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Make ufs_dirhashreclaimperc a percentage for real and

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rename it to ufs_dirhashreclaimpercent, as suggested
by jhb@. As an added bonus this avoids divide-by-zero
errors.

Requested by:	jhb, markj
Reviewied by:	jhb, markj
This commit is contained in:
Davide Italiano 2014-11-22 00:37:37 +00:00
parent fb90c28e23
commit c38b12220f
1 changed files with 26 additions and 5 deletions
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31
sys/ufs/ufs/ufs_dirhash.c
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@ -85,10 +85,11 @@ SYSCTL_INT(_vfs_ufs, OID_AUTO, dirhash_docheck, CTLFLAG_RW, &ufs_dirhashcheck,
static int ufs_dirhashlowmemcount = 0;
SYSCTL_INT(_vfs_ufs, OID_AUTO, dirhash_lowmemcount, CTLFLAG_RD,
&ufs_dirhashlowmemcount, 0, "number of times low memory hook called");
static int ufs_dirhash_reclaimperc = 10;
SYSCTL_INT(_vfs_ufs, OID_AUTO, dirhash_reclaimperc, CTLFLAG_RW,
&ufs_dirhash_reclaimperc, 0,
"percentage of dirhash cache to be removed in low VM events");
static int ufs_dirhashreclaimpercent = 10;
static int ufsdirhash_set_reclaimpercent(SYSCTL_HANDLER_ARGS);
SYSCTL_PROC(_vfs_ufs, OID_AUTO, dirhash_reclaimpercent,
CTLTYPE_INT | CTLFLAG_RW, 0, 0, ufsdirhash_set_reclaimpercent, "I",
"set percentage of dirhash cache to be removed in low VM events");
static int ufsdirhash_hash(struct dirhash *dh, char *name, int namelen);
@ -1251,7 +1252,7 @@ ufsdirhash_lowmem()
ufs_dirhashlowmemcount++;
memfreed = 0;
memwanted = ufs_dirhashmem / ufs_dirhash_reclaimperc;
memwanted = ufs_dirhashmem * ufs_dirhash_reclaimpercent / 100;
DIRHASHLIST_LOCK();
@ -1273,6 +1274,26 @@ ufsdirhash_lowmem()
DIRHASHLIST_UNLOCK();
}
static int
ufsdirhash_set_reclaimpercent(SYSCTL_HANDLER_ARGS)
{
int error, v;
v = ufs_dirhashreclaimpercent;
error = sysctl_handle_int(oidp, &v, v, req);
if (error)
return (error);
if (req->newptr == NULL)
return (error);
if (v == ufs_dirhashreclaimpercent)
return (0);
/* Refuse invalid percentages */
if (v < 0 || v > 100)
return (EINVAL);
ufs_dirhashreclaimpercent = v;
return (0);
}
void
ufsdirhash_init()