From: Linus Lüssing <linus.luessing@c0d3.blue>
Date: Tue, 2 Jan 2018 19:32:58 +0100
Subject: kernel: pkt_sched: fq_codel: debug info for fq codel flow allocations

diff --git a/target/linux/generic/patches-4.4/665-0001-pkt_sched-fq_codel-debug-info-for-fq-codel-flow-allo.patch b/target/linux/generic/patches-4.4/665-0001-pkt_sched-fq_codel-debug-info-for-fq-codel-flow-allo.patch
new file mode 100644
index 0000000000000000000000000000000000000000..f679b2bf226efa2250cf8f3b8be054c7aea3872c
--- /dev/null
+++ b/target/linux/generic/patches-4.4/665-0001-pkt_sched-fq_codel-debug-info-for-fq-codel-flow-allo.patch
@@ -0,0 +1,86 @@
+From 55d3a297b281ba679aff86b8a3ad6f4f7cbc43a6 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Linus=20L=C3=BCssing?= <linus.luessing@c0d3.blue>
+Date: Tue, 2 Jan 2018 19:29:17 +0100
+Subject: [PATCH 1/2] pkt_sched: fq_codel: debug info for fq codel flow
+ allocations
+
+This patch adds some debug output for fq codel flow allocations.
+It also prevents allocating them via vmalloc, only allowing kmalloc.
+---
+ net/sched/sch_fq_codel.c | 36 +++++++++++++++++++++++++++++++++---
+ 1 file changed, 33 insertions(+), 3 deletions(-)
+
+diff --git a/net/sched/sch_fq_codel.c b/net/sched/sch_fq_codel.c
+index 0e211d729d43..aac564433d40 100644
+--- a/net/sched/sch_fq_codel.c
++++ b/net/sched/sch_fq_codel.c
+@@ -25,6 +25,15 @@
+ #include <net/pkt_sched.h>
+ #include <net/codel.h>
+ 
++
++static inline char *SCH_DEV_NAME(struct Qdisc *sch)
++{
++	if (sch && sch->dev_queue && sch->dev_queue->dev && sch->dev_queue->dev->name)
++		return sch->dev_queue->dev->name;
++	else
++		return "<unknown>";
++}
++
+ /*	Fair Queue CoDel.
+  *
+  * Principles :
+@@ -443,15 +452,23 @@ static int fq_codel_change(struct Qdisc *sch, struct nlattr *opt)
+ 
+ static void *fq_codel_zalloc(size_t sz)
+ {
+-	void *ptr = kzalloc(sz, GFP_KERNEL | __GFP_NOWARN);
++	void *ptr = kzalloc(sz, GFP_KERNEL);
++//	void *ptr = kzalloc(sz, GFP_KERNEL | __GFP_NOWARN);
+ 
+-	if (!ptr)
+-		ptr = vzalloc(sz);
++	printk("~~~ %s: Allocating, sz: %lu\n", __func__, sz);
++	if (ptr)
++                printk("~~~ %s: Allocated at: %p\n", __func__, ptr);
++        else
++                printk("~~~ %s: Allocation failed\n", __func__);
++
++//	if (!ptr)
++//		ptr = vzalloc(sz);
+ 	return ptr;
+ }
+ 
+ static void fq_codel_free(void *addr)
+ {
++	printk("~~~ %s: Freeing memory at %p\n", __func__, addr);
+ 	kvfree(addr);
+ }
+ 
+@@ -488,10 +505,23 @@ static int fq_codel_init(struct Qdisc *sch, struct nlattr *opt)
+ 	}
+ 
+ 	if (!q->flows) {
++		printk("~~~ %s: %s: Calling fq_codel_zalloc() with sz: %lu (cnt: %u, szof(): %lu) for flows\n",
++		       __func__,
++		       SCH_DEV_NAME(sch),
++		       q->flows_cnt * sizeof(struct fq_codel_flow),
++		       q->flows_cnt, sizeof(struct fq_codel_flow));
++
+ 		q->flows = fq_codel_zalloc(q->flows_cnt *
+ 					   sizeof(struct fq_codel_flow));
+ 		if (!q->flows)
+ 			return -ENOMEM;
++
++		printk("~~~ %s: %s: Calling fq_codel_zalloc() with sz: %lu (cnt: %u, szof(): %lu) for backlogs\n",
++		       __func__,
++		       SCH_DEV_NAME(sch),
++		       q->flows_cnt * sizeof(u32),
++		       q->flows_cnt, sizeof(u32));
++
+ 		q->backlogs = fq_codel_zalloc(q->flows_cnt * sizeof(u32));
+ 		if (!q->backlogs) {
+ 			fq_codel_free(q->flows);
+-- 
+2.11.0
+