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neigh: Protect neigh->ha[] with a seqlock
authorEric Dumazet <eric.dumazet@gmail.com>
Thu, 7 Oct 2010 10:44:07 +0000 (10:44 +0000)
committerDavid S. Miller <davem@davemloft.net>
Mon, 11 Oct 2010 19:54:04 +0000 (12:54 -0700)
commitb84d3d4d47ea5bb5aaaec6d2a782065bb2abd2dd
treecf1d9eb14668c4d2257b3519ed7deec8c5cb396dtree | snapshot
parent066bfe7cadb874bc8289a3331ea6ab0b886a9754commit | diff
neigh: Protect neigh->ha[] with a seqlock

Add a seqlock in struct neighbour to protect neigh->ha[], and avoid
dirtying neighbour in stress situation (many different flows / dsts)

Dirtying takes place because of read_lock(&n->lock) and n->used writes.

Switching to a seqlock, and writing n->used only on jiffies changes
permits less dirtying.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
include/net/neighbour.h diff | blob | history
net/core/neighbour.c diff | blob | history
net/ipv4/arp.c diff | blob | history
net/sched/sch_teql.c diff | blob | history
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