netdev - [PATCH net v2 0/2] ipv6: prevent fib6_run

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Date:	Thu,  1 Aug 2013 10:04:04 +0200 (CEST)
From:	Michal Kubecek <mkubecek@...e.cz>
To:	"David S. Miller" <davem@...emloft.net>
Cc:	Eric Dumazet <eric.dumazet@...il.com>, netdev@...r.kernel.org,
	Alexey Kuznetsov <kuznet@....inr.ac.ru>,
	James Morris <jmorris@...ei.org>,
	Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
	Patrick McHardy <kaber@...sh.net>
Subject: [PATCH net v2 0/2] ipv6: prevent fib6_run_gc() contention

On a high-traffic router with many processors and many IPv6 dst entries,
soft lockup in fib6_run_gc() can occur when number of entries reaches
gc_thresh. Prevent this by not waiting for the lock if garbage collector
is already running as we would only run it again as soon as it finished.

v2: as suggested by Eric Dumazet, move update of ip6_rt_last_gc into
    fib6_run_gc() so that it reflects every run of garbage collector
    rather than only those via ip6_dst_gc()

Michal Kubecek (2):
  ipv6: prevent fib6_run_gc() contention
  ipv6: update ip6_rt_last_gc every time GC is run

 include/net/ip6_fib.h |  2 +-
 net/ipv6/ip6_fib.c    | 25 +++++++++++++------------
 net/ipv6/ndisc.c      |  4 ++--
 net/ipv6/route.c      |  8 +++-----
 4 files changed, 19 insertions(+), 20 deletions(-)

-- 
1.8.1.4

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