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net: reorder flowi_common fields to avoid holes
the flowi* structures are used and memsetted by server functions in critical path. Currently flowi_common has a couple of holes that we can eliminate reordering the struct fields. As a side effect, both flowi4 and flowi6 shrink by 8 bytes. Before: pahole -EC flowi_common struct flowi_common { // ... /* size: 40, cachelines: 1, members: 10 */ /* sum members: 32, holes: 1, sum holes: 4 */ /* padding: 4 */ /* last cacheline: 40 bytes */ }; pahole -EC flowi6 struct flowi6 { // ... /* size: 88, cachelines: 2, members: 6 */ /* padding: 4 */ /* last cacheline: 24 bytes */ }; pahole -EC flowi4 struct flowi4 { // ... /* size: 56, cachelines: 1, members: 4 */ /* padding: 4 */ /* last cacheline: 56 bytes */ }; After: struct flowi_common { // ... /* size: 32, cachelines: 1, members: 10 */ /* last cacheline: 32 bytes */ }; struct flowi6 { // ... /* size: 80, cachelines: 2, members: 6 */ /* padding: 4 */ /* last cacheline: 16 bytes */ }; struct flowi4 { // ... /* size: 48, cachelines: 1, members: 4 */ /* padding: 4 */ /* last cacheline: 48 bytes */ }; Signed-off-by: Paolo Abeni <pabeni@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -38,8 +38,8 @@ struct flowi_common {
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#define FLOWI_FLAG_KNOWN_NH 0x02
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#define FLOWI_FLAG_SKIP_NH_OIF 0x04
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__u32 flowic_secid;
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struct flowi_tunnel flowic_tun_key;
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kuid_t flowic_uid;
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struct flowi_tunnel flowic_tun_key;
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};
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union flowi_uli {
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