@@ -213,6 +213,7 @@ enum node_stat_item {
#endif
#ifdef CONFIG_NUMA_BALANCING
PGPROMOTE_SUCCESS, /* promote successfully */
+ PGPROMOTE_CANDIDATE, /* candidate pages to promote */
#endif
NR_VM_NODE_STAT_ITEMS
};
@@ -902,6 +903,10 @@ typedef struct pglist_data {
struct deferred_split deferred_split_queue;
#endif
+#ifdef CONFIG_NUMA_BALANCING
+ unsigned long numa_ts;
+ unsigned long numa_nr_candidate;
+#endif
/* Fields commonly accessed by the page reclaim scanner */
/*
@@ -42,6 +42,7 @@ enum sched_tunable_scaling {
#ifdef CONFIG_NUMA_BALANCING
extern int sysctl_numa_balancing_mode;
extern unsigned int sysctl_numa_balancing_hot_threshold;
+extern unsigned int sysctl_numa_balancing_rate_limit;
#else
#define sysctl_numa_balancing_mode 0
#endif
@@ -1028,6 +1028,11 @@ unsigned int sysctl_numa_balancing_scan_delay = 1000;
/* The page with hint page fault latency < threshold in ms is considered hot */
unsigned int sysctl_numa_balancing_hot_threshold = 1000;
+/*
+ * Restrict the NUMA migration per second in MB for each target node
+ * if no enough free space in target node
+ */
+unsigned int sysctl_numa_balancing_rate_limit = 65536;
struct numa_group {
refcount_t refcount;
@@ -1401,6 +1406,23 @@ static int numa_hint_fault_latency(struct page *page)
return (time - last_time) & PAGE_ACCESS_TIME_MASK;
}
+static bool numa_migration_check_rate_limit(struct pglist_data *pgdat,
+ unsigned long rate_limit, int nr)
+{
+ unsigned long nr_candidate;
+ unsigned long now = jiffies, last_ts;
+
+ mod_node_page_state(pgdat, PGPROMOTE_CANDIDATE, nr);
+ nr_candidate = node_page_state(pgdat, PGPROMOTE_CANDIDATE);
+ last_ts = pgdat->numa_ts;
+ if (now > last_ts + HZ &&
+ cmpxchg(&pgdat->numa_ts, last_ts, now) == last_ts)
+ pgdat->numa_nr_candidate = nr_candidate;
+ if (nr_candidate - pgdat->numa_nr_candidate > rate_limit)
+ return false;
+ return true;
+}
+
bool should_numa_migrate_memory(struct task_struct *p, struct page * page,
int src_nid, int dst_cpu)
{
@@ -1415,7 +1437,7 @@ bool should_numa_migrate_memory(struct task_struct *p, struct page * page,
if (sysctl_numa_balancing_mode & NUMA_BALANCING_MEMORY_TIERING &&
!node_is_toptier(src_nid)) {
struct pglist_data *pgdat;
- unsigned long latency, th;
+ unsigned long rate_limit, latency, th;
pgdat = NODE_DATA(dst_nid);
if (pgdat_free_space_enough(pgdat))
@@ -1426,7 +1448,10 @@ bool should_numa_migrate_memory(struct task_struct *p, struct page * page,
if (latency > th)
return false;
- return true;
+ rate_limit =
+ sysctl_numa_balancing_rate_limit << (20 - PAGE_SHIFT);
+ return numa_migration_check_rate_limit(pgdat, rate_limit,
+ thp_nr_pages(page));
}
this_cpupid = cpu_pid_to_cpupid(dst_cpu, current->pid);
@@ -1818,6 +1818,14 @@ static struct ctl_table kern_table[] = {
.mode = 0644,
.proc_handler = proc_dointvec,
},
+ {
+ .procname = "numa_balancing_rate_limit_mbps",
+ .data = &sysctl_numa_balancing_rate_limit,
+ .maxlen = sizeof(unsigned int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = SYSCTL_ZERO,
+ },
#endif /* CONFIG_NUMA_BALANCING */
{
.procname = "sched_rt_period_us",
@@ -1244,6 +1244,7 @@ const char * const vmstat_text[] = {
#endif
#ifdef CONFIG_NUMA_BALANCING
"pgpromote_success",
+ "pgpromote_candidate",
#endif
/* enum writeback_stat_item counters */
In NUMA balancing memory tiering mode, the hot slow memory pages could be promoted to the fast memory node via NUMA balancing. But this incurs some overhead too. So that sometimes the workload performance may be hurt. To avoid too much disturbing to the workload in these situations, we should make it possible to rate limit the promotion throughput. So, in this patch, we implement a simple rate limit algorithm as follows. The number of the candidate pages to be promoted to the fast memory node via NUMA balancing is counted, if the count exceeds the limit specified by the users, the NUMA balancing promotion will be stopped until the next second. A new sysctl knob kernel.numa_balancing_rate_limit_mbps is added for the users to specify the limit. TODO: Add ABI document for new sysctl knob. Signed-off-by: "Huang, Ying" <ying.huang@intel.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Michal Hocko <mhocko@suse.com> Cc: Rik van Riel <riel@surriel.com> Cc: Mel Gorman <mgorman@techsingularity.net> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Yang Shi <shy828301@gmail.com> Cc: Zi Yan <ziy@nvidia.com> Cc: Wei Xu <weixugc@google.com> Cc: osalvador <osalvador@suse.de> Cc: Shakeel Butt <shakeelb@google.com> Cc: Hasan Al Maruf <hasanalmaruf@fb.com> Cc: linux-kernel@vger.kernel.org Cc: linux-mm@kvack.org --- include/linux/mmzone.h | 5 +++++ include/linux/sched/sysctl.h | 1 + kernel/sched/fair.c | 29 +++++++++++++++++++++++++++-- kernel/sysctl.c | 8 ++++++++ mm/vmstat.c | 1 + 5 files changed, 42 insertions(+), 2 deletions(-)