netdev - [PATCH net-next 3/5] net_sched: sch_fq: use bulk freeing in fq

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Sat,  2 May 2020 19:54:20 -0700
From:   Eric Dumazet <edumazet@...gle.com>
To:     "David S . Miller" <davem@...emloft.net>
Cc:     netdev <netdev@...r.kernel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        Eric Dumazet <eric.dumazet@...il.com>
Subject: [PATCH net-next 3/5] net_sched: sch_fq: use bulk freeing in fq_gc()

fq_gc() already builds a small array of pointers, so using
kmem_cache_free_bulk() needs very little change.

Signed-off-by: Eric Dumazet <edumazet@...gle.com>
---
 net/sched/sch_fq.c | 20 ++++++++++++--------
 1 file changed, 12 insertions(+), 8 deletions(-)

diff --git a/net/sched/sch_fq.c b/net/sched/sch_fq.c
index 7a2b3195938ede3c14c37b90c9604185cfa3f651..56e4f3c4380c517136b22862771f9899a7fd99f2 100644
--- a/net/sched/sch_fq.c
+++ b/net/sched/sch_fq.c
@@ -218,9 +218,10 @@ static void fq_gc(struct fq_sched_data *q,
 		  struct rb_root *root,
 		  struct sock *sk)
 {
-	struct fq_flow *f, *tofree[FQ_GC_MAX];
 	struct rb_node **p, *parent;
-	int fcnt = 0;
+	void *tofree[FQ_GC_MAX];
+	struct fq_flow *f;
+	int i, fcnt = 0;
 
 	p = &root->rb_node;
 	parent = NULL;
@@ -243,15 +244,18 @@ static void fq_gc(struct fq_sched_data *q,
 			p = &parent->rb_left;
 	}
 
-	q->flows -= fcnt;
-	q->inactive_flows -= fcnt;
-	q->stat_gc_flows += fcnt;
-	while (fcnt) {
-		struct fq_flow *f = tofree[--fcnt];
+	if (!fcnt)
+		return;
 
+	for (i = fcnt; i > 0; ) {
+		f = tofree[--i];
 		rb_erase(&f->fq_node, root);
-		kmem_cache_free(fq_flow_cachep, f);
 	}
+	q->flows -= fcnt;
+	q->inactive_flows -= fcnt;
+	q->stat_gc_flows += fcnt;
+
+	kmem_cache_free_bulk(fq_flow_cachep, fcnt, tofree);
 }
 
 static struct fq_flow *fq_classify(struct sk_buff *skb, struct fq_sched_data *q)
-- 
2.26.2.526.g744177e7f7-goog