From: Hugh Dickins <hughd@google.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Roman Gushchin <guro@fb.com>,
Johannes Weiner <hannes@cmpxchg.org>,
Michal Hocko <mhocko@kernel.org>,
Vlastimil Babka <vbabka@suse.cz>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: [PATCH 1/4] mm: restore node stat checking in /proc/sys/vm/stat_refresh
Date: Thu, 25 Feb 2021 15:10:09 -0800 (PST) [thread overview]
Message-ID: <alpine.LSU.2.11.2102251502240.13363@eggly.anvils> (raw)
v4.7 52b6f46bc163 ("mm: /proc/sys/vm/stat_refresh to force vmstat update")
introduced vmstat_refresh(), with its vmstat underflow checking; then
v4.8 75ef71840539 ("mm, vmstat: add infrastructure for per-node vmstats")
split NR_VM_NODE_STAT_ITEMS out of NR_VM_ZONE_STAT_ITEMS without updating
vmstat_refresh(): so it has been missing out much of the vmstat underflow
checking ever since. Reinstate it. Thanks to Roman Gushchin <guro@fb.com>
for tangentially pointing this out.
Signed-off-by: Hugh Dickins <hughd@google.com>
---
mm/vmstat.c | 8 ++++++++
1 file changed, 8 insertions(+)
--- 5.12-rc/mm/vmstat.c 2021-02-24 12:03:55.000000000 -0800
+++ vmstat1/mm/vmstat.c 2021-02-25 11:50:36.000000000 -0800
@@ -1857,6 +1857,14 @@ int vmstat_refresh(struct ctl_table *tab
}
}
#endif
+ for (i = 0; i < NR_VM_NODE_STAT_ITEMS; i++) {
+ val = atomic_long_read(&vm_node_stat[i]);
+ if (val < 0) {
+ pr_warn("%s: %s %ld\n",
+ __func__, node_stat_name(i), val);
+ err = -EINVAL;
+ }
+ }
if (err)
return err;
if (write)
next reply other threads:[~2021-02-25 23:11 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-25 23:10 Hugh Dickins [this message]
2021-02-25 23:10 ` [PATCH 1/4] mm: restore node stat checking in /proc/sys/vm/stat_refresh Hugh Dickins
2021-02-25 23:12 ` [PATCH 2/4] mm: no more EINVAL from /proc/sys/vm/stat_refresh Hugh Dickins
2021-02-25 23:12 ` Hugh Dickins
2021-03-01 0:38 ` Roman Gushchin
2021-02-25 23:14 ` [PATCH 3/4] mm: /proc/sys/vm/stat_refresh skip checking known negative stats Hugh Dickins
2021-02-25 23:14 ` Hugh Dickins
2021-03-01 0:53 ` Roman Gushchin
2021-03-01 22:08 ` Hugh Dickins
2021-03-01 22:08 ` Hugh Dickins
2021-03-02 0:34 ` Roman Gushchin
2021-03-02 6:03 ` [PATCH v2 " Hugh Dickins
2021-03-02 6:03 ` Hugh Dickins
2021-03-04 2:25 ` Roman Gushchin
2021-02-25 23:15 ` [PATCH 4/4] mm: /proc//sys/vm/stat_refresh stop checking monotonic numa stats Hugh Dickins
2021-02-25 23:15 ` Hugh Dickins
2021-03-01 0:53 ` Roman Gushchin
2021-03-01 0:37 ` [PATCH 1/4] mm: restore node stat checking in /proc/sys/vm/stat_refresh Roman Gushchin
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