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author | Eric Dumazet <dada1@cosmosbay.com> | 2007-11-05 23:38:39 -0800 |
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committer | David S. Miller <davem@sunset.davemloft.net> | 2007-11-07 04:08:57 -0800 |
commit | 286ab3d46058840d68e5d7d52e316c1f7e98c59f (patch) | |
tree | 1d70e7895c49d2b148e026aa047efe186697fff9 /.mailmap | |
parent | 91781004b9c029ee55b7aa9ef950a373ba865dc6 (diff) | |
download | kernel_samsung_smdk4412-286ab3d46058840d68e5d7d52e316c1f7e98c59f.zip kernel_samsung_smdk4412-286ab3d46058840d68e5d7d52e316c1f7e98c59f.tar.gz kernel_samsung_smdk4412-286ab3d46058840d68e5d7d52e316c1f7e98c59f.tar.bz2 |
[NET]: Define infrastructure to keep 'inuse' changes in an efficent SMP/NUMA way.
"struct proto" currently uses an array stats[NR_CPUS] to track change on
'inuse' sockets per protocol.
If NR_CPUS is big, this means we use a big memory area for this.
Moreover, all this memory area is located on a single node on NUMA
machines, increasing memory pressure on the boot node.
In this patch, I tried to :
- Keep a fast !CONFIG_SMP implementation
- Keep a fast CONFIG_SMP implementation for often used protocols
(tcp,udp,raw,...)
- Introduce a NUMA efficient implementation
Some helper macros are defined in include/net/sock.h
These macros take into account CONFIG_SMP
If a "struct proto" is declared without using DEFINE_PROTO_INUSE /
REF_PROTO_INUSE
macros, it will automatically use a default implementation, using a
dynamically allocated percpu zone.
This default implementation will be NUMA efficient, but might use 32/64
bytes per possible cpu
because of current alloc_percpu() implementation.
However it still should be better than previous implementation based on
stats[NR_CPUS] field.
When a "struct proto" is changed to use the new macros, we use a single
static "int" percpu variable,
lowering the memory and cpu costs, still preserving NUMA efficiency.
Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to '.mailmap')
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