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uma: report slab efficiency

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Reviewed by:	jeff
Sponsored by:	Dell EMC Isilon
Differential Revision:	https://reviews.freebsd.org/D22766
This commit is contained in:
Ryan Libby 2019-12-13 09:32:09 +00:00
parent 3182660a85
commit f7af501519
1 changed files with 26 additions and 0 deletions
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26
sys/vm/uma_core.c
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@ -290,6 +290,7 @@ static int sysctl_vm_zone_stats(SYSCTL_HANDLER_ARGS);
static int sysctl_handle_uma_zone_allocs(SYSCTL_HANDLER_ARGS);
static int sysctl_handle_uma_zone_frees(SYSCTL_HANDLER_ARGS);
static int sysctl_handle_uma_zone_flags(SYSCTL_HANDLER_ARGS);
static int sysctl_handle_uma_slab_efficiency(SYSCTL_HANDLER_ARGS);
#ifdef INVARIANTS
static inline struct noslabbits *slab_dbg_bits(uma_slab_t slab, uma_keg_t keg);
@ -1948,6 +1949,10 @@ zone_alloc_sysctl(uma_zone_t zone, void *unused)
SYSCTL_ADD_U32(NULL, SYSCTL_CHILDREN(oid), OID_AUTO,
"free", CTLFLAG_RD, &keg->uk_free, 0,
"items free in the slab layer");
SYSCTL_ADD_PROC(NULL, SYSCTL_CHILDREN(oid), OID_AUTO,
"efficiency", CTLFLAG_RD | CTLTYPE_INT | CTLFLAG_MPSAFE,
keg, 0, sysctl_handle_uma_slab_efficiency, "I",
"Slab utilization (100 - internal fragmentation %)");
} else
SYSCTL_ADD_CONST_STRING(NULL, SYSCTL_CHILDREN(oid), OID_AUTO,
"name", CTLFLAG_RD, nokeg, "Keg name");
@ -4440,6 +4445,27 @@ sysctl_handle_uma_zone_flags(SYSCTL_HANDLER_ARGS)
return (error);
}
static int
sysctl_handle_uma_slab_efficiency(SYSCTL_HANDLER_ARGS)
{
uma_keg_t keg = arg1;
int avail, effpct, total;
total = keg->uk_ppera * PAGE_SIZE;
if ((keg->uk_flags & UMA_ZONE_OFFPAGE) != 0)
total += slab_sizeof(SLAB_MAX_SETSIZE);
/*
* We consider the client's requested size and alignment here, not the
* real size determination uk_rsize, because we also adjust the real
* size for internal implementation reasons (max bitset size).
*/
avail = keg->uk_ipers * roundup2(keg->uk_size, keg->uk_align + 1);
if ((keg->uk_flags & UMA_ZONE_PCPU) != 0)
avail *= mp_maxid + 1;
effpct = 100 * avail / total;
return (sysctl_handle_int(oidp, &effpct, 0, req));
}
#ifdef INVARIANTS
static uma_slab_t
uma_dbg_getslab(uma_zone_t zone, void *item)