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Mon, 13 Apr 2026 19:51:20 +0800 (CST) Received: from dggpemf200002.china.huawei.com (unknown [7.185.36.244]) by mail.maildlp.com (Postfix) with ESMTPS id CC81E40574; Mon, 13 Apr 2026 19:57:40 +0800 (CST) Received: from huawei.com (10.50.87.109) by dggpemf200002.china.huawei.com (7.185.36.244) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.11; Mon, 13 Apr 2026 19:57:40 +0800 From: Yang Yingliang To: , , , , , , , CC: , , , Subject: [PATCH -next] mm: make sure freeram is smaller than totalram Date: Mon, 13 Apr 2026 19:57:36 +0800 Message-ID: <20260413115736.1237680-1-yangyingliang@huawei.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-Originating-IP: [10.50.87.109] X-ClientProxiedBy: kwepems200002.china.huawei.com (7.221.188.68) To dggpemf200002.china.huawei.com (7.185.36.244) X-Rspamd-Queue-Id: DFB06100007 X-Stat-Signature: 7pf1pequmjun7fuh8bwuab4wupb1rhf1 X-Rspam-User: X-Rspamd-Server: rspam08 X-HE-Tag: 1776081464-172333 X-HE-Meta: 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 SsciOFAE vddp41b5ND/B/n34I2xQoIvVng62kMWPW1DJ/zS3CJyLSRqs8mjR30ib+CcbFzVjmUNnPn3e6kNRCKg9kHJRXcWOK09X2b20zrclrdbYBuFCQmxjI5XpRNPGhQz1KMMMH8BSZJslV4IGa7LqJlNvE6qm8biqA4c+To6zvKyhU93NMGz+cm0YiUKQp9hg4nlAbKfea4gXfBNgTVD+WHZrjCmRFXJN8v/Kgc7yXn3j5SXsMbNtS8j3B1sh6W0mmTYY2dhTZmiZ3yMCnnInZPbEaRiB4OmU7e8KVh0zt Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: The memory stat is not done in real time, it have some gap with real value. In CPU-less NUMA node, the values of MemTotal and MemFree can be nearly equal, the gap may cause MemFree bigger than MemTotal, it leads MemUsed is negative which print as a large positive number. cat /sys/devices/system/node/node17/meminfo Node 17 MemTotal: 4194304 kB Node 17 MemFree: 4195552 kB Node 17 MemUsed: 18446744073709550368 kB Node 17 Active: 52 kB Node 17 Inactive: 320 kB Node 17 Active(anon): 0 kB Node 17 Inactive(anon): 0 kB Node 17 Active(file): 52 kB Node 17 Inactive(file): 320 kB Node 17 Unevictable: 0 kB Node 17 Mlocked: 0 kB Node 17 Dirty: 0 kB Node 17 Writeback: 0 kB Node 17 FilePages: 372 kB Node 17 Mapped: 320 kB Node 17 AnonPages: 0 kB Node 17 Shmem: 0 kB Node 17 KernelStack: 0 kB Node 17 PageTables: 0 kB Node 17 NFS_Unstable: 0 kB Node 17 Bounce: 0 kB Node 17 WritebackTmp: 0 kB Node 17 KReclaimable: 0 kB Node 17 Slab: 0 kB Node 17 SReclaimable: 0 kB Node 17 SUnreclaim: 0 kB Node 17 AnonHugePages: 79872 kB Node 17 ShmemHugePages: 0 kB Node 17 ShmemPmdMapped: 0 kB Node 17 FileHugePages: 0 kB Node 17 FilePmdMapped: 0 kB Node 17 HugePages_Total: 0 Node 17 HugePages_Free: 0 Node 17 HugePages_Surp: 0 To avoid this exception by refreshing vm_stat, when MemFree is bigger than MemTotal. Signed-off-by: Yang Yingliang --- include/linux/vmstat.h | 1 + mm/show_mem.c | 10 ++++++++++ mm/vmstat.c | 15 ++++++++++----- 3 files changed, 21 insertions(+), 5 deletions(-) diff --git a/include/linux/vmstat.h b/include/linux/vmstat.h index 3c9c266cf782..6a7d2f3757b0 100644 --- a/include/linux/vmstat.h +++ b/include/linux/vmstat.h @@ -259,6 +259,7 @@ extern unsigned long node_page_state(struct pglist_data *pgdat, enum node_stat_item item); extern unsigned long node_page_state_pages(struct pglist_data *pgdat, enum node_stat_item item); +extern int refresh_node_page_state(void); extern void fold_vm_numa_events(void); #else #define sum_zone_node_page_state(node, item) global_zone_page_state(item) diff --git a/mm/show_mem.c b/mm/show_mem.c index 43aca5a2ac99..dc8d2b6056d3 100644 --- a/mm/show_mem.c +++ b/mm/show_mem.c @@ -106,6 +106,16 @@ void si_meminfo_node(struct sysinfo *val, int nid) val->totalram = managed_pages; val->sharedram = node_page_state(pgdat, NR_SHMEM); val->freeram = sum_zone_node_page_state(nid, NR_FREE_PAGES); + if (val->freeram > val->totalram) { + int err = refresh_node_page_state(); + if (err) + val->freeram = val->totalram; + else + val->freeram = sum_zone_node_page_state(nid, NR_FREE_PAGES); + + if (val->freeram > val->totalram) + val->freeram = val->totalram; + } val->totalhigh = managed_highpages; val->freehigh = free_highpages; val->mem_unit = PAGE_SIZE; diff --git a/mm/vmstat.c b/mm/vmstat.c index f534972f517d..96a2e03ec83e 100644 --- a/mm/vmstat.c +++ b/mm/vmstat.c @@ -881,6 +881,11 @@ static bool refresh_cpu_vm_stats(bool do_pagesets) return changed; } +static void refresh_vm_stats(struct work_struct *work) +{ + refresh_cpu_vm_stats(true); +} + /* * Fold the data for an offline cpu into the global array. * There cannot be any access by the offline cpu and therefore @@ -1024,6 +1029,11 @@ unsigned long node_page_state(struct pglist_data *pgdat, return node_page_state_pages(pgdat, item); } + +int refresh_node_page_state(void) +{ + return schedule_on_each_cpu(refresh_vm_stats); +} #endif /* @@ -1970,11 +1980,6 @@ static int sysctl_stat_interval __read_mostly = HZ; static int vmstat_late_init_done; #ifdef CONFIG_PROC_FS -static void refresh_vm_stats(struct work_struct *work) -{ - refresh_cpu_vm_stats(true); -} - static int vmstat_refresh(const struct ctl_table *table, int write, void *buffer, size_t *lenp, loff_t *ppos) { -- 2.25.1