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| author | Pavel Emelyanov <xemul@openvz.org> | 2007-11-19 23:20:59 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2008-01-28 14:54:36 -0800 |
| commit | 9859a79023d71dd4e56c195a345abc4112abfd02 (patch) | |
| tree | 5492ce13e237b6fb9cf284d3fdfd062793dc1126 /net/core/stream.c | |
| parent | 3ef1355dcb8551730cc71e9ef4363f5c66ccad17 (diff) | |
| download | op-kernel-dev-9859a79023d71dd4e56c195a345abc4112abfd02.zip op-kernel-dev-9859a79023d71dd4e56c195a345abc4112abfd02.tar.gz | |
[NET]: Compact sk_stream_mem_schedule() code
This function references sk->sk_prot->xxx for many times.
It turned out, that there's so many code in it, that gcc
cannot always optimize access to sk->sk_prot's fields.
After saving the sk->sk_prot on the stack and comparing
disassembled code, it turned out that the function became
~10 bytes shorter and made less dereferences (on i386 and
x86_64). Stack consumption didn't grow.
Besides, this patch drives most of this function into the
80 columns limit.
Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Acked-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core/stream.c')
| -rw-r--r-- | net/core/stream.c | 27 |
1 files changed, 14 insertions, 13 deletions
diff --git a/net/core/stream.c b/net/core/stream.c index 755bacb..b2fb846 100644 --- a/net/core/stream.c +++ b/net/core/stream.c @@ -210,35 +210,36 @@ EXPORT_SYMBOL(__sk_stream_mem_reclaim); int sk_stream_mem_schedule(struct sock *sk, int size, int kind) { int amt = sk_stream_pages(size); + struct proto *prot = sk->sk_prot; sk->sk_forward_alloc += amt * SK_STREAM_MEM_QUANTUM; - atomic_add(amt, sk->sk_prot->memory_allocated); + atomic_add(amt, prot->memory_allocated); /* Under limit. */ - if (atomic_read(sk->sk_prot->memory_allocated) < sk->sk_prot->sysctl_mem[0]) { - if (*sk->sk_prot->memory_pressure) - *sk->sk_prot->memory_pressure = 0; + if (atomic_read(prot->memory_allocated) < prot->sysctl_mem[0]) { + if (*prot->memory_pressure) + *prot->memory_pressure = 0; return 1; } /* Over hard limit. */ - if (atomic_read(sk->sk_prot->memory_allocated) > sk->sk_prot->sysctl_mem[2]) { - sk->sk_prot->enter_memory_pressure(); + if (atomic_read(prot->memory_allocated) > prot->sysctl_mem[2]) { + prot->enter_memory_pressure(); goto suppress_allocation; } /* Under pressure. */ - if (atomic_read(sk->sk_prot->memory_allocated) > sk->sk_prot->sysctl_mem[1]) - sk->sk_prot->enter_memory_pressure(); + if (atomic_read(prot->memory_allocated) > prot->sysctl_mem[1]) + prot->enter_memory_pressure(); if (kind) { - if (atomic_read(&sk->sk_rmem_alloc) < sk->sk_prot->sysctl_rmem[0]) + if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0]) return 1; - } else if (sk->sk_wmem_queued < sk->sk_prot->sysctl_wmem[0]) + } else if (sk->sk_wmem_queued < prot->sysctl_wmem[0]) return 1; - if (!*sk->sk_prot->memory_pressure || - sk->sk_prot->sysctl_mem[2] > atomic_read(sk->sk_prot->sockets_allocated) * + if (!*prot->memory_pressure || + prot->sysctl_mem[2] > atomic_read(prot->sockets_allocated) * sk_stream_pages(sk->sk_wmem_queued + atomic_read(&sk->sk_rmem_alloc) + sk->sk_forward_alloc)) @@ -258,7 +259,7 @@ suppress_allocation: /* Alas. Undo changes. */ sk->sk_forward_alloc -= amt * SK_STREAM_MEM_QUANTUM; - atomic_sub(amt, sk->sk_prot->memory_allocated); + atomic_sub(amt, prot->memory_allocated); return 0; } |
