Start sharing vsmw_clusters for static backends in same VCL.

bin/varnishd/cache/cache_vrt.c

@@ -42,6 +42,9 @@
 #include "vtcp.h"
 #include "vtim.h"
 
+#include "common/heritage.h"
+#include "common/vsmw.h"
+
 const void * const vrt_magic_string_end = &vrt_magic_string_end;
 const void * const vrt_magic_string_unset = &vrt_magic_string_unset;
 
@@ -628,10 +631,17 @@ VRT_purge(VRT_CTX, double ttl, double grace, double keep)
 struct vsmw_cluster * v_matchproto_()
 VRT_VSM_Cluster_New(VRT_CTX, size_t sz)
 {
+	struct vsmw_cluster *vc;
 
 	CHECK_OBJ_NOTNULL(ctx, VRT_CTX_MAGIC);
-	AN(sz);
-	return ((void*)VRT_VSM_Cluster_New);
+	assert(sz > 0);
+	AN(vsc_lock);
+	AN(vsc_unlock);
+	AN(heritage.proc_vsmw);
+	vsc_lock();
+	vc = VSMW_NewCluster(heritage.proc_vsmw, sz, "VSC_cluster");
+	vsc_unlock();
+	return (vc);
 }
 
 void v_matchproto_()

bin/varnishd/common/common_vsmw.c

@@ -75,6 +75,7 @@ struct vsmw_cluster {
 	char				*fn;
 	size_t				len;
 	void				*ptr;
+	size_t				next;
 	int				refs;
 };
 
@@ -239,12 +240,15 @@ VSMW_Allocv(struct vsmw *vsmw, struct vsmw_cluster *vc,
 	AZ(VSB_finish(vsmw->vsb));
 	REPLACE(seg->id, VSB_data(vsmw->vsb));
 
-	vc = VSMW_NewCluster(vsmw, 64 + len, class);
+	if (vc == NULL)
+		vc = VSMW_NewCluster(vsmw, len, class);
 	AN(vc);
 	vc->refs++;
 
 	seg->cluster = vc;
-	seg->off = 64;
+	seg->off = vc->next;
+	vc->next += len;
+	assert(vc->next <= vc->len);
 	seg->ptr = seg->off + (char*)vc->ptr;
 
 	VTAILQ_INSERT_TAIL(&vsmw->segs, seg, list);