Commit 0c83e7fa authored by Thadeu Lima de Souza Cascardo's avatar Thadeu Lima de Souza Cascardo Committed by Andrew Morton
Browse files

mm: show_mem: show number of zspages in show_free_areas 

When OOM is triggered, it will show where the pages might be for each
zone.  When using zram or zswap, it might look like lots of pages are
missing.  After this patch, zspages are shown as below.

[   48.792859] Node 0 DMA free:2812kB boost:0kB min:60kB low:72kB high:84kB reserved_highatomic:0KB free_highatomic:0KB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB writepending:0kB zspages:11160kB present:15992kB managed:15360kB mlocked:0kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB
[   48.792962] lowmem_reserve[]: 0 956 956 956 956
[   48.792988] Node 0 DMA32 free:3512kB boost:0kB min:3912kB low:4888kB high:5864kB reserved_highatomic:0KB free_highatomic:0KB active_anon:0kB inactive_anon:28kB active_file:8kB inactive_file:16kB unevictable:0kB writepending:0kB zspages:916780kB present:1032064kB managed:978944kB mlocked:0kB bounce:0kB free_pcp:500kB local_pcp:248kB free_cma:0kB
[   48.793118] lowmem_reserve[]: 0 0 0 0 0

Link: https://lkml.kernel.org/r/20250902-show_mem_zspages-v2-1-545daaa8b410@igalia.com


Signed-off-by: default avatarThadeu Lima de Souza Cascardo <cascardo@igalia.com>
Reviewed-by: default avatarLorenzo Stoakes <lorenzo.stoakes@oracle.com>
Acked-by: default avatarVlastimil Babka <vbabka@suse.cz>
Acked-by: default avatarZi Yan <ziy@nvidia.com>
Acked-by: default avatarSeongJae Park <sj@kernel.org>
Reviewed-by: default avatarChengming Zhou <chengming.zhou@linux.dev>
Reviewed-by: default avatarSergey Senozhatsky <senozhatsky@chromium.org>
Acked-by: default avatarJohannes Weiner <hannes@cmpxchg.org>
Acked-by: default avatarNhat Pham <nphamcs@gmail.com>
Cc: Brendan Jackman <jackmanb@google.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
parent 2a8f3f44

mm/show_mem.c

+6 −0
Original line number Diff line number Diff line
@@ -310,6 +310,7 @@ static void show_free_areas(unsigned int filter, nodemask_t *nodemask, int max_z 
			" inactive_file:%lukB"

			" unevictable:%lukB"

			" writepending:%lukB"

			" zspages:%lukB"

			" present:%lukB"

			" managed:%lukB"

			" mlocked:%lukB"
@@ -332,6 +333,11 @@ static void show_free_areas(unsigned int filter, nodemask_t *nodemask, int max_z 
			K(zone_page_state(zone, NR_ZONE_INACTIVE_FILE)),

			K(zone_page_state(zone, NR_ZONE_UNEVICTABLE)),

			K(zone_page_state(zone, NR_ZONE_WRITE_PENDING)),

#if IS_ENABLED(CONFIG_ZSMALLOC)

			K(zone_page_state(zone, NR_ZSPAGES)),

#else

			0UL,

#endif

			K(zone->present_pages),

			K(zone_managed_pages(zone)),

			K(zone_page_state(zone, NR_MLOCK)),