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Revert commit 8733bc277a

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Author: Mateusz Guzik <mjg@FreeBSD.org>
Date:   Thu Sep 14 16:13:01 2023 +0000

    vfs: don't provoke recycling non-free vnodes without a good reason

    If the total number of free vnodes is at or above target, there is no
    point creating more of them.

This commit was done as a performance optimization but ends up
causing slowdowns when doing operations on many files.

Requested by:   re (cperciva)
MFC after:      1 minute
This commit is contained in:
Kirk McKusick 2024-11-13 11:37:14 -08:00
parent 46f02c4282
commit ab05a1cf32
1 changed files with 4 additions and 18 deletions
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22
sys/kern/vfs_subr.c
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@ -1992,25 +1992,11 @@ vn_alloc_hard(struct mount *mp, u_long rnumvnodes, bool bumped)
mtx_lock(&vnode_list_mtx);
if (vn_alloc_cyclecount != 0) {
rnumvnodes = atomic_load_long(&numvnodes);
if (rnumvnodes + 1 < desiredvnodes) {
vn_alloc_cyclecount = 0;
mtx_unlock(&vnode_list_mtx);
goto alloc;
}
rfreevnodes = vnlru_read_freevnodes();
if (rfreevnodes < wantfreevnodes) {
if (vn_alloc_cyclecount++ >= rfreevnodes) {
vn_alloc_cyclecount = 0;
vstir = true;
}
} else {
vn_alloc_cyclecount = 0;
}
rfreevnodes = vnlru_read_freevnodes();
if (vn_alloc_cyclecount++ >= rfreevnodes) {
vn_alloc_cyclecount = 0;
vstir = true;
}
/*
* Grow the vnode cache if it will not be above its target max after
* growing. Otherwise, if there is at least one free vnode, try to