[master] 850d1a0 Add a vcl_cooldown parameter which controls when we switch deactivated VCLs to cold (if they're in "auto" mode).

[Poul-Henning Kamp]

commit 850d1a06ca03235f5435a0a9dc60a304176f4046
Author: Poul-Henning Kamp <phk at FreeBSD.org>
Date:   Mon Mar 9 08:41:51 2015 +0000

    Add a vcl_cooldown parameter which controls when we switch deactivated
    VCLs to cold (if they're in "auto" mode).

diff --git a/bin/varnishd/common/params.h b/bin/varnishd/common/params.h
index cdb8646..f5f9450 100644
--- a/bin/varnishd/common/params.h
+++ b/bin/varnishd/common/params.h
@@ -198,6 +198,8 @@ struct params {
 
 	double			critbit_cooloff;
 
+	double			vcl_cooldown;
+
 	double			shortlived;
 
 	struct vre_limits	vre_limits;
diff --git a/bin/varnishd/mgt/mgt_param_tbl.c b/bin/varnishd/mgt/mgt_param_tbl.c
index e57a68f..e705a47 100644
--- a/bin/varnishd/mgt/mgt_param_tbl.c
+++ b/bin/varnishd/mgt/mgt_param_tbl.c
@@ -532,7 +532,12 @@ struct parspec mgt_parspec[] = {
 		0,
 		VARNISH_VMOD_DIR,
 		NULL },
-
+	{ "vcl_cooldown", tweak_timeout, &mgt_param.vcl_cooldown,
+		"0", NULL,
+		"How long time a VCL is kept warm after being replaced as the"
+		" active VCL.  (Granularity approximately 30 seconds.)",
+		0,
+		"600", "seconds" },
 	{ "vcc_err_unref", tweak_bool, &mgt_vcc_err_unref,
 		NULL, NULL,
 		"Unreferenced VCL objects result in error.",