Messages in this thread Patch in this message | | | From | Jiang Liu <> | Subject | [PATCH v6, part3 15/16] mm: report available pages as "MemTotal" for each NUMA node | Date | Sun, 12 May 2013 01:34:48 +0800 |
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As reported by https://bugzilla.kernel.org/show_bug.cgi?id=53501, "MemTotal" from /proc/meminfo means memory pages managed by the buddy system (managed_pages), but "MemTotal" from /sys/.../node/nodex/meminfo means phsical pages present (present_pages) within the NUMA node. There's a difference between managed_pages and present_pages due to bootmem allocator and reserved pages.
And Documentation/filesystems/proc.txt says MemTotal: Total usable ram (i.e. physical ram minus a few reserved bits and the kernel binary code)
So change /sys/.../node/nodex/meminfo to report available pages within the node as "MemTotal".
Signed-off-by: Jiang Liu <jiang.liu@huawei.com> Reported-by: sworddragon2@aol.com Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Mel Gorman <mgorman@suse.de> Cc: Minchan Kim <minchan@kernel.org> Cc: linux-mm@kvack.org Cc: linux-kernel@vger.kernel.org --- mm/page_alloc.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 56b0097..e7a517d 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -2924,9 +2924,13 @@ EXPORT_SYMBOL(si_meminfo); #ifdef CONFIG_NUMA void si_meminfo_node(struct sysinfo *val, int nid) { + int zone_type; /* needs to be signed */ + unsigned long managed_pages = 0; pg_data_t *pgdat = NODE_DATA(nid); - val->totalram = pgdat->node_present_pages; + for (zone_type = 0; zone_type < MAX_NR_ZONES; zone_type++) + managed_pages += pgdat->node_zones[zone_type].managed_pages; + val->totalram = managed_pages; val->freeram = node_page_state(nid, NR_FREE_PAGES); #ifdef CONFIG_HIGHMEM val->totalhigh = pgdat->node_zones[ZONE_HIGHMEM].managed_pages; -- 1.8.1.2
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