From: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
To: Pavel Emelyanov <xemul@openvz.org>
Cc: David Miller <davem@davemloft.net>,
devel@openvz.org, Linux Netdev List <netdev@vger.kernel.org>
Subject: Re: [PATCH] Compact sk_stream_mem_schedule() code
Date: Mon, 19 Nov 2007 17:30:59 -0200 [thread overview]
Message-ID: <20071119193059.GA5211@ghostprotocols.net> (raw)
In-Reply-To: <47417DF8.6040204@openvz.org>
Em Mon, Nov 19, 2007 at 03:13:44PM +0300, Pavel Emelyanov escreveu:
> 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>
I wonder if making it 'const struct proto *prot = sk->sk_prot;'
would make any difference.
Acked-by: Arnaldo Carvalho de Melo <acme@redhat.com>
next prev parent reply other threads:[~2007-11-19 19:31 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-11-19 12:13 [PATCH] Compact sk_stream_mem_schedule() code Pavel Emelyanov
2007-11-19 19:30 ` Arnaldo Carvalho de Melo [this message]
2007-11-20 7:22 ` David Miller
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