Le 13/04/2017 à 10:19, Balbir Singh a écrit :
On Thu, 2017-04-13 at 09:24 +0200, Christophe LEROY wrote:
Hi Baldir
Hi Christophe, It's Balbir
Sorry
Le 13/04/2017 à 09:03, Balbir Singh a écrit :
We expect to have these configs on by default, most
distros turn them off, its always good to have them on
so that we can use them and hopefully not break them
Isn't it the purpose of the target allyesconfig to allow such tests ?
As a developer I don't use allyesconfig for submitting patches or testing
the kernel.
I do it most of the time to check compilation doesn't fail.
FTRACE is quite CPU consumming, shouldn't it really be on by default ?
It does some work at boot to NOP out function entry points at _mcount
locations. Is that what you are referring to? Or the overhead of the
code in terms of size? Most distro kernels have tracing on by default.
You said in you patch text: "most distros turn them off".
If most distros turn it ON (and not OFF as you said), then I can
understand we have it ON as well in defconfigs.
Christophe
The rest of the overhead is enablement based.
Thanks for the review!
Balbir Singh
