git: bd74830ba874 - stable/15 - sched_shim: restore kern.ccpu sysctl

The branch stable/15 has been updated by kib:

URL: https://cgit.FreeBSD.org/src/commit/?id=bd74830ba874956a2d0cfe6691da379d084d8e9e

commit bd74830ba874956a2d0cfe6691da379d084d8e9e
Author:     Konstantin Belousov <kib@FreeBSD.org>
AuthorDate: 2026-01-23 15:15:43 +0000
Commit:     Konstantin Belousov <kib@FreeBSD.org>
CommitDate: 2026-02-11 05:12:37 +0000

    sched_shim: restore kern.ccpu sysctl
    
    (cherry picked from commit ff870b783f098cafd8b938379eada6b8cfe9a4fb)
---
 sys/kern/sched_4bsd.c | 10 ++++++----
 sys/kern/sched_shim.c |  4 ++++
 2 files changed, 10 insertions(+), 4 deletions(-)

diff --git a/sys/kern/sched_4bsd.c b/sys/kern/sched_4bsd.c
index 11baf9d2bdfa..4c24d98173f3 100644
--- a/sys/kern/sched_4bsd.c
+++ b/sys/kern/sched_4bsd.c
@@ -436,10 +436,7 @@ maybe_preempt(struct thread *td)
 #define	loadfactor(loadav)	(2 * (loadav))
 #define	decay_cpu(loadfac, cpu)	(((loadfac) * (cpu)) / ((loadfac) + FSCALE))
 
-/* decay 95% of `ts_pctcpu' in 60 seconds; see CCPU_SHIFT before changing */
-static fixpt_t	ccpu = 0.95122942450071400909 * FSCALE;	/* exp(-1/20) */
-SYSCTL_UINT(_kern_sched_4bsd, OID_AUTO, ccpu, CTLFLAG_RD, &ccpu, 0,
-    "Decay factor used for updating %CPU");
+extern fixpt_t ccpu;
 
 /*
  * If `ccpu' is not equal to `exp(-1/20)' and you still want to use the
@@ -638,6 +635,11 @@ resetpriority_thread(struct thread *td)
 static void
 sched_4bsd_setup(void)
 {
+	/*
+	 * Decay 95% of `ts_pctcpu' in 60 seconds; see CCPU_SHIFT
+	 * before changing.
+	 */
+	ccpu = 0.95122942450071400909 * FSCALE;	/* exp(-1/20) */
 
 	setup_runqs();
 
diff --git a/sys/kern/sched_shim.c b/sys/kern/sched_shim.c
index 816d0b44bb52..f6b1285830fd 100644
--- a/sys/kern/sched_shim.c
+++ b/sys/kern/sched_shim.c
@@ -199,3 +199,7 @@ SYSCTL_PROC(_kern_sched, OID_AUTO, available,
     CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE,
     NULL, 0, sysctl_kern_sched_available, "A",
     "List of available schedulers");
+
+fixpt_t ccpu;
+SYSCTL_UINT(_kern, OID_AUTO, ccpu, CTLFLAG_RD, &ccpu, 0,
+    "Decay factor used for updating %CPU");