The patch titled
Subject: vmstat: call fold_vm_zone_numa_events() before show per zone NUMA event
has been added to the -mm mm-unstable branch. Its filename is
vmstat-call-fold_vm_zone_numa_events-before-show-per-zone-numa-event.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/vmstat-call-fold_vm_zone_numa_events-before-show-per-zone-numa-event.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: MengEn Sun <mengensun@xxxxxxxxxxx>
Subject: vmstat: call fold_vm_zone_numa_events() before show per zone NUMA event
Date: Fri, 1 Nov 2024 12:06:38 +0800
Since 5.14-rc1, NUMA events will only be folded from per-CPU statistics to
per zone and global statistics when the user actually needs it.
Currently, the kernel has performs the fold operation when reading
/proc/vmstat, but does not perform the fold operation in /proc/zoneinfo.
This can lead to inaccuracies in the following statistics in zoneinfo:
- numa_hit
- numa_miss
- numa_foreign
- numa_interleave
- numa_local
- numa_other
Therefore, before printing per-zone vm_numa_event when reading
/proc/zoneinfo, we should also perform the fold operation.
Link: https://lkml.kernel.org/r/1730433998-10461-1-git-send-email-mengensun@xxxxxxxxxxx
Fixes: f19298b9516c ("mm/vmstat: convert NUMA statistics to basic NUMA counters")
Signed-off-by: MengEn Sun <mengensun@xxxxxxxxxxx>
Reviewed-by: JinLiang Zheng <alexjlzheng@xxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/vmstat.c | 1 +
1 file changed, 1 insertion(+)
--- a/mm/vmstat.c~vmstat-call-fold_vm_zone_numa_events-before-show-per-zone-numa-event
+++ a/mm/vmstat.c
@@ -1781,6 +1781,7 @@ static void zoneinfo_show_print(struct s
zone_page_state(zone, i));
#ifdef CONFIG_NUMA
+ fold_vm_zone_numa_events(zone);
for (i = 0; i < NR_VM_NUMA_EVENT_ITEMS; i++)
seq_printf(m, "\n %-12s %lu", numa_stat_name(i),
zone_numa_event_state(zone, i));
_
Patches currently in -mm which might be from mengensun@xxxxxxxxxxx are
mm-add-pcp-high_min-high_max-to-proc-zoneinfo.patch
vmstat-call-fold_vm_zone_numa_events-before-show-per-zone-numa-event.patch
