linux-kernel - Re: [patch 4/8] Immediate Value

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]

Message-ID: <20070716003322.GA26835@one.firstfloor.org>
Date:	Mon, 16 Jul 2007 02:33:22 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
Cc:	Alexey Dobriyan <adobriyan@...il.com>, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, Adrian Bunk <bunk@...sta.de>,
	Andi Kleen <andi@...stfloor.org>
Subject: Re: [patch 4/8] Immediate Value - Add kconfig menus

> On embedded systems, the tradeoff is not the same. The immediate values
> trade a little bit of system memory (to keep the pointers to the
> variable and instruction as well as the size of the variable, only used
> when the variable is updated) in order to remove cache line hot paths.

Please remove the Kconfig. I don't think it makes sense. Such optimizations
should be always enabled. We don't have CONFIG_GO_FASTER configs normally.
Don't introduce them now.

> 
> Also, embedded systems with physically read-only memory clearly does not
> want to enable this.

We always patch the x86 kernel, so they have to deal with it anyways.
The x86 port doesn't support XIP.

-Andi
-
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/