diff options
Diffstat (limited to 'target/linux/generic/backport-5.15/020-v6.1-08-mm-multigenerational-lru-user-interface.patch')
-rw-r--r-- | target/linux/generic/backport-5.15/020-v6.1-08-mm-multigenerational-lru-user-interface.patch | 496 |
1 files changed, 0 insertions, 496 deletions
diff --git a/target/linux/generic/backport-5.15/020-v6.1-08-mm-multigenerational-lru-user-interface.patch b/target/linux/generic/backport-5.15/020-v6.1-08-mm-multigenerational-lru-user-interface.patch deleted file mode 100644 index f0753ea802..0000000000 --- a/target/linux/generic/backport-5.15/020-v6.1-08-mm-multigenerational-lru-user-interface.patch +++ /dev/null @@ -1,496 +0,0 @@ -From 5cc7fdec54e87e32b4fb0f07d84b21769d5f8d92 Mon Sep 17 00:00:00 2001 -From: Yu Zhao <yuzhao@google.com> -Date: Mon, 25 Jan 2021 21:38:02 -0700 -Subject: [PATCH 08/10] mm: multigenerational lru: user interface - -Add /sys/kernel/mm/lru_gen/enabled to enable and disable the -multigenerational lru at runtime. - -Add /sys/kernel/mm/lru_gen/min_ttl_ms to protect the working set of a -given number of milliseconds. The OOM killer is invoked if this -working set cannot be kept in memory. - -Add /sys/kernel/debug/lru_gen to monitor the multigenerational lru and -invoke the aging and the eviction. This file has the following output: - memcg memcg_id memcg_path - node node_id - min_gen birth_time anon_size file_size - ... - max_gen birth_time anon_size file_size - -min_gen is the oldest generation number and max_gen is the youngest -generation number. birth_time is in milliseconds. anon_size and -file_size are in pages. - -This file takes the following input: - + memcg_id node_id max_gen [swappiness] [use_bloom_filter] - - memcg_id node_id min_gen [swappiness] [nr_to_reclaim] - -The first command line invokes the aging, which scans PTEs for -accessed pages and then creates the next generation max_gen+1. A swap -file and a non-zero swappiness, which overrides vm.swappiness, are -required to scan PTEs mapping anon pages. The second command line -invokes the eviction, which evicts generations less than or equal to -min_gen. min_gen should be less than max_gen-1 as max_gen and -max_gen-1 are not fully aged and therefore cannot be evicted. -Setting nr_to_reclaim to N limits the number of pages to evict. -Setting use_bloom_filter to 0 overrides the default behavior which -only scans PTE tables found populated. Multiple command lines are -supported, as is concatenation with delimiters "," and ";". - -Signed-off-by: Yu Zhao <yuzhao@google.com> -Tested-by: Konstantin Kharlamov <Hi-Angel@yandex.ru> -Change-Id: I4448e60029badbe347aa3b624f429b280cc3a3d3 ---- - include/linux/nodemask.h | 1 + - mm/vmscan.c | 415 +++++++++++++++++++++++++++++++++++++++ - 2 files changed, 416 insertions(+) - ---- a/include/linux/nodemask.h -+++ b/include/linux/nodemask.h -@@ -485,6 +485,7 @@ static inline int num_node_state(enum no - #define first_online_node 0 - #define first_memory_node 0 - #define next_online_node(nid) (MAX_NUMNODES) -+#define next_memory_node(nid) (MAX_NUMNODES) - #define nr_node_ids 1U - #define nr_online_nodes 1U - ---- a/mm/vmscan.c -+++ b/mm/vmscan.c -@@ -53,6 +53,8 @@ - #include <linux/memory.h> - #include <linux/pagewalk.h> - #include <linux/shmem_fs.h> -+#include <linux/ctype.h> -+#include <linux/debugfs.h> - - #include <asm/tlbflush.h> - #include <asm/div64.h> -@@ -4817,6 +4819,413 @@ unlock: - } - - /****************************************************************************** -+ * sysfs interface -+ ******************************************************************************/ -+ -+static ssize_t show_min_ttl(struct kobject *kobj, struct kobj_attribute *attr, char *buf) -+{ -+ return sprintf(buf, "%u\n", jiffies_to_msecs(READ_ONCE(lru_gen_min_ttl))); -+} -+ -+static ssize_t store_min_ttl(struct kobject *kobj, struct kobj_attribute *attr, -+ const char *buf, size_t len) -+{ -+ unsigned int msecs; -+ -+ if (kstrtouint(buf, 10, &msecs)) -+ return -EINVAL; -+ -+ WRITE_ONCE(lru_gen_min_ttl, msecs_to_jiffies(msecs)); -+ -+ return len; -+} -+ -+static struct kobj_attribute lru_gen_min_ttl_attr = __ATTR( -+ min_ttl_ms, 0644, show_min_ttl, store_min_ttl -+); -+ -+static ssize_t show_enable(struct kobject *kobj, struct kobj_attribute *attr, char *buf) -+{ -+ return snprintf(buf, PAGE_SIZE, "%d\n", lru_gen_enabled()); -+} -+ -+static ssize_t store_enable(struct kobject *kobj, struct kobj_attribute *attr, -+ const char *buf, size_t len) -+{ -+ bool enable; -+ -+ if (kstrtobool(buf, &enable)) -+ return -EINVAL; -+ -+ lru_gen_change_state(enable, true, false); -+ -+ return len; -+} -+ -+static struct kobj_attribute lru_gen_enabled_attr = __ATTR( -+ enabled, 0644, show_enable, store_enable -+); -+ -+static struct attribute *lru_gen_attrs[] = { -+ &lru_gen_min_ttl_attr.attr, -+ &lru_gen_enabled_attr.attr, -+ NULL -+}; -+ -+static struct attribute_group lru_gen_attr_group = { -+ .name = "lru_gen", -+ .attrs = lru_gen_attrs, -+}; -+ -+/****************************************************************************** -+ * debugfs interface -+ ******************************************************************************/ -+ -+static void *lru_gen_seq_start(struct seq_file *m, loff_t *pos) -+{ -+ struct mem_cgroup *memcg; -+ loff_t nr_to_skip = *pos; -+ -+ m->private = kvmalloc(PATH_MAX, GFP_KERNEL); -+ if (!m->private) -+ return ERR_PTR(-ENOMEM); -+ -+ memcg = mem_cgroup_iter(NULL, NULL, NULL); -+ do { -+ int nid; -+ -+ for_each_node_state(nid, N_MEMORY) { -+ if (!nr_to_skip--) -+ return get_lruvec(nid, memcg); -+ } -+ } while ((memcg = mem_cgroup_iter(NULL, memcg, NULL))); -+ -+ return NULL; -+} -+ -+static void lru_gen_seq_stop(struct seq_file *m, void *v) -+{ -+ if (!IS_ERR_OR_NULL(v)) -+ mem_cgroup_iter_break(NULL, lruvec_memcg(v)); -+ -+ kvfree(m->private); -+ m->private = NULL; -+} -+ -+static void *lru_gen_seq_next(struct seq_file *m, void *v, loff_t *pos) -+{ -+ int nid = lruvec_pgdat(v)->node_id; -+ struct mem_cgroup *memcg = lruvec_memcg(v); -+ -+ ++*pos; -+ -+ nid = next_memory_node(nid); -+ if (nid == MAX_NUMNODES) { -+ memcg = mem_cgroup_iter(NULL, memcg, NULL); -+ if (!memcg) -+ return NULL; -+ -+ nid = first_memory_node; -+ } -+ -+ return get_lruvec(nid, memcg); -+} -+ -+static void lru_gen_seq_show_full(struct seq_file *m, struct lruvec *lruvec, -+ unsigned long max_seq, unsigned long *min_seq, -+ unsigned long seq) -+{ -+ int i; -+ int type, tier; -+ int hist = lru_hist_from_seq(seq); -+ struct lrugen *lrugen = &lruvec->evictable; -+ -+ for (tier = 0; tier < MAX_NR_TIERS; tier++) { -+ seq_printf(m, " %10d", tier); -+ for (type = 0; type < ANON_AND_FILE; type++) { -+ unsigned long n[3] = {}; -+ -+ if (seq == max_seq) { -+ n[0] = READ_ONCE(lrugen->avg_refaulted[type][tier]); -+ n[1] = READ_ONCE(lrugen->avg_total[type][tier]); -+ -+ seq_printf(m, " %10luR %10luT %10lu ", n[0], n[1], n[2]); -+ } else if (seq == min_seq[type] || NR_HIST_GENS > 1) { -+ n[0] = atomic_long_read(&lrugen->refaulted[hist][type][tier]); -+ n[1] = atomic_long_read(&lrugen->evicted[hist][type][tier]); -+ if (tier) -+ n[2] = READ_ONCE(lrugen->protected[hist][type][tier - 1]); -+ -+ seq_printf(m, " %10lur %10lue %10lup", n[0], n[1], n[2]); -+ } else -+ seq_puts(m, " 0 0 0 "); -+ } -+ seq_putc(m, '\n'); -+ } -+ -+ seq_puts(m, " "); -+ for (i = 0; i < NR_MM_STATS; i++) { -+ if (seq == max_seq && NR_HIST_GENS == 1) -+ seq_printf(m, " %10lu%c", READ_ONCE(lruvec->mm_walk.stats[hist][i]), -+ toupper(MM_STAT_CODES[i])); -+ else if (seq != max_seq && NR_HIST_GENS > 1) -+ seq_printf(m, " %10lu%c", READ_ONCE(lruvec->mm_walk.stats[hist][i]), -+ MM_STAT_CODES[i]); -+ else -+ seq_puts(m, " 0 "); -+ } -+ seq_putc(m, '\n'); -+} -+ -+static int lru_gen_seq_show(struct seq_file *m, void *v) -+{ -+ unsigned long seq; -+ bool full = !debugfs_real_fops(m->file)->write; -+ struct lruvec *lruvec = v; -+ struct lrugen *lrugen = &lruvec->evictable; -+ int nid = lruvec_pgdat(lruvec)->node_id; -+ struct mem_cgroup *memcg = lruvec_memcg(lruvec); -+ DEFINE_MAX_SEQ(lruvec); -+ DEFINE_MIN_SEQ(lruvec); -+ -+ if (nid == first_memory_node) { -+ const char *path = memcg ? m->private : ""; -+ -+#ifdef CONFIG_MEMCG -+ if (memcg) -+ cgroup_path(memcg->css.cgroup, m->private, PATH_MAX); -+#endif -+ seq_printf(m, "memcg %5hu %s\n", mem_cgroup_id(memcg), path); -+ } -+ -+ seq_printf(m, " node %5d\n", nid); -+ -+ if (!full) -+ seq = min_seq[0]; -+ else if (max_seq >= MAX_NR_GENS) -+ seq = max_seq - MAX_NR_GENS + 1; -+ else -+ seq = 0; -+ -+ for (; seq <= max_seq; seq++) { -+ int gen, type, zone; -+ unsigned int msecs; -+ -+ gen = lru_gen_from_seq(seq); -+ msecs = jiffies_to_msecs(jiffies - READ_ONCE(lrugen->timestamps[gen])); -+ -+ seq_printf(m, " %10lu %10u", seq, msecs); -+ -+ for (type = 0; type < ANON_AND_FILE; type++) { -+ long size = 0; -+ -+ if (seq < min_seq[type]) { -+ seq_puts(m, " -0 "); -+ continue; -+ } -+ -+ for (zone = 0; zone < MAX_NR_ZONES; zone++) -+ size += READ_ONCE(lrugen->sizes[gen][type][zone]); -+ -+ seq_printf(m, " %10lu ", max(size, 0L)); -+ } -+ -+ seq_putc(m, '\n'); -+ -+ if (full) -+ lru_gen_seq_show_full(m, lruvec, max_seq, min_seq, seq); -+ } -+ -+ return 0; -+} -+ -+static const struct seq_operations lru_gen_seq_ops = { -+ .start = lru_gen_seq_start, -+ .stop = lru_gen_seq_stop, -+ .next = lru_gen_seq_next, -+ .show = lru_gen_seq_show, -+}; -+ -+static int run_aging(struct lruvec *lruvec, struct scan_control *sc, int swappiness, -+ unsigned long seq, bool use_filter) -+{ -+ DEFINE_MAX_SEQ(lruvec); -+ -+ if (seq == max_seq) -+ try_to_inc_max_seq(lruvec, sc, swappiness, max_seq, use_filter); -+ -+ return seq > max_seq ? -EINVAL : 0; -+} -+ -+static int run_eviction(struct lruvec *lruvec, struct scan_control *sc, int swappiness, -+ unsigned long seq, unsigned long nr_to_reclaim) -+{ -+ struct blk_plug plug; -+ int err = -EINTR; -+ DEFINE_MAX_SEQ(lruvec); -+ -+ if (seq >= max_seq - 1) -+ return -EINVAL; -+ -+ sc->nr_reclaimed = 0; -+ -+ blk_start_plug(&plug); -+ -+ while (!signal_pending(current)) { -+ DEFINE_MIN_SEQ(lruvec); -+ -+ if (seq < min_seq[!swappiness] || sc->nr_reclaimed >= nr_to_reclaim || -+ !evict_pages(lruvec, sc, swappiness)) { -+ err = 0; -+ break; -+ } -+ -+ cond_resched(); -+ } -+ -+ blk_finish_plug(&plug); -+ -+ return err; -+} -+ -+static int run_cmd(char cmd, int memcg_id, int nid, struct scan_control *sc, -+ int swappiness, unsigned long seq, unsigned long opt) -+{ -+ struct lruvec *lruvec; -+ int err = -EINVAL; -+ struct mem_cgroup *memcg = NULL; -+ -+ if (!mem_cgroup_disabled()) { -+ rcu_read_lock(); -+ memcg = mem_cgroup_from_id(memcg_id); -+#ifdef CONFIG_MEMCG -+ if (memcg && !css_tryget(&memcg->css)) -+ memcg = NULL; -+#endif -+ rcu_read_unlock(); -+ -+ if (!memcg) -+ goto done; -+ } -+ if (memcg_id != mem_cgroup_id(memcg)) -+ goto done; -+ -+ if (nid < 0 || nid >= MAX_NUMNODES || !node_state(nid, N_MEMORY)) -+ goto done; -+ -+ lruvec = get_lruvec(nid, memcg); -+ -+ if (swappiness < 0) -+ swappiness = get_swappiness(memcg); -+ else if (swappiness > 200) -+ goto done; -+ -+ switch (cmd) { -+ case '+': -+ err = run_aging(lruvec, sc, swappiness, seq, opt); -+ break; -+ case '-': -+ err = run_eviction(lruvec, sc, swappiness, seq, opt); -+ break; -+ } -+done: -+ mem_cgroup_put(memcg); -+ -+ return err; -+} -+ -+static ssize_t lru_gen_seq_write(struct file *file, const char __user *src, -+ size_t len, loff_t *pos) -+{ -+ void *buf; -+ char *cur, *next; -+ unsigned int flags; -+ int err = 0; -+ struct scan_control sc = { -+ .may_writepage = 1, -+ .may_unmap = 1, -+ .may_swap = 1, -+ .reclaim_idx = MAX_NR_ZONES - 1, -+ .gfp_mask = GFP_KERNEL, -+ }; -+ -+ buf = kvmalloc(len + 1, GFP_KERNEL); -+ if (!buf) -+ return -ENOMEM; -+ -+ if (copy_from_user(buf, src, len)) { -+ kvfree(buf); -+ return -EFAULT; -+ } -+ -+ next = buf; -+ next[len] = '\0'; -+ -+ sc.reclaim_state.mm_walk_args = alloc_mm_walk_args(); -+ if (!sc.reclaim_state.mm_walk_args) { -+ kvfree(buf); -+ return -ENOMEM; -+ } -+ -+ flags = memalloc_noreclaim_save(); -+ set_task_reclaim_state(current, &sc.reclaim_state); -+ -+ while ((cur = strsep(&next, ",;\n"))) { -+ int n; -+ int end; -+ char cmd; -+ unsigned int memcg_id; -+ unsigned int nid; -+ unsigned long seq; -+ unsigned int swappiness = -1; -+ unsigned long opt = -1; -+ -+ cur = skip_spaces(cur); -+ if (!*cur) -+ continue; -+ -+ n = sscanf(cur, "%c %u %u %lu %n %u %n %lu %n", &cmd, &memcg_id, &nid, -+ &seq, &end, &swappiness, &end, &opt, &end); -+ if (n < 4 || cur[end]) { -+ err = -EINVAL; -+ break; -+ } -+ -+ err = run_cmd(cmd, memcg_id, nid, &sc, swappiness, seq, opt); -+ if (err) -+ break; -+ } -+ -+ set_task_reclaim_state(current, NULL); -+ memalloc_noreclaim_restore(flags); -+ -+ free_mm_walk_args(sc.reclaim_state.mm_walk_args); -+ kvfree(buf); -+ -+ return err ? : len; -+} -+ -+static int lru_gen_seq_open(struct inode *inode, struct file *file) -+{ -+ return seq_open(file, &lru_gen_seq_ops); -+} -+ -+static const struct file_operations lru_gen_rw_fops = { -+ .open = lru_gen_seq_open, -+ .read = seq_read, -+ .write = lru_gen_seq_write, -+ .llseek = seq_lseek, -+ .release = seq_release, -+}; -+ -+static const struct file_operations lru_gen_ro_fops = { -+ .open = lru_gen_seq_open, -+ .read = seq_read, -+ .llseek = seq_lseek, -+ .release = seq_release, -+}; -+ -+/****************************************************************************** - * initialization - ******************************************************************************/ - -@@ -4886,6 +5295,12 @@ static int __init init_lru_gen(void) - BUILD_BUG_ON(BIT(LRU_GEN_WIDTH) <= MAX_NR_GENS); - BUILD_BUG_ON(sizeof(MM_STAT_CODES) != NR_MM_STATS + 1); - -+ if (sysfs_create_group(mm_kobj, &lru_gen_attr_group)) -+ pr_err("lru_gen: failed to create sysfs group\n"); -+ -+ debugfs_create_file("lru_gen", 0644, NULL, NULL, &lru_gen_rw_fops); -+ debugfs_create_file("lru_gen_full", 0444, NULL, NULL, &lru_gen_ro_fops); -+ - return 0; - }; - late_initcall(init_lru_gen); |