lkml.org 
[lkml]   [2011]   [Feb]   [8]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH] Remove CONFIG_PM altogether, enable power management all the time

* Tim Bird <tbird20d@gmail.com> wrote:

> On Tue, Feb 8, 2011 at 4:21 AM, Ingo Molnar <mingo@elte.hu> wrote:
>
> > Rafael, could you do a defconfig-ish x86 build with and without CONFIG_PM, and
> > post the 'size vmlinux' comparison - so that we can see the size difference? We
> > make some things CONFIG_EXPERT configurable just to enable folks who *really*
> > want to cut down on kernel size to configure it out.
>
> I'm one of those people who *really* wants to cut down the kernel size. I've
> recently worked on a product where the kernel RAM budget is ~1M.

Did that kernel have CONFIG_PM disabled?

> > Note that those usecases, even if they want a super-small kernel, might not care
> > about PM at all while they care about size: small boot kernels in ROMs, or
> > simple devices where CPU-idling implies deep low power mode, etc.
>
> So the vmlinux size comparisons would be needed really. If it's 5k nobody will
> care. I care about 5K. (But honestly, I don't actively hunt stuff less than 10K
> in size, because there's too many of them to chase, currently).

The numbers that Frank Rowand sent show 40K+:

|
| For 2.6.38-rc4, x86_64, CONFIG_NR_CPUS=4:
|
| size vmlinux
| text data bss dec hex filename
|
| 6553910 3555020 9994240 20103170 132c002 vmlinux with CONFIG_PM
| 6512652 3553116 9994240 20060008 1321768 vmlinux without CONFIG_PM
|
| 41258 1904 0 43162 delta
|

Thanks,

Ingo


\
 
 \ /
  Last update: 2011-02-09 03:45    [from the cache]
©2003-2014 Jasper Spaans. Advertise on this site