From 21371f768bf7127ee45bfaadd17899df6a439e8f Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Mon, 24 Dec 2007 20:57:56 -0800 Subject: [SOCK] Avoid divides in sk_stream_pages() and __sk_stream_mem_reclaim() sk_forward_alloc being signed, we should take care of divides by SK_STREAM_MEM_QUANTUM we do in sk_stream_pages() and __sk_stream_mem_reclaim() This patchs introduces SK_STREAM_MEM_QUANTUM_SHIFT, defined as ilog2(SK_STREAM_MEM_QUANTUM), to be able to use right shifts instead of plain divides. This should help compiler to choose right shifts instead of expensive divides (as seen with CONFIG_CC_OPTIMIZE_FOR_SIZE=y on x86) Signed-off-by: Eric Dumazet Signed-off-by: David S. Miller --- net/core/stream.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'net/core/stream.c') diff --git a/net/core/stream.c b/net/core/stream.c index 5586879..bf188ff 100644 --- a/net/core/stream.c +++ b/net/core/stream.c @@ -196,7 +196,7 @@ EXPORT_SYMBOL(sk_stream_error); void __sk_stream_mem_reclaim(struct sock *sk) { - atomic_sub(sk->sk_forward_alloc / SK_STREAM_MEM_QUANTUM, + atomic_sub(sk->sk_forward_alloc >> SK_STREAM_MEM_QUANTUM_SHIFT, sk->sk_prot->memory_allocated); sk->sk_forward_alloc &= SK_STREAM_MEM_QUANTUM - 1; if (*sk->sk_prot->memory_pressure && -- cgit v1.1