 +92,7 @@ static void hugetlb_cgroup_init(struct hugetlb_cgroup *h_cgroup,
> struct hugetlb_cgroup *parent_h_cgroup)
> {
> int idx;
> + int node;
>
> for (idx = 0; idx < HUGE_MAX_HSTATE; idx++) {
> struct page_counter *fault_parent = NULL;
> @@ -124,6 +125,15 @@ static void hugetlb_cgroup_init(struct hugetlb_cgroup *h_cgroup,
> limit);
> VM_BUG_ON(ret);
> }
> +
> + 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);
> + }
> }
>
> static struct cgroup_subsys_state *
> @@ -132,7 +142,10 @@ 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;
>
> - h_cgroup = kzalloc(sizeof(*h_cgroup), GFP_KERNEL);
> + unsigned int size =
> + sizeof(*h_cgroup) +
> + MAX_NUMNODES * sizeof(struct hugetlb_cgroup_per_node *);
> + h_cgroup = kzalloc(size, GFP_KERNEL);
I recommend using struct_size() to calculate the allocated size like
following.
h_cgroup = kzalloc(struct_size(h_cgroup, nodeinfo, MAX_NUMNODES), GFP_KERNEL);
I also have a question, can't we replace MAX_NUMNODES with
nr_node_ids here? In that case, we can save some memory.
> if (!h_cgroup)
> return ERR_PTR(-ENOMEM);
>
> @@ -292,7 +305,9 @@ static void __hugetlb_cgroup_commit_charge(int idx, unsigned long nr_pages,
> return;
>
> __set_hugetlb_cgroup(page, h_cg, rsvd);
> - return;
> + if (!rsvd && h_cg)
> + h_cg->nodeinfo[page_to_nid(page)]->usage[idx] += nr_pages
> + << PAGE_SHIFT;
> }
>
> void hugetlb_cgroup_commit_charge(int idx, unsigned long nr_pages,
> @@ -331,7 +346,9 @@ static void __hugetlb_cgroup_uncharge_page(int idx, unsigned long nr_pages,
>
> if (rsvd)
> css_put(&h_cg->css);
> -
> + else
> + h_cg->nodeinfo[page_to_nid(page)]->usage[idx] -= nr_pages
> + << PAGE_SHIFT;
> return;
> }
>
> @@ -421,6 +438,56 @@ 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 += h_cg->nodeinfo[nid]->usage[idx];
> + seq_printf(seq, "total=%lu", usage);
> +
> + /* 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,
> + h_cg->nodeinfo[nid]->usage[idx]);
> + seq_putc(seq, '\n');
> + }
> +
> + /* The hierarchical total is pretty much the value recorded by the
> + * counter, so use that.
> + */
Please use the following pattern for multi-line comments.
/*
* Comments.
*/
> + 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.
> + */
Same here.
> + for_each_node_state(nid, N_MEMORY) {
> + usage = 0;
> + rcu_read_lock();
> + css_for_each_descendant_pre(css, &h_cg->css) {
> + usage += hugetlb_cgroup_from_css(css)
> + ->nodeinfo[nid]
> + ->usage[idx];
> + }
> + rcu_read_unlock();
> + seq_printf(seq, " N%d=%lu", nid, usage);
> + }
> +
> + seq_putc(seq, '\n');
> +
> + return 0;
> +}
> +
> static u64 hugetlb_cgroup_read_u64(struct cgroup_subsys_state *css,
> struct cftype *cft)
> {
> @@ -654,8 +721,14 @@ static void __init __hugetlb_cgroup_file_dfl_init(int idx)
> cft->seq_show = hugetlb_cgroup_read_u64_max;
> cft->flags = CFTYPE_NOT_ON_ROOT;
>
> - /* Add the events file */
> + /* Add the numa stat file */
> cft = &h->cgroup_files_dfl[4];
Why not use &h->cgroup_files_dfl[6] as a numa stat file?
It could be simple just like you did in
__hugetlb_cgroup_file_legacy_init().
Thanks.
> + snprintf(cft->name, MAX_CFTYPE_NAME, "%s.numa_stat", buf);
> + cft->seq_show = hugetlb_cgroup_read_numa_stat;
> + cft->flags = CFTYPE_NOT_ON_ROOT;
> +
> + /* Add the events file */
> + cft = &h->cgroup_files_dfl[5];
> snprintf(cft->name, MAX_CFTYPE_NAME, "%s.events", buf);
> cft->private = MEMFILE_PRIVATE(idx, 0);
> cft->seq_show = hugetlb_events_show;
> @@ -663,7 +736,7 @@ static void __init __hugetlb_cgroup_file_dfl_init(int idx)
> cft->flags = CFTYPE_NOT_ON_ROOT;
>
> /* Add the events.local file */
> - cft = &h->cgroup_files_dfl[5];
> + cft = &h->cgroup_files_dfl[6];
> snprintf(cft->name, MAX_CFTYPE_NAME, "%s.events.local", buf);
> cft->private = MEMFILE_PRIVATE(idx, 0);
> cft->seq_show = hugetlb_events_local_show;
> @@ -672,7 +745,7 @@ static void __init __hugetlb_cgroup_file_dfl_init(int idx)
> cft->flags = CFTYPE_NOT_ON_ROOT;
>
> /* NULL terminate the last cft */
> - cft = &h->cgroup_files_dfl[6];
> + cft = &h->cgroup_files_dfl[7];
> memset(cft, 0, sizeof(*cft));
>
> WARN_ON(cgroup_add_dfl_cftypes(&hugetlb_cgrp_subsys,
> @@ -742,8 +815,14 @@ 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,
> diff --git a/tools/testing/selftests/vm/write_to_hugetlbfs.c b/tools/testing/selftests/vm/write_to_hugetlbfs.c
> index 6a2caba19ee1..d2da6315a40c 100644
> --- a/tools/testing/selftests/vm/write_to_hugetlbfs.c
> +++ b/tools/testing/selftests/vm/write_to_hugetlbfs.c
> @@ -37,8 +37,8 @@ static int shmid;
> static void exit_usage(void)
> {
> printf("Usage: %s -p <path to hugetlbfs file> -s <size to map> "
> - "[-m <0=hugetlbfs | 1=mmap(MAP_HUGETLB)>] [-l] [-r] "
> - "[-o] [-w] [-n]\n",
> + "[-m <0=hugetlbfs | 1=mmap(MAP_HUGETLB)>] [-l(sleep)] [-r(private)] "
> + "[-o(populate)] [-w(rite)] [-n(o-reserve)]\n",
> self);
> exit(EXIT_FAILURE);
> }
> @@ -161,6 +161,11 @@ int main(int argc, char **argv)
> else
> printf("RESERVE mapping.\n");
>
> + if (want_sleep)
> + printf("Sleeping\n");
> + else
> + printf("Not sleeping\n");
> +
> switch (method) {
> case HUGETLBFS:
> printf("Allocating using HUGETLBFS.\n");
> --
> 2.33.0.1079.g6e70778dc9-goog
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