linux-kernel - Re: [PATCH] modules: Use a better scheme for refcounting

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:	Fri, 16 May 2008 06:44:00 +0200
From:	Eric Dumazet <dada1@...mosbay.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	linux kernel <linux-kernel@...r.kernel.org>,
	Mike Travis <travis@....com>
Subject: Re: [PATCH] modules: Use a better scheme for refcounting

Andi Kleen a écrit :
> Eric Dumazet <dada1@...mosbay.com> writes:
>   
>> Instead of wasting NR_CPUS*128 bytes (on i386), we now use
>> num_possible_cpus*sizeof(local_t) bytes.
>>
>> On a typical distro, where NR_CPUS=8, 
>>     
>
> More typical would be NR_CPUS=128, with NR_CPUS=four digits 
> when Mike Travis et.al. are finished
>
>   
Yes. With NR_CPUS=4096, we save about half a megabyte per module. (!!!)

>> shiping 2000 modules, we reduce
>>     
>
> Surely only the loaded modules count? Perhaps 20-30.
>
>   
Well, I should have stated that this saving also takes place in the 
module disk file.
(The "struct module" is included in it, in the 
".gnu.linkonce.this_module" section)
Here on my distro, around 2000 modules are shiped.
> But it's a cool improvement. Very nice.
>   
Thanks




--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/