summaryrefslogtreecommitdiffstats
path: root/Documentation/sysfs-rules.txt
diff options
context:
space:
mode:
authorEric Dumazet <dada1@cosmosbay.com>2008-11-16 19:37:55 -0800
committerDavid S. Miller <davem@davemloft.net>2008-11-16 19:37:55 -0800
commitbbaffaca4810de1a25e32ecaf836eeaacc7a3d11 (patch)
treef0b215577427ab12ab4ae7b3f45cd6ad3fe16499 /Documentation/sysfs-rules.txt
parente8b2dfe9b4501ed0047459b2756ba26e5a940a69 (diff)
downloadblackbird-op-linux-bbaffaca4810de1a25e32ecaf836eeaacc7a3d11.tar.gz
blackbird-op-linux-bbaffaca4810de1a25e32ecaf836eeaacc7a3d11.zip
rcu: Introduce hlist_nulls variant of hlist
hlist uses NULL value to finish a chain. hlist_nulls variant use the low order bit set to 1 to signal an end-of-list marker. This allows to store many different end markers, so that some RCU lockless algos (used in TCP/UDP stack for example) can save some memory barriers in fast paths. Two new files are added : include/linux/list_nulls.h - mimics hlist part of include/linux/list.h, derived to hlist_nulls variant include/linux/rculist_nulls.h - mimics hlist part of include/linux/rculist.h, derived to hlist_nulls variant Only four helpers are declared for the moment : hlist_nulls_del_init_rcu(), hlist_nulls_del_rcu(), hlist_nulls_add_head_rcu() and hlist_nulls_for_each_entry_rcu() prefetches() were removed, since an end of list is not anymore NULL value. prefetches() could trigger useless (and possibly dangerous) memory transactions. Example of use (extracted from __udp4_lib_lookup()) struct sock *sk, *result; struct hlist_nulls_node *node; unsigned short hnum = ntohs(dport); unsigned int hash = udp_hashfn(net, hnum); struct udp_hslot *hslot = &udptable->hash[hash]; int score, badness; rcu_read_lock(); begin: result = NULL; badness = -1; sk_nulls_for_each_rcu(sk, node, &hslot->head) { score = compute_score(sk, net, saddr, hnum, sport, daddr, dport, dif); if (score > badness) { result = sk; badness = score; } } /* * if the nulls value we got at the end of this lookup is * not the expected one, we must restart lookup. * We probably met an item that was moved to another chain. */ if (get_nulls_value(node) != hash) goto begin; if (result) { if (unlikely(!atomic_inc_not_zero(&result->sk_refcnt))) result = NULL; else if (unlikely(compute_score(result, net, saddr, hnum, sport, daddr, dport, dif) < badness)) { sock_put(result); goto begin; } } rcu_read_unlock(); return result; Signed-off-by: Eric Dumazet <dada1@cosmosbay.com> Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'Documentation/sysfs-rules.txt')
0 files changed, 0 insertions, 0 deletions
OpenPOWER on IntegriCloud