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uma: Show the count of free slabs in each per-domain keg's sysctl tree

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This is useful for measuring the number of pages that could be freed
from a NOFREE zone under memory pressure.

Sponsored by:	The FreeBSD Foundation

(cherry picked from commit d6e77cda9b)
This commit is contained in:
Mark Johnston 2021-09-17 12:13:47 -04:00
parent cb7bb946f7
commit e68465ecbf
1 changed files with 4 additions and 1 deletions
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5
sys/vm/uma_core.c
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@ -2526,7 +2526,10 @@ zone_alloc_sysctl(uma_zone_t zone, void *unused)
"Total pages currently allocated from VM");
SYSCTL_ADD_U32(NULL, SYSCTL_CHILDREN(oid), OID_AUTO,
"free_items", CTLFLAG_RD, &dom->ud_free_items, 0,
"items free in the slab layer");
"Items free in the slab layer");
SYSCTL_ADD_U32(NULL, SYSCTL_CHILDREN(oid), OID_AUTO,
"free_slabs", CTLFLAG_RD, &dom->ud_free_slabs, 0,
"Unused slabs");
}
} else
SYSCTL_ADD_CONST_STRING(NULL, SYSCTL_CHILDREN(oid), OID_AUTO,