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Date: Thu, 15 Aug 2019 16:21:30 -0700
From: Mina Almasry <almasrymina@...gle.com>
To: Hillf Danton <hdanton@...a.com>
Cc: Mike Kravetz <mike.kravetz@...cle.com>, shuah <shuah@...nel.org>,
David Rientjes <rientjes@...gle.com>,
Shakeel Butt <shakeelb@...gle.com>,
Greg Thelen <gthelen@...gle.com>, akpm@...ux-foundation.org,
khalid.aziz@...cle.com, open list <linux-kernel@...r.kernel.org>,
linux-mm@...ck.org, linux-kselftest@...r.kernel.org
Subject: Re: [RFC PATCH v2 1/5] hugetlb_cgroup: Add hugetlb_cgroup reservation counter
On Wed, Aug 14, 2019 at 8:54 PM Hillf Danton <hdanton@...a.com> wrote:
>
>
> On Thu, 8 Aug 2019 16:13:36 -0700 Mina Almasry wrote:
> >
> > 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.
> > ---
>
> !?!
>
Thanks for reviewing. I'm not sure what you're referring to though.
What's wrong here?
> > 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];
>
> Move that enum in this header file and replace numbers with characters
> to easy both reading and maintaining.
> > #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)
>
> s/get_/hugetlb_cgroup_get_/ to make it not too generic.
> > +{
> > + 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:
> reserved = true;
> /* fall thru */
>
> > 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));
>
> Replace numbers with characters.
> >
> > WARN_ON(cgroup_add_legacy_cftypes(&hugetlb_cgrp_subsys,
> > --
> > 2.23.0.rc1.153.gdeed80330f-goog
>
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