Gh0st
/
linux
mirror of https://github.com/torvalds/linux.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

mm: vmstat: output reserved_highatomic and free_highatomic in zoneinfo 

The nr_free_highatomic is a key factor in calculating watermarks as it
affects the free pages count.  Adding this metric, along with
nr_reserved_highatomic, to /proc/zoneinfo facilitates easier diagnosis
memory watermark calculations and memory pressure states.

Sample output:
cat /proc/zoneinfo
......
pagesets
cpu: 0
		  count:    52069
		  high:     52675
		  batch:    63
		  high_min: 13971
		  high_max: 62284
vm stats threshold: 10
node_unreclaimable:  0
start_pfn:           4096
reserved_highatomic: 5120
free_highatomic:     2081

Link: https://lkml.kernel.org/r/20251027141818.283587-1-jiayuan.chen@linux.dev
Signed-off-by: Jiayuan Chen <jiayuan.chen@linux.dev>
Cc: David Hildenbrand <david@redhat.com>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Jiayuan Chen 2025-10-27 22:18:17 +08:00 committed by Andrew Morton
parent 272239dc8f
commit 6af766c86b
1 changed files with 6 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
mm/vmstat.c
View File

@ -1852,9 +1852,13 @@ static void zoneinfo_show_print(struct seq_file *m, pg_data_t *pgdat,
}
seq_printf(m,
"\n node_unreclaimable: %u"
"\n start_pfn: %lu",
"\n start_pfn: %lu"
"\n reserved_highatomic: %lu"
"\n free_highatomic: %lu",
atomic_read(&pgdat->kswapd_failures) >= MAX_RECLAIM_RETRIES,
zone->zone_start_pfn);
zone->zone_start_pfn,
zone->nr_reserved_highatomic,
zone->nr_free_highatomic);
seq_putc(m, '\n');
}