lkml.org 
[lkml]   [2008]   [Apr]   [9]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRe: [patch 12/17] Immediate Values - Kconfig menu in EMBEDDED
Date
On Thursday 10 April 2008 01:08:41 Mathieu Desnoyers wrote:
> +config IMMEDIATE
> + default y if !DISABLE_IMMEDIATE

Wouldn't it be simlpler to roll DISABLE_IMMEDIATE into this?

ie.
default y
depends on HAVE_IMMEDIATE
bool "Immediate value optimization" if EMBEDDED
help
Immediate values are used as read-mostly variables that are rarely
updated. They use code patching to modify the values inscribed in the
instruction stream. It provides a way to save precious cache lines
that would otherwise have to be used by these variables.

It consumes slightly more memory and requires to modify the instruction
stream each time a variable is updated. Should really be disabled for
embedded systems with read-only text.

Cheers,
Rusty.


\
 
 \ /
  Last update: 2008-04-10 05:27    [W:0.099 / U:5.372 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site