Tim Bird at 00:57, 5 February 2011

2011-02-05T00:57:34Z

RBot: Bot (Edward's framework)

2007-03-06T03:37:01Z

Bot (Edward's framework)

New page

This page has a list of items that can be configured for the Linux kernel,
which may affect the size (RAM/ROM/static/dynamic) of the kernel.

=== Options from Linux-tiny ===
{|
|- bgcolor="ffcc00"
| CONFIG option
| description
| default value
| value for small size
| Size change (ARM)
| Notes
|-
| CONFIG_CORE_SMALL
| tune some kernel data sizes
| N
| Y
| ??
| .
|-
| CONFIG_NET_SMALL
| tune some net-related data sizes
| N
| Y
| ??
| .
|-
| CONFIG_PRINTK
| allow disable of printk code and message data
| Y
| N
| ??
| .
|-
| CONFIG_BUG
| allow elimination of BUG (and BUG_ON??) code
| Y
| N
| ??
| .
|-
| CONFIG_ELF_CORE
| allow disabling of ELF core dumps
| Y
| N
| ??
| .
|-
| CONFIG_PROC_KCORE
| allow disabling of /proc/kcore
| Y
| N
| ??
| .
|-
| CONFIG_AIO
| allow disabling of async IO syscalls
| Y
| N
| ??
| .
|-
| CONFIG_XATTR
| allow disabling of xattr syscalls
| Y
| N
| ??
| .
|-
| CONFIG_FILE_LOCKING
| allow disabling of file locking syscalls
| Y
| N
| ??
| .
|-
| CONFIG_DIRECTIO
| allow disabling of direct IO support
| Y
| N
| ??
| .
|-
| CONFIG_MAX_SWAPFILES_SHIFT
| number of swapfiles
| 5
| 0
| ??
| .
|-
| CONFIG_NR_LDISCS
| number of tty line disciplines
| 16
| 2?
| ??
| .
|-
| CONFIG_MAX_USER_RT_PRIO
| number of RT priority levels (schedule slots)
| 100
| 5?
| ??
| .
|- bgcolor="ffcc00"
| Other config options
| These are not in Linux-tiny, but help with size
| default
| small
| Size change (ARM)
| Notes
|-
| CONFIG_KALLSYMS
| load all symbols for debugging/kksymoops
| Y
| N
| ??
| .
|-
| CONFIG_SHMEM
| allow use of shmem filesystem
| Y
| N
| ??
| .
|}

=== Options for size instrumentation ===
{|
|- bgcolor="ffcc00"
| Options for measuring size
| description
| default value
| value for instrumentation
|-
| CONFIG_KMALLOC_ACCOUNTING
| turn on kmalloc accounting
| N
| Y
|-
| CONFIG_AUDIT_BOOTMEM
| print out all bootmem allocations
| N
| Y
|-
| CONFIG_DEPRECATE_INLINES
| cause compiler to emit info about inlines
| N
| Y
|}

== options that should be investigated ==
{|
|-
| Option
| default value
| value for small size
| Size change
| Notes
|-
| CONFIG_SERIAL_8250_NR_UARTS
| 4
| 0
| ??
| only useful for non-legacy ports, depends on hardware, but most embedded hardware has only legacy serial ports
|}

- by default (at least on my OSK config), several different schedulers are configured
* only one should be used and others not compiled in.

← Older revision		Revision as of 00:57, 5 February 2011
Line 168:		Line 168:
	- by default (at least on my OSK config), several different schedulers are configured		- by default (at least on my OSK config), several different schedulers are configured
	* only one should be used and others not compiled in.		* only one should be used and others not compiled in.
		+
		+	[[Category:System Size]]

Size Tunables - Revision history

Tim Bird at 00:57, 5 February 2011

RBot: Bot (Edward's framework)