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-rw-r--r--target/linux/generic/backport-5.15/020-v6.1-08-mm-multigenerational-lru-user-interface.patch496
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);
generated by cgit v1.2.3 (git 2.25.1) at 2024-10-31 17:10:49 +0000