[PATCH net v2 0/2] ipv6: prevent fib6_run_gc() contention

[Michal Kubecek <mkubecek@suse.cz>]

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