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authorEric Dumazet <dada1@cosmosbay.com>2007-11-07 02:40:20 -0800
committerDavid S. Miller <davem@sunset.davemloft.net>2007-11-07 04:15:11 -0800
commit230140cffa7feae90ad50bf259db1fa07674f3a7 (patch)
tree815472add31606423a508a17806b7884f0ab3e2e /ipc/mqueue.c
parentefac52762b1e3fe3035d29e82d8ee1aebc45e4a7 (diff)
downloadlinux-linaro-stable-230140cffa7feae90ad50bf259db1fa07674f3a7.tar.gz
[INET]: Remove per bucket rwlock in tcp/dccp ehash table.
As done two years ago on IP route cache table (commit 22c047ccbc68fa8f3fa57f0e8f906479a062c426) , we can avoid using one lock per hash bucket for the huge TCP/DCCP hash tables. On a typical x86_64 platform, this saves about 2MB or 4MB of ram, for litle performance differences. (we hit a different cache line for the rwlock, but then the bucket cache line have a better sharing factor among cpus, since we dirty it less often). For netstat or ss commands that want a full scan of hash table, we perform fewer memory accesses. Using a 'small' table of hashed rwlocks should be more than enough to provide correct SMP concurrency between different buckets, without using too much memory. Sizing of this table depends on num_possible_cpus() and various CONFIG settings. This patch provides some locking abstraction that may ease a future work using a different model for TCP/DCCP table. Signed-off-by: Eric Dumazet <dada1@cosmosbay.com> Acked-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'ipc/mqueue.c')
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