b6c6712a42
With latest CONFIG_PROVE_RCU stuff, I felt more comfortable to make this work. sk->sk_dst_cache is currently protected by a rwlock (sk_dst_lock) This rwlock is readlocked for a very small amount of time, and dst entries are already freed after RCU grace period. This calls for RCU again :) This patch converts sk_dst_lock to a spinlock, and use RCU for readers. __sk_dst_get() is supposed to be called with rcu_read_lock() or if socket locked by user, so use appropriate rcu_dereference_check() condition (rcu_read_lock_held() || sock_owned_by_user(sk)) This patch avoids two atomic ops per tx packet on UDP connected sockets, for example, and permits sk_dst_lock to be much less dirtied. Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net> |
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|---|---|---|
| .. | ||
| netfilter | ||
| af_decnet.c | ||
| dn_dev.c | ||
| dn_fib.c | ||
| dn_neigh.c | ||
| dn_nsp_in.c | ||
| dn_nsp_out.c | ||
| dn_route.c | ||
| dn_rules.c | ||
| dn_table.c | ||
| dn_timer.c | ||
| Kconfig | ||
| Makefile | ||
| README | ||
| sysctl_net_decnet.c | ||
| TODO | ||
Linux DECnet Project
======================
The documentation for this kernel subsystem is available in the
Documentation/networking subdirectory of this distribution and also
on line at http://www.chygwyn.com/DECnet/
Steve Whitehouse <SteveW@ACM.org>