netdev - Re: [PATCH] Compact sk_stream_mem

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Mon, 19 Nov 2007 17:30:59 -0200
From:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
To:	Pavel Emelyanov <xemul@...nvz.org>
Cc:	David Miller <davem@...emloft.net>, devel@...nvz.org,
	Linux Netdev List <netdev@...r.kernel.org>
Subject: Re: [PATCH] Compact sk_stream_mem_schedule() code

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@...nvz.org>

I wonder if making it 'const struct proto *prot = sk->sk_prot;'

would make any difference.

Acked-by: Arnaldo Carvalho de Melo <acme@...hat.com>
-
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html