Module Name: src
Committed By: riastradh
Date: Sun Dec 19 12:40:03 UTC 2021
Modified Files:
src/sys/external/bsd/common/linux: linux_rcu.c
Log Message:
linux: Rate-limit RCU GC thread as a cheap experiment.
To generate a diff of this commit:
cvs rdiff -u -r1.5 -r1.6 src/sys/external/bsd/common/linux/linux_rcu.c
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
Modified files:
Index: src/sys/external/bsd/common/linux/linux_rcu.c
diff -u src/sys/external/bsd/common/linux/linux_rcu.c:1.5 src/sys/external/bsd/common/linux/linux_rcu.c:1.6
--- src/sys/external/bsd/common/linux/linux_rcu.c:1.5 Sun Dec 19 12:07:55 2021
+++ src/sys/external/bsd/common/linux/linux_rcu.c Sun Dec 19 12:40:03 2021
@@ -1,4 +1,4 @@
-/* $NetBSD: linux_rcu.c,v 1.5 2021/12/19 12:07:55 riastradh Exp $ */
+/* $NetBSD: linux_rcu.c,v 1.6 2021/12/19 12:40:03 riastradh Exp $ */
/*-
* Copyright (c) 2018 The NetBSD Foundation, Inc.
@@ -30,7 +30,7 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: linux_rcu.c,v 1.5 2021/12/19 12:07:55 riastradh Exp $");
+__KERNEL_RCSID(0, "$NetBSD: linux_rcu.c,v 1.6 2021/12/19 12:40:03 riastradh Exp $");
#include <sys/param.h>
#include <sys/types.h>
@@ -276,6 +276,15 @@ gc_thread(void *cookie)
/* Finished a batch of work. Notify rcu_barrier. */
gc.gen++;
cv_broadcast(&gc.cv);
+
+ /*
+ * Limit ourselves to one batch per tick, in an attempt
+ * to make the batches larger.
+ *
+ * XXX We should maybe also limit the size of each
+ * batch.
+ */
+ (void)kpause("lxrcubat", /*intr*/false, /*timo*/1, &gc.lock);
}
KASSERT(gc.first_callback == NULL);
KASSERT(gc.first_kfree == NULL);
