Break down the system-wide working set reporting into
per-memcg reports, which aggregages its children hierarchically.
The per-node working set reporting histograms and refresh/report
threshold files are presented as memcg files, showing a report
containing all the nodes.
The per-node page age interval is configurable in sysfs and not
available per-memcg, while the refresh interval and report threshold are
configured per-memcg.
Memcg interface:
/sys/fs/cgroup/.../memory.workingset.page_age
The memcg equivalent of the sysfs workingset page age histogram
breaks down the workingset of this memcg and its children into
page age intervals. Each node is prefixed with a node header and
a newline. Non-proactive direct reclaim on this memcg can also
wake up userspace agents that are waiting on this file.
e.g.
N0
1000 anon=0 file=0
2000 anon=0 file=0
3000 anon=0 file=0
4000 anon=0 file=0
5000 anon=0 file=0
18446744073709551615 anon=0 file=0
/sys/fs/cgroup/.../memory.workingset.refresh_interval
The memcg equivalent of the sysfs refresh interval. A per-node
number of how much time a page age histogram is valid for, in
milliseconds.
e.g.
echo N0=2000 > memory.workingset.refresh_interval
/sys/fs/cgroup/.../memory.workingset.report_threshold
The memcg equivalent of the sysfs report threshold. A per-node
number of how often userspace agent waiting on the page age
histogram can be woken up, in milliseconds.
e.g.
echo N0=1000 > memory.workingset.report_threshold
Signed-off-by: Yuanchu Xie <yuanchu@xxxxxxxxxx>
Change-Id: I6c8a39cddd248c031c85f144787c9044912f3c21
---
include/linux/memcontrol.h | 21 ++++
include/linux/workingset_report.h | 6 +-
mm/internal.h | 2 +
mm/memcontrol.c | 178 +++++++++++++++++++++++++++++-
mm/workingset_report.c | 12 +-
5 files changed, 214 insertions(+), 5 deletions(-)
diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index 0e5bf25d324f..6d67f1072943 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -315,6 +315,11 @@ struct mem_cgroup {
spinlock_t event_list_lock;
#endif /* CONFIG_MEMCG_V1 */
+#ifdef CONFIG_WORKINGSET_REPORT
+ /* memory.workingset.page_age file */
+ struct cgroup_file workingset_page_age_file;
+#endif
+
struct mem_cgroup_per_node *nodeinfo[];
};
@@ -1063,6 +1068,16 @@ static inline void memcg_memory_event_mm(struct mm_struct *mm,
void split_page_memcg(struct page *head, int old_order, int new_order);
+static inline struct cgroup_file *
+mem_cgroup_page_age_file(struct mem_cgroup *memcg)
+{
+#ifdef CONFIG_WORKINGSET_REPORT
+ return &memcg->workingset_page_age_file;
+#else
+ return NULL;
+#endif
+}
+
#else /* CONFIG_MEMCG */
#define MEM_CGROUP_ID_SHIFT 0
@@ -1470,6 +1485,12 @@ void count_memcg_event_mm(struct mm_struct *mm, enum vm_event_item idx)
static inline void split_page_memcg(struct page *head, int old_order, int new_order)
{
}
+
+static inline struct cgroup_file *
+mem_cgroup_page_age_file(struct mem_cgroup *memcg)
+{
+ return NULL;
+}
#endif /* CONFIG_MEMCG */
/*
diff --git a/include/linux/workingset_report.h b/include/linux/workingset_report.h
index 2ec8b927b200..ae412d408037 100644
--- a/include/linux/workingset_report.h
+++ b/include/linux/workingset_report.h
@@ -9,6 +9,7 @@ struct mem_cgroup;
struct pglist_data;
struct node;
struct lruvec;
+struct cgroup_file;
#ifdef CONFIG_WORKINGSET_REPORT
@@ -40,7 +41,10 @@ struct wsr_state {
unsigned long report_threshold;
unsigned long refresh_interval;
- struct kernfs_node *page_age_sys_file;
+ union {
+ struct kernfs_node *page_age_sys_file;
+ struct cgroup_file *page_age_cgroup_file;
+ };
/* breakdown of workingset by page age */
struct mutex page_age_lock;
diff --git a/mm/internal.h b/mm/internal.h
index 19af882c506e..cc54358ed582 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -421,6 +421,8 @@ void set_task_reclaim_state(struct task_struct *task, struct reclaim_state *rs);
* in mm/wsr.c
*/
void notify_workingset(struct mem_cgroup *memcg, struct pglist_data *pgdat);
+int workingset_report_intervals_parse(char *src,
+ struct wsr_report_bins *bins);
#else
static inline void notify_workingset(struct mem_cgroup *memcg,
struct pglist_data *pgdat)
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 5d16fd9d2c3f..56848dc94d48 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -4318,6 +4318,162 @@ static ssize_t memory_reclaim(struct kernfs_open_file *of, char *buf,
return nbytes;
}
+#ifdef CONFIG_WORKINGSET_REPORT
+static int memory_ws_refresh_interval_show(struct seq_file *m, void *v)
+{
+ int nid;
+ struct mem_cgroup *memcg = mem_cgroup_from_seq(m);
+
+ for_each_node_state(nid, N_MEMORY) {
+ struct wsr_state *wsr =
+ &mem_cgroup_lruvec(memcg, NODE_DATA(nid))->wsr;
+
+ seq_printf(m, "N%d=%u ", nid,
+ jiffies_to_msecs(READ_ONCE(wsr->refresh_interval)));
+ }
+ seq_putc(m, '\n');
+
+ return 0;
+}
+
+static ssize_t memory_wsr_threshold_parse(char *buf, size_t nbytes,
+ unsigned int *nid_out,
+ unsigned int *msecs)
+{
+ char *node, *threshold;
+ unsigned int nid;
+ int err;
+
+ buf = strstrip(buf);
+ threshold = buf;
+ node = strsep(&threshold, "=");
+
+ if (*node != 'N')
+ return -EINVAL;
+
+ err = kstrtouint(node + 1, 0, &nid);
+ if (err)
+ return err;
+
+ if (nid >= nr_node_ids || !node_state(nid, N_MEMORY))
+ return -EINVAL;
+
+ err = kstrtouint(threshold, 0, msecs);
+ if (err)
+ return err;
+
+ *nid_out = nid;
+
+ return nbytes;
+}
+
+static ssize_t memory_ws_refresh_interval_write(struct kernfs_open_file *of,
+ char *buf, size_t nbytes,
+ loff_t off)
+{
+ unsigned int nid, msecs;
+ struct wsr_state *wsr;
+ struct mem_cgroup *memcg = mem_cgroup_from_css(of_css(of));
+ ssize_t ret = memory_wsr_threshold_parse(buf, nbytes, &nid, &msecs);
+
+ if (ret < 0)
+ return ret;
+
+ wsr = &mem_cgroup_lruvec(memcg, NODE_DATA(nid))->wsr;
+
+ mutex_lock(&wsr->page_age_lock);
+ if (msecs && !wsr->page_age) {
+ struct wsr_page_age_histo *page_age =
+ kzalloc(sizeof(struct wsr_page_age_histo), GFP_KERNEL);
+
+ if (!page_age) {
+ ret = -ENOMEM;
+ goto unlock;
+ }
+ wsr->page_age = page_age;
+ }
+ if (!msecs && wsr->page_age) {
+ kfree(wsr->page_age);
+ wsr->page_age = NULL;
+ }
+
+ WRITE_ONCE(wsr->refresh_interval, msecs_to_jiffies(msecs));
+unlock:
+ mutex_unlock(&wsr->page_age_lock);
+ return ret;
+}
+
+static int memory_ws_report_threshold_show(struct seq_file *m, void *v)
+{
+ int nid;
+ struct mem_cgroup *memcg = mem_cgroup_from_seq(m);
+
+ for_each_node_state(nid, N_MEMORY) {
+ struct wsr_state *wsr =
+ &mem_cgroup_lruvec(memcg, NODE_DATA(nid))->wsr;
+
+ seq_printf(m, "N%d=%u ", nid,
+ jiffies_to_msecs(READ_ONCE(wsr->report_threshold)));
+ }
+ seq_putc(m, '\n');
+
+ return 0;
+}
+
+static ssize_t memory_ws_report_threshold_write(struct kernfs_open_file *of,
+ char *buf, size_t nbytes,
+ loff_t off)
+{
+ unsigned int nid, msecs;
+ struct wsr_state *wsr;
+ struct mem_cgroup *memcg = mem_cgroup_from_css(of_css(of));
+ ssize_t ret = memory_wsr_threshold_parse(buf, nbytes, &nid, &msecs);
+
+ if (ret < 0)
+ return ret;
+
+ wsr = &mem_cgroup_lruvec(memcg, NODE_DATA(nid))->wsr;
+ WRITE_ONCE(wsr->report_threshold, msecs_to_jiffies(msecs));
+ return ret;
+}
+
+static int memory_ws_page_age_show(struct seq_file *m, void *v)
+{
+ int nid;
+ struct mem_cgroup *memcg = mem_cgroup_from_seq(m);
+
+ for_each_node_state(nid, N_MEMORY) {
+ struct wsr_state *wsr =
+ &mem_cgroup_lruvec(memcg, NODE_DATA(nid))->wsr;
+ struct wsr_report_bin *bin;
+
+ if (!READ_ONCE(wsr->page_age))
+ continue;
+
+ wsr_refresh_report(wsr, memcg, NODE_DATA(nid));
+ mutex_lock(&wsr->page_age_lock);
+ if (!wsr->page_age)
+ goto unlock;
+ seq_printf(m, "N%d\n", nid);
+ for (bin = wsr->page_age->bins;
+ bin->idle_age != WORKINGSET_INTERVAL_MAX; bin++)
+ seq_printf(m, "%u anon=%lu file=%lu\n",
+ jiffies_to_msecs(bin->idle_age),
+ bin->nr_pages[0] * PAGE_SIZE,
+ bin->nr_pages[1] * PAGE_SIZE);
+
+ seq_printf(m, "%lu anon=%lu file=%lu\n", WORKINGSET_INTERVAL_MAX,
+ bin->nr_pages[0] * PAGE_SIZE,
+ bin->nr_pages[1] * PAGE_SIZE);
+
+unlock:
+ mutex_unlock(&wsr->page_age_lock);
+ }
+
+ return 0;
+}
+#endif
+
static struct cftype memory_files[] = {
{
.name = "current",
@@ -4386,7 +4542,27 @@ static struct cftype memory_files[] = {
.flags = CFTYPE_NS_DELEGATABLE,
.write = memory_reclaim,
},
- { } /* terminate */
+#ifdef CONFIG_WORKINGSET_REPORT
+ {
+ .name = "workingset.refresh_interval",
+ .flags = CFTYPE_NOT_ON_ROOT | CFTYPE_NS_DELEGATABLE,
+ .seq_show = memory_ws_refresh_interval_show,
+ .write = memory_ws_refresh_interval_write,
+ },
+ {
+ .name = "workingset.report_threshold",
+ .flags = CFTYPE_NOT_ON_ROOT | CFTYPE_NS_DELEGATABLE,
+ .seq_show = memory_ws_report_threshold_show,
+ .write = memory_ws_report_threshold_write,
+ },
+ {
+ .name = "workingset.page_age",
+ .flags = CFTYPE_NOT_ON_ROOT | CFTYPE_NS_DELEGATABLE,
+ .file_offset = offsetof(struct mem_cgroup, workingset_page_age_file),
+ .seq_show = memory_ws_page_age_show,
+ },
+#endif
+ {} /* terminate */
};
struct cgroup_subsys memory_cgrp_subsys = {
diff --git a/mm/workingset_report.c b/mm/workingset_report.c
index 801ac8e5c1da..333e51e3ee12 100644
--- a/mm/workingset_report.c
+++ b/mm/workingset_report.c
@@ -37,9 +37,12 @@ void wsr_destroy_pgdat(struct pglist_data *pgdat)
void wsr_init_lruvec(struct lruvec *lruvec)
{
struct wsr_state *wsr = &lruvec->wsr;
+ struct mem_cgroup *memcg = lruvec_memcg(lruvec);
memset(wsr, 0, sizeof(*wsr));
mutex_init(&wsr->page_age_lock);
+ if (memcg && !mem_cgroup_is_root(memcg))
+ wsr->page_age_cgroup_file = mem_cgroup_page_age_file(memcg);
}
void wsr_destroy_lruvec(struct lruvec *lruvec)
@@ -51,8 +54,8 @@ void wsr_destroy_lruvec(struct lruvec *lruvec)
memset(wsr, 0, sizeof(*wsr));
}
-static int workingset_report_intervals_parse(char *src,
- struct wsr_report_bins *bins)
+int workingset_report_intervals_parse(char *src,
+ struct wsr_report_bins *bins)
{
int err = 0, i = 0;
char *cur, *next = strim(src);
@@ -542,5 +545,8 @@ void notify_workingset(struct mem_cgroup *memcg, struct pglist_data *pgdat)
{
struct wsr_state *wsr = &mem_cgroup_lruvec(memcg, pgdat)->wsr;
- kernfs_notify(wsr->page_age_sys_file);
+ if (mem_cgroup_is_root(memcg))
+ kernfs_notify(wsr->page_age_sys_file);
+ else
+ cgroup_file_notify(wsr->page_age_cgroup_file);
}
--
2.46.0.76.ge559c4bf1a-goog
