git: 8b5eb0cf6c4f - stable/13 - vfs cache: add sysctl vfs.cache.param.hitpct

The branch stable/13 has been updated by mjg:

URL: https://cgit.FreeBSD.org/src/commit/?id=8b5eb0cf6c4f586f891fef7fb067beb343826435

commit 8b5eb0cf6c4f586f891fef7fb067beb343826435
Author:     Mateusz Guzik <mjg@FreeBSD.org>
AuthorDate: 2024-07-08 17:57:39 +0000
Commit:     Mateusz Guzik <mjg@FreeBSD.org>
CommitDate: 2024-07-10 22:06:15 +0000

    vfs cache: add sysctl vfs.cache.param.hitpct
    
    Sponsored by:   Rubicon Communications, LLC ("Netgate")
    
    (cherry picked from commit 0a487207227badcbfbec029103ac7e2d5291bd30)
---
 sys/kern/vfs_cache.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/sys/kern/vfs_cache.c b/sys/kern/vfs_cache.c
index 647d4573563c..aacbd43403e1 100644
--- a/sys/kern/vfs_cache.c
+++ b/sys/kern/vfs_cache.c
@@ -988,6 +988,26 @@ SYSCTL_PROC(_vfs_cache, OID_AUTO, nchstats, CTLTYPE_OPAQUE | CTLFLAG_RD |
     CTLFLAG_MPSAFE, 0, 0, sysctl_nchstats, "LU",
     "VFS cache effectiveness statistics");
 
+static int
+sysctl_hitpct(SYSCTL_HANDLER_ARGS)
+{
+	long poshits, neghits, miss, total;
+	long pct;
+
+	poshits = counter_u64_fetch(numposhits);
+	neghits = counter_u64_fetch(numneghits);
+	miss = counter_u64_fetch(nummiss);
+	total = poshits + neghits + miss;
+
+	pct = 0;
+	if (total != 0)
+		pct = ((poshits + neghits) * 100) / total;
+	return (sysctl_handle_int(oidp, 0, pct, req));
+}
+SYSCTL_PROC(_vfs_cache_stats, OID_AUTO, hitpct,
+    CTLTYPE_INT | CTLFLAG_MPSAFE | CTLFLAG_RD, NULL, 0, sysctl_hitpct,
+    "I", "Percentage of hits");
+
 static void
 cache_recalc_neg_min(void)
 {