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vfs: retire vnlru_under_unlocked

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It only looks at the centralized value which in corner cases can end up
being negative.
This commit is contained in:
Mateusz Guzik 2023-09-14 23:05:51 +00:00
parent f454a4a10d
commit ba5dc166e0
1 changed files with 1 additions and 18 deletions
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19
sys/kern/vfs_subr.c
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@ -1528,23 +1528,6 @@ vnlru_under(u_long rnumvnodes, u_long limit)
return (space < limit);
}
static bool
vnlru_under_unlocked(u_long rnumvnodes, u_long limit)
{
long rfreevnodes, space;
if (__predict_false(rnumvnodes > desiredvnodes))
return (true);
space = desiredvnodes - rnumvnodes;
if (space < limit) {
rfreevnodes = atomic_load_long(&freevnodes);
if (rfreevnodes > wantfreevnodes)
space += rfreevnodes - wantfreevnodes;
}
return (space < limit);
}
static void
vnlru_kick_locked(void)
{
@ -1826,7 +1809,7 @@ vn_alloc(struct mount *mp)
if (__predict_false(vn_alloc_cyclecount != 0))
return (vn_alloc_hard(mp));
rnumvnodes = atomic_fetchadd_long(&numvnodes, 1) + 1;
if (__predict_false(vnlru_under_unlocked(rnumvnodes, vlowat))) {
if (__predict_false(vnlru_under(rnumvnodes, vlowat))) {
atomic_subtract_long(&numvnodes, 1);
return (vn_alloc_hard(mp));
}