Patch "netfilter: conntrack: remove GC_MAX_EVICTS break" has been added to the 4.9-stable tree

[<gregkh@linuxfoundation.org>]

This is a note to let you know that I've just added the patch titled

    netfilter: conntrack: remove GC_MAX_EVICTS break

to the 4.9-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     netfilter-conntrack-remove-gc_max_evicts-break.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 524b698db06b9b6da7192e749f637904e2f62d7b Mon Sep 17 00:00:00 2001
From: Florian Westphal <fw@strlen.de>
Date: Mon, 16 Jan 2017 18:24:56 +0100
Subject: netfilter: conntrack: remove GC_MAX_EVICTS break

From: Florian Westphal <fw@strlen.de>

commit 524b698db06b9b6da7192e749f637904e2f62d7b upstream.

Instead of breaking loop and instant resched, don't bother checking
this in first place (the loop calls cond_resched for every bucket anyway).

Suggested-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: Florian Westphal <fw@strlen.de>
Acked-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 net/netfilter/nf_conntrack_core.c |    7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

--- a/net/netfilter/nf_conntrack_core.c
+++ b/net/netfilter/nf_conntrack_core.c
@@ -88,8 +88,6 @@ static __read_mostly bool nf_conntrack_l
 #define GC_MAX_BUCKETS_DIV	64u
 /* upper bound of scan intervals */
 #define GC_INTERVAL_MAX		(2 * HZ)
-/* maximum conntracks to evict per gc run */
-#define GC_MAX_EVICTS		256u
 
 static struct conntrack_gc_work conntrack_gc_work;
 
@@ -979,8 +977,7 @@ static void gc_worker(struct work_struct
 		 */
 		rcu_read_unlock();
 		cond_resched_rcu_qs();
-	} while (++buckets < goal &&
-		 expired_count < GC_MAX_EVICTS);
+	} while (++buckets < goal);
 
 	if (gc_work->exiting)
 		return;
@@ -1005,7 +1002,7 @@ static void gc_worker(struct work_struct
 	 * In case we have lots of evictions next scan is done immediately.
 	 */
 	ratio = scanned ? expired_count * 100 / scanned : 0;
-	if (ratio >= 90 || expired_count == GC_MAX_EVICTS) {
+	if (ratio >= 90) {
 		gc_work->next_gc_run = 0;
 		next_run = 0;
 	} else if (expired_count) {


Patches currently in stable-queue which might be from fw@strlen.de are

queue-4.9/netfilter-conntrack-remove-gc_max_evicts-break.patch
queue-4.9/netfilter-conntrack-refine-gc-worker-heuristics-redux.patch