git: c1ffb1ffeeac - stable/14 - vfs: count calls to uma_reclaim in vnlru

[Mateusz Guzik]

The branch stable/14 has been updated by mjg:

URL: 
https://cgit.FreeBSD.org/src/commit/?id=c1ffb1ffeeac1b3968bf3eae5195b49e1c33b542

commit c1ffb1ffeeac1b3968bf3eae5195b49e1c33b542
Author:     Mateusz Guzik <m...@freebsd.org>
AuthorDate: 2023-10-11 22:48:03 +0000
Commit:     Mateusz Guzik <m...@freebsd.org>
CommitDate: 2023-10-13 23:41:48 +0000

    vfs: count calls to uma_reclaim in vnlru
    
    (cherry picked from commit bb679b0c49094757f2aef3d8fe46c41dc8192fea)
---
 sys/kern/vfs_subr.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/sys/kern/vfs_subr.c b/sys/kern/vfs_subr.c
index d21ccb4251cd..01585ac9eefd 100644
--- a/sys/kern/vfs_subr.c
+++ b/sys/kern/vfs_subr.c
@@ -1711,6 +1711,10 @@ vnlru_proc_light(void)
        return (true);
 }
 
+static u_long uma_reclaim_calls;
+SYSCTL_ULONG(_vfs_vnode_vnlru, OID_AUTO, uma_reclaim_calls, CTLFLAG_RD | 
CTLFLAG_STATS,
+    &uma_reclaim_calls, 0, "Number of calls to uma_reclaim");
+
 static void
 vnlru_proc(void)
 {
@@ -1801,8 +1805,10 @@ vnlru_proc(void)
                 * this happens.
                 */
                if (onumvnodes + VNLRU_COUNT_SLOP + 1000 > desiredvnodes &&
-                   numvnodes <= desiredvnodes)
+                   numvnodes <= desiredvnodes) {
+                       uma_reclaim_calls++;
                        uma_reclaim(UMA_RECLAIM_DRAIN);
+               }
                if (done == 0) {
                        if (force == 0 || force == 1) {
                                force = 2;