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.
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.page_age_intervals Configures the intervals for the page age histogram. This file operates on a per-node basis, allowing for different intervals for each node. e.g. echo N0=1000,2000,3000,4000,5000 > memory.workingset.page_age_intervals
/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@google.com --- include/linux/memcontrol.h | 5 + include/linux/workingset_report.h | 6 +- mm/internal.h | 2 + mm/memcontrol.c | 267 +++++++++++++++++++++++++++++- mm/workingset_report.c | 10 +- 5 files changed, 286 insertions(+), 4 deletions(-)
diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h index 20ff87f8e001..7d7bc0928961 100644 --- a/include/linux/memcontrol.h +++ b/include/linux/memcontrol.h @@ -335,6 +335,11 @@ struct mem_cgroup { struct lru_gen_mm_list mm_list; #endif
+#ifdef CONFIG_WORKINGSET_REPORT + /* memory.workingset.page_age file */ + struct cgroup_file workingset_page_age_file; +#endif + struct mem_cgroup_per_node *nodeinfo[]; };
diff --git a/include/linux/workingset_report.h b/include/linux/workingset_report.h index 589d240d6251..502542c812b3 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
@@ -38,7 +39,10 @@ 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 36480c7ac0dd..3730c8399ad4 100644 --- a/mm/internal.h +++ b/mm/internal.h @@ -212,6 +212,8 @@ extern void reclaim_throttle(pg_data_t *pgdat, enum vmscan_throttle_state reason void notify_workingset(struct mem_cgroup *memcg, struct pglist_data *pgdat); /* Requires wsr->page_age_lock held */ void wsr_refresh_scan(struct lruvec *lruvec, unsigned long refresh_interval); +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 2f07141de16c..75bda5f7994d 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -7005,6 +7005,245 @@ static ssize_t memory_reclaim(struct kernfs_open_file *of, char *buf, return nbytes; }
+#ifdef CONFIG_WORKINGSET_REPORT +static int memory_ws_page_age_intervals_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; + struct wsr_page_age_histo *page_age; + int i, nr_bins; + + wsr = &mem_cgroup_lruvec(memcg, NODE_DATA(nid))->wsr; + mutex_lock(&wsr->page_age_lock); + page_age = wsr->page_age; + if (!page_age) + goto no_page_age; + seq_printf(m, "N%d=", nid); + nr_bins = page_age->bins.nr_bins; + for (i = 0; i < nr_bins; ++i) { + struct wsr_report_bin *bin = + &page_age->bins.bins[i]; + + seq_printf(m, "%u", jiffies_to_msecs(bin->idle_age)); + if (i + 1 < nr_bins) + seq_putc(m, ','); + } + seq_putc(m, ' '); +no_page_age: + mutex_unlock(&wsr->page_age_lock); + } + seq_putc(m, '\n'); + + return 0; +} + +static ssize_t memory_wsr_interval_parse(struct kernfs_open_file *of, char *buf, + size_t nbytes, unsigned int *nid_out, + struct wsr_report_bins *bins) +{ + char *node, *intervals; + unsigned int nid; + int err; + + buf = strstrip(buf); + intervals = buf; + node = strsep(&intervals, "="); + + 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 = workingset_report_intervals_parse(intervals, bins); + if (err < 0) + return err; + + *nid_out = nid; + return err; +} + +static ssize_t memory_ws_page_age_intervals_write(struct kernfs_open_file *of, + char *buf, size_t nbytes, + loff_t off) +{ + unsigned int nid; + int err; + struct wsr_page_age_histo *page_age = NULL, *old; + struct wsr_state *wsr; + struct mem_cgroup *memcg = mem_cgroup_from_css(of_css(of)); + + page_age = + kzalloc(sizeof(struct wsr_page_age_histo), GFP_KERNEL_ACCOUNT); + + if (!page_age) { + err = -ENOMEM; + goto failed; + } + + err = memory_wsr_interval_parse(of, buf, nbytes, &nid, &page_age->bins); + if (err < 0) + goto failed; + + if (err == 0) { + kfree(page_age); + page_age = NULL; + } + + wsr = &mem_cgroup_lruvec(memcg, NODE_DATA(nid))->wsr; + mutex_lock(&wsr->page_age_lock); + old = xchg(&wsr->page_age, page_age); + mutex_unlock(&wsr->page_age_lock); + kfree(old); + return nbytes; +failed: + kfree(page_age); + return err; +} + +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; + WRITE_ONCE(wsr->refresh_interval, msecs_to_jiffies(msecs)); + 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.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", @@ -7073,7 +7312,33 @@ static struct cftype memory_files[] = { .flags = CFTYPE_NS_DELEGATABLE, .write = memory_reclaim, }, - { } /* terminate */ +#ifdef CONFIG_WORKINGSET_REPORT + { + .name = "workingset.page_age_intervals", + .flags = CFTYPE_NOT_ON_ROOT | CFTYPE_NS_DELEGATABLE, + .seq_show = memory_ws_page_age_intervals_show, + .write = memory_ws_page_age_intervals_write, + }, + { + .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 3ed3b0e8f8ad..b00ffbfebcab 100644 --- a/mm/workingset_report.c +++ b/mm/workingset_report.c @@ -20,9 +20,12 @@ void wsr_init(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 = &memcg->workingset_page_age_file; }
void wsr_destroy(struct lruvec *lruvec) @@ -34,7 +37,7 @@ void wsr_destroy(struct lruvec *lruvec) memset(wsr, 0, sizeof(*wsr)); }
-static int workingset_report_intervals_parse(char *src, +int workingset_report_intervals_parse(char *src, struct wsr_report_bins *bins) { int err = 0, i = 0; @@ -490,5 +493,8 @@ 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); }