linux-kernel - Re: Suggestions request for speed-up kernel compilation

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Fri, 24 Apr 2009 12:38:37 +0200
From:	Sam Ravnborg <sam@...nborg.org>
To:	Alessio Igor Bogani <abogani@...ware.it>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: Suggestions request for speed-up kernel compilation

On Fri, Apr 24, 2009 at 11:57:35AM +0200, Alessio Igor Bogani wrote:
> Hi All,
> 
> Sorry for my bad English.
> 
> I'm a kernel newbie and I would be very happy to receive some tips
> about kernel compilation from experienced developers.
> 
> I have recently elaborated some trivial patches. For each one I have
> done a build test at minimum and I find myself spend a lot of time
> waiting my Core Duo to accomplish this task. Make is a very smart tool
> but after a git pull or a git fetch origin/git reset --hard origin it
> can't help as desired.
> 
> Unfortunately I don't have a clustered compilation farm under my control. :-)
> 
> Anyone can suggest me how mitigate that issue?
The kernel build system does a good job detecting what to build.
So if you touches a .h file or you change a CONFIG_ symbol used by
a header file you will see a lot of rebuilds - sometimes
more than you expected.

Try to do:

    make V=2

to see why a certain file is rebuild.


If you know you only have to build a single file you can use:

    make kernel/foo.o

If you want to build a directory - including sub-directories:

   make kernel/

If you want to build a specific module use:

    make drivers/net/foobar.ko

make help can give you a few more hints.

And try to avoid "make clean" / "make mrproper" - as this deletes all .o files.

	Sam
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/