From: Chen Wandun chenwandun@huawei.com
hulk inclusion category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/I545DF CVE: NA
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introduce per-memcg reclaim interface for cgroup v1, and disable memory reclaim for root memcg.
Signed-off-by: Chen Wandun chenwandun@huawei.com Reviewed-by: Kefeng Wang wangkefeng.wang@huawei.com Signed-off-by: Zheng Zengkai zhengzengkai@huawei.com --- mm/memcontrol.c | 87 ++++++++++++++++++++++++++----------------------- 1 file changed, 47 insertions(+), 40 deletions(-)
diff --git a/mm/memcontrol.c b/mm/memcontrol.c index 06cb2c417623..3ede56d6b307 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -5152,6 +5152,49 @@ static int memcg_events_local_show(struct seq_file *m, void *v) return 0; }
+static ssize_t memory_reclaim(struct kernfs_open_file *of, char *buf, + size_t nbytes, loff_t off) +{ + struct mem_cgroup *memcg = mem_cgroup_from_css(of_css(of)); + unsigned int nr_retries = MAX_RECLAIM_RETRIES; + unsigned long nr_to_reclaim, nr_reclaimed = 0; + int err; + + buf = strstrip(buf); + err = page_counter_memparse(buf, "", &nr_to_reclaim); + if (err) + return err; + + if (!cgroup_subsys_on_dfl(memory_cgrp_subsys) && + mem_cgroup_is_root(memcg)) + return -EINVAL; + + while (nr_reclaimed < nr_to_reclaim) { + unsigned long reclaimed; + + if (signal_pending(current)) + return -EINTR; + + /* This is the final attempt, drain percpu lru caches in the + * hope of introducing more evictable pages for + * try_to_free_mem_cgroup_pages(). + */ + if (!nr_retries) + lru_add_drain_all(); + + reclaimed = try_to_free_mem_cgroup_pages(memcg, + nr_to_reclaim - nr_reclaimed, + GFP_KERNEL, true); + + if (!reclaimed && !nr_retries--) + return -EAGAIN; + + nr_reclaimed += reclaimed; + } + + return nbytes; +} + static struct cftype mem_cgroup_legacy_files[] = { { .name = "usage_in_bytes", @@ -5345,6 +5388,10 @@ static struct cftype mem_cgroup_legacy_files[] = { .file_offset = offsetof(struct mem_cgroup, events_local_file), .seq_show = memcg_events_local_show, }, + { + .name = "reclaim", + .write = memory_reclaim, + }, { }, /* terminate */ };
@@ -6711,46 +6758,6 @@ static ssize_t memory_oom_group_write(struct kernfs_open_file *of, return nbytes; }
-static ssize_t memory_reclaim(struct kernfs_open_file *of, char *buf, - size_t nbytes, loff_t off) -{ - struct mem_cgroup *memcg = mem_cgroup_from_css(of_css(of)); - unsigned int nr_retries = MAX_RECLAIM_RETRIES; - unsigned long nr_to_reclaim, nr_reclaimed = 0; - int err; - - buf = strstrip(buf); - err = page_counter_memparse(buf, "", &nr_to_reclaim); - if (err) - return err; - - while (nr_reclaimed < nr_to_reclaim) { - unsigned long reclaimed; - - if (signal_pending(current)) - return -EINTR; - - /* - * This is the final attempt, drain percpu lru caches in the - * hope of introducing more evictable pages for - * try_to_free_mem_cgroup_pages(). - */ - if (!nr_retries) - lru_add_drain_all(); - - reclaimed = try_to_free_mem_cgroup_pages(memcg, - nr_to_reclaim - nr_reclaimed, - GFP_KERNEL, true); - - if (!reclaimed && !nr_retries--) - return -EAGAIN; - - nr_reclaimed += reclaimed; - } - - return nbytes; -} - static struct cftype memory_files[] = { { .name = "current",