Thinning out GENERIC
Sean Bruno
sbruno at freebsd.org
Fri Feb 17 19:54:35 UTC 2017
On 02/17/17 12:49, John Baldwin wrote:
> On Friday, February 17, 2017 11:43:45 AM Sean Bruno wrote:
>>
>> On 02/13/17 11:33, John Baldwin wrote:
>>> On Monday, February 13, 2017 10:51:36 AM Warner Losh wrote:
>>>> [[ It isn't just GENERIC, it's in every single kernel ]]
>>>>
>>>> On Sun, Feb 12, 2017 at 7:59 AM, Sean Bruno <sbruno at freebsd.org> wrote:
>>>>> Index: sys/conf/files
>>>>> ===================================================================
>>>>> --- sys/conf/files (revision 313683)
>>>>> +++ sys/conf/files (working copy)
>>>>> @@ -2419,7 +2419,7 @@
>>>>> dev/pci/pci_user.c optional pci
>>>>> dev/pci/pcib_if.m standard
>>>>> dev/pci/pcib_support.c standard
>>>>> -dev/pci/vga_pci.c optional pci
>>>>> +#dev/pci/vga_pci.c optional pci
>>>>> dev/pcn/if_pcn.c optional pcn pci
>>>>> dev/pdq/if_fea.c optional fea eisa
>>>>> dev/pdq/if_fpa.c optional fpa pci
>>>>>
>>>>> I'm playing around with small x86 builds and wanted to come up with a
>>>>> knob that disables the vga_pci driver. Obviously I still want pci(4) to
>>>>> be enabled, but I definitely do not need the vga interfaces for
>>>>> anything. Any suggestions?
>>>>
>>>> You could make it dependent on vt or sc as well as pci, no?
>>>
>>> This is a fairly small driver:
>>>
>>> 6139 340 8 6487 0x1957 /usr/obj/usr/src/sys/GENERIC
>>> /vga_pci.o
>>>
>>> (From an 11.0-stable build)
>>>
>>> device ppc and friends is a lot more for example:
>>>
>>> text data bss dec hex filename
>>> 6238 0 0 6238 0x185e /usr/obj/usr/src/sys/GENERIC/ppb_1284.o
>>> 1675 28 0 1703 0x6a7 /usr/obj/usr/src/sys/GENERIC/ppb_base.o
>>> 2042 0 0 2042 0x7fa /usr/obj/usr/src/sys/GENERIC/ppb_msq.o
>>> 6025 296 8 6329 0x18b9 /usr/obj/usr/src/sys/GENERIC/ppbconf.o
>>> 0 168 0 168 0xa8 /usr/obj/usr/src/sys/GENERIC/ppbus_if.o
>>> 9099 36 0 9135 0x23af /usr/obj/usr/src/sys/GENERIC/ppc.o
>>> 495 256 0 751 0x2ef /usr/obj/usr/src/sys/GENERIC/ppc_acpi.o
>>> 1671 256 0 1927 0x787 /usr/obj/usr/src/sys/GENERIC/ppc_isa.o
>>> 1124 208 0 1332 0x534 /usr/obj/usr/src/sys/GENERIC/ppc_pci.o
>>> 451 208 0 659 0x293 /usr/obj/usr/src/sys/GENERIC/ppc_puc.o
>>> 2751 428 8 3187 0xc73 /usr/obj/usr/src/sys/GENERIC/ppi.o
>>>
>>> It is needed for drm.
>>>
>>
>> Ok, so ... make it dependant on drm, vt, sc and pci?
>
> You can kldload drm at runtime, so a static dependency isn't sufficient.
> It's not clear why removing this from GENERIC is that important. ppc is on far
> fewer machines than vga_pci and takes up 10x more space.
>
I don't want to remove it from GENERIC. I want to add the capability to
remove it. Sorry if that wasn't clear from my subject line, because it
doesn't look clear now that I re-read it.
sean
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