linux-kernel - [PATCH 1/9] mm: vmstat: fix stat_threshold for NR_KERNEL_STACK

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Date:   Sun,  6 Dec 2020 16:22:59 +0800
From:   Muchun Song <songmuchun@...edance.com>
To:     gregkh@...uxfoundation.org, rafael@...nel.org, adobriyan@...il.com,
        akpm@...ux-foundation.org, hannes@...xchg.org, mhocko@...nel.org,
        vdavydov.dev@...il.com, hughd@...gle.com, will@...nel.org,
        guro@...com, rppt@...nel.org, tglx@...utronix.de, esyr@...hat.com,
        peterx@...hat.com, krisman@...labora.com, surenb@...gle.com,
        avagin@...nvz.org, elver@...gle.com, rdunlap@...radead.org,
        iamjoonsoo.kim@....com
Cc:     linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-mm@...ck.org, cgroups@...r.kernel.org,
        Muchun Song <songmuchun@...edance.com>
Subject: [PATCH 1/9] mm: vmstat: fix stat_threshold for NR_KERNEL_STACK_KB

The kernel stack is being accounted in KiB not page, so the
stat_threshold should also adjust to byte.

Signed-off-by: Muchun Song <songmuchun@...edance.com>
---
 mm/vmstat.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/mm/vmstat.c b/mm/vmstat.c
index 8d77ee426e22..f7857a7052e4 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -353,6 +353,8 @@ void __mod_node_page_state(struct pglist_data *pgdat, enum node_stat_item item,
 	x = delta + __this_cpu_read(*p);
 
 	t = __this_cpu_read(pcp->stat_threshold);
+	if (unlikely(item == NR_KERNEL_STACK_KB))
+		t <<= PAGE_SHIFT;
 
 	if (unlikely(abs(x) > t)) {
 		node_page_state_add(x, pgdat, item);
@@ -573,6 +575,8 @@ static inline void mod_node_state(struct pglist_data *pgdat,
 		 * for all cpus in a node.
 		 */
 		t = this_cpu_read(pcp->stat_threshold);
+		if (unlikely(item == NR_KERNEL_STACK_KB))
+			t <<= PAGE_SHIFT;
 
 		o = this_cpu_read(*p);
 		n = delta + o;
-- 
2.11.0