fellow_cache: fix obj_chg threshold - include del_thin

src/fellow_log.c

@@ -5877,7 +5877,7 @@ fellow_logwatcher_need_openlog(const struct fellow_logbuffer *lbuf,
 	const struct dle_stats *s;
 	float ratio;
 	unsigned alive, n, a;
-	size_t sz;
+	size_t sz, sum;
 
 	// XXX config
 	const unsigned thr_logregion_rewrite_pct = 50;
@@ -5933,11 +5933,12 @@ fellow_logwatcher_need_openlog(const struct fellow_logbuffer *lbuf,
 	 */
 
 	sz = logbuffer_max_obj_chg(lbuf);
+	sum  = s->obj_del_thin;
+	sum += s->obj_chg;
 
-	if (s->obj_chg >= sz) {
+	if (sum >= sz) {
 		if (why) {
-			bprintf(why->s, "obj_chg %u > %zu",
-			    s->obj_chg, sz);
+			bprintf(why->s, "dle_chg %zu > %zu", sum, sz);
 		}
 		return (FLW_NEED_REWRITE);
 	}
@@ -6778,7 +6779,8 @@ fellow_log_dle_submit(struct fellow_fd *ffd,
 		 * underway, wait for the new log to appear
 		 */
 		if (prep->dle_stats.obj_chg > 0 &&
-		    ffd->logbuf->dle_stats.obj_chg
+		    ((size_t)ffd->logbuf->dle_stats.obj_chg +
+		     ffd->logbuf->dle_stats.obj_del_thin)
 		    >= logbuffer_max_obj_chg(ffd->logbuf)) {
 			if (ffd->rewriting) {
 				AZ(pthread_cond_wait(&ffd->new_logbuf_cond,