Re: Kernelshark v2 all-black plots area

[Solomon Tan <wjsota@gmail.com>]

On Wed, Apr 20, 2022 at 11:06:49AM +0300, Yordan Karadzhov wrote:
> Hi Solomon,
> 
> There are few things you can do.
> The way KernelShark build finds the font file is by running the following command in a shell:
> 
> fc-list FreeSans |grep FreeSans.ttf | cut -d':' -f 1 -z
> 
> So run the same command in a terminal and try to figure out why it fails.
> If it fails because the 'FreeSans.ttf' does not exist, you can manually provide a path to some other font file to be used.

It failed because FreeSans was installed in my system as otf instead of ttf hahaha.
> 
> cd kernel-shark/build
> ./cmake_clean.sh
> cmake -DTT_FONT_FILE=/path/to/some/font/YourFont.ttf ..

Thank you! This command worked. I just specified the path to the otf
file instead of the ttf file, and it worked like a charm. kernel-shark
is installed and working well!

I actually faced another issue as well - which was that the compilation
appeared to be successful but kernelshark was not made at all because
FreeSans was missing. So the black plot I got was from the one I
installed from the package manager. But now I have kernelshark installed 
from your github so all is good now :). 

I would like to propose some changes to the CMakefile in light of my
experience. I will send them in reply to this email shortly. For your
consideration, please :).

Thank you!
Cheers,
Solomon
> 
> Please let me know if this works.
> Thanks!
> Yordan
> 
> 
> On 20.04.22 г. 3:38 ч., Solomon Tan wrote:
> > On Tue, Feb 09, 2021 at 03:06:14PM +0200, Yordan Karadzhov (VMware) wrote:
> > 
> > Hi Yordan!
> > 
> > I have the same issue of an all-black plots area.
> > 
> > > Ciao Dario,
> > > 
> > > There is a bug in one of the patches from the last patch-set I sent. This
> > > bug was reported by Tzvetomir. My guess is that you are hitting the same
> > > issue. If this is the case you must also have an error message saying
> > > "Unable to find FreeSans font".
> > 
> > I have the same error message. I tried installing the `gnu-free-fonts`
> > package on Arch, but it does not get rid of the error.
> > > 
> > > You can manually do the fix suggested by Tzvetomir (see his reply to [PATCH
> > > 15/24] kernel-shark: Update KsDualMarker and KsGLWidget) or just get a
> > > corrected (rebased) version of the code from
> > > https://github.com/yordan-karadzhov/kernel-shark-v2.beta
> > 
> > I tried installing from your github repo, but the same error still
> > shows. I have all other dependencies installed. FreeSans is the only
> > complaint from the cmake .. command. Is there another potential fix I
> > could try?
> > 
> > > 
> > > Please let me know if this fixes your issue.
> > > Thank you very much for testing and reporting!
> > > 
> > > Best
> > > Yordan
> > 
> > Thank you!
> > Cheers,
> > Solomon