Bug 173202

Summary:	CONFIG_DEBUG_INFO=y by default
Product:	Red Hat Enterprise Linux 4	Reporter:	Jean Blouin <blouin>
Component:	kernel	Assignee:	Dave Jones <davej>
Status:	CLOSED NOTABUG	QA Contact:	Brian Brock <bbrock>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	4.0	CC:	davej, pfrields
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Hardware:	x86_64
OS:	Linux
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Fixed In Version:		Doc Type:	Bug Fix
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Clone Of:		Environment:
Last Closed:	2005-11-15 04:17:06 UTC	Type:	---
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
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Embargoed:

Description Jean Blouin 2005-11-14 22:02:30 UTC

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Description of problem:
The default config file sets

the following config options:

CONFIG_DEBUG_INFO=y
and 
CONFIG_CC_OPTIMIZE_FOR_SIZE=y

this ends up compiling most of the files with 
-g -Os

wouldn't it be preferable for performance to compile with both this options unsetted? Than the code would be compiled with -O2?


Version-Release number of selected component (if applicable):
kernel-smp-2.6.9-22.EL

How reproducible:
Always

Steps to Reproduce:
1.compile the kernel with make bzImage V=1
2.see that most files are compiled with -g -Os
3.
  

Actual Results:  most kernel files are compiled with -g -Os

Expected Results:  if you unsetted the CONFIG_DEBUG_INFO and the CONFIG_CC_OPTIMIZE_FOR_SIZE
then most file will be compile with -O2

Additional info:

Comment 1 Dave Jones 2005-11-15 04:17:06 UTC

debug info is set so that the debugging info can get stripped out to the
-debuginfo rpms.

-Os is used because cache footprint is more important on modern processors than
microoptimisations.