[Pmem] Re: [PATCH] anolis: mm: Add page promotion throttle statistic

ANBZ: #80 Add page promotion throttle statistic, which can be used to check how many cold pages were trying to be prmoted to DRAM, and help to tuning the latency threhold.

Signed-off-by: Baolin Wang <baolin.wang(a)linux.alibaba.com> --- include/linux/mmzone.h | 1 + kernel/sched/fair.c | 5 ++++- mm/vmstat.c | 1 + 3 files changed, 6 insertions(+), 1 deletion(-) diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h index d03a536..eecffa7 100644 --- a/include/linux/mmzone.h +++ b/include/linux/mmzone.h @@ -213,6 +213,7 @@ enum node_stat_item { PGPROMOTE_FILE, PGPROMOTE_TRY, /* pages to try to migrate via NUMA balancing */ PGDEMOTED_HOT, + PGPROMOTE_COLD_THROTTLE, #endif NR_VM_NODE_STAT_ITEMS }; diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index c473da4..0a11b03 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -3021,8 +3021,11 @@ bool should_numa_migrate_memory(struct task_struct *p, struct page * page, if (flags & TNF_WRITE) th *= 2; latency = numa_hint_fault_latency(page); - if (latency > th) + if (latency > th) { + mod_node_page_state(pgdat, PGPROMOTE_COLD_THROTTLE, + hpage_nr_pages(page)); return false; + } if (flags & TNF_DEMOTED) mod_node_page_state(pgdat, PGDEMOTED_HOT, diff --git a/mm/vmstat.c b/mm/vmstat.c index 7f2c498..98f2a03 100644 --- a/mm/vmstat.c +++ b/mm/vmstat.c @@ -1193,6 +1193,7 @@ int fragmentation_index(struct zone *zone, unsigned int order) "pgpromote_file", "pgpromote_try", "pgpromote_demoted", + "pgpromote_cold_throttle", #endif /* enum writeback_stat_item counters */