kernel module parallel build?

[Warner Losh]

On Dec 5, 2012, at 9:42 AM, John Baldwin wrote:

> On Tuesday, December 04, 2012 2:41:32 pm Ryan Stone wrote:
>> On Tue, Dec 4, 2012 at 10:52 AM, John Baldwin <jhb at freebsd.org> wrote:
>> 
>>> Hmm, I certainly see the module directories being built in parallel.  Some
>>> of
>>> the make jobs may not be as obvious since links are silent (no output
>>> unless
>>> there is an error).
>>> 
>>> 
>> This is definitely not the behaviour that I see trying to build any version
>> of FreeBSD.  I see the same behaviour as Andre: the depend and all targets
>> both iterate through the module directories sequentially.  It never builds
>> two module subdirectories concurrently.
> 
> Hmm, I think I was confused by seeing kernel builds intermingle with the 
> associated modules.  sys/modules/Makefile uses bsd.subdir.mk.  I think I see 
> similar things in world builds where I will see parallel builds of bin vs sbin 
> vs usr.bin vs usr.sbin, but within each of those directories the builds go 
> sequentially.  I think you would need to change bsd.subdir.mk if you want to 
> fix this.

The builds are in parallel, just that the parallelism is low because it is only parallel within the module being built. Would love to see a fix.

Warner