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authorStephen Hemminger <shemminger@vyatta.com>2009-04-28 22:36:33 -0700
committerDavid S. Miller <davem@davemloft.net>2009-04-28 22:36:33 -0700
commit942e4a2bd680c606af0211e64eb216be2e19bf61 (patch)
treea83af49242d4a8d53aa0f3b5814eb17da72edc09 /include/linux/usb/gadgetfs.h
parentbf368e4e70cd4e0f880923c44e95a4273d725ab4 (diff)
netfilter: revised locking for x_tables
The x_tables are organized with a table structure and a per-cpu copies of the counters and rules. On older kernels there was a reader/writer lock per table which was a performance bottleneck. In 2.6.30-rc, this was converted to use RCU and the counters/rules which solved the performance problems for do_table but made replacing rules much slower because of the necessary RCU grace period. This version uses a per-cpu set of spinlocks and counters to allow to table processing to proceed without the cache thrashing of a global reader lock and keeps the same performance for table updates. Signed-off-by: Stephen Hemminger <shemminger@vyatta.com> Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/linux/usb/gadgetfs.h')
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