From: Marek Vavruša <marek.vavrusa@nic.cz>
Date: Fri, 12 Jun 2015 22:19:42 +0000 (+0200)
Subject: layer/rrcache: work around unreclaimable pages on clear
X-Git-Tag: v1.0.0-beta1~120^2
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1c2fb029db164456d21d679551a67a1883c01a92;p=thirdparty%2Fknot-resolver.git

layer/rrcache: work around unreclaimable pages on clear
---

diff --git a/lib/layer/rrcache.c b/lib/layer/rrcache.c
index 1595accef..312470018 100644
--- a/lib/layer/rrcache.c
+++ b/lib/layer/rrcache.c
@@ -270,6 +270,14 @@ static int stash(knot_layer_t *ctx, knot_pkt_t *pkt)
 		}
 		/* Clear if full */
 		if (ret == KNOT_ESPACE) {
+			/*
+			 * Commit empty transaction to make freed pages reclaimable
+			 * (This increases the txnid)
+			 */
+			if (kr_cache_txn_begin(cache, &txn, 0) == 0) {
+				kr_cache_txn_commit(&txn);
+			}
+			/* Now drop the database */
 			if (kr_cache_txn_begin(cache, &txn, 0) == 0) {
 				ret = kr_cache_clear(&txn);
 				if (ret == 0) {