Re: [9fans] Problem with outputing from kernel

[dusan3sic]

https://9p.io/wiki/plan9/avoiding_screen_pollution_from_kernel_messages/index.html
this helped
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[9fans] Problem with outputing from kernel

[dusan3sic]

I added some logs in /sys/src/9/port/proc.c for some tests of the scheduler, I 
want to see at what moments do real time processes take the cpu. I did that 
with simple prints with the intention of doing cat /dev/kmesg > someFile 
because all the prints are stored there.  

The problem is that the flow of output just randomly stops at times and 
continues(only once by test) and i lose some of the output  which is really 
important. Any ideas why?

Also I was doing with tail -f /dev/kmesg in the background and without that 
/dev/kmesg loses the start of output up to some random moment where it shows 
it. Could the problem be that i have too many outputs?
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Re: [9fans] print() in kernel space doesn't work like I would think

[dusan3sic]

I tried actually running some realtime processes and the print msg appeared. 
Thanks
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Re: [9fans] print() in kernel space doesn't work like I would think

[dusan3sic]

> if you don't see this print, you're somehow 
running the wrong kernel.
I can see that.

> this one won't print until you start using
the edf scheduler.
Isn't windowing handled like a realtime process? Does it not start any realtime 
process at boot? I can see that being the problem here. 
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Re: [9fans] print() in kernel space doesn't work like I would think

[dusan3sic]

> also, the steps you used to install and boot the new kernel.

I downloaded img from 9front.
I was changing the source code and building with this script I made
#!/bin/rc

mk install
9fs 9fat
cp /sys/src/9/pc64/9pc64 /n/9fat/9pc64
mk clean
I am running it from /sys/src/9/pc64/
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Re: [9fans] print() in kernel space doesn't work like I would think

[dusan3sic]

> show your diff.

(hint: bind -ac /dist/plan9front / && git/diff /sys/src/9 | webpaste)

diff 66fc6a3e6443d7eb8298f65b0c9803197d196ec7 uncommitted
--- a//sys/src/9/mkfile
+++ b//sys/src/9/mkfile
@@ -1,17 +1,17 @@
ARCH=\
-   bcm\
-   bcm64\
-   cycv\
-   kw\
+   #bcm\
+   #bcm64\
+   #cycv\
+   #kw\
#mtx\
-   omap\
-   pc\
+   #omap\
+   #pc\
pc64\
#ppc\
-   sgi\
-   teg2\
-   xen\
-   zynq\
+   #sgi\
+   #teg2\
+   #xen\
+   #zynq\

all:V:
for(i in $ARCH)@{
--- a//sys/src/9/pc64/main.c
+++ b//sys/src/9/pc64/main.c
@@ -182,7 +182,7 @@
i8250console();
quotefmtinstall();
screeninit();
-   print("\nPlan 9\n");
+   print("\nPlan 69\n");
cpuidentify();
meminit0();
archinit();
--- a//sys/src/9/port/edf.c
+++ b//sys/src/9/port/edf.c
@@ -10,9 +10,10 @@

/* debugging */
enum {
-   Dontprint = 1,
+   Dontprint = 0,
};

+
#define DPRINT  if(Dontprint){}else print

static long now;/* Low order 32 bits of time in µs */
@@ -118,6 +119,7 @@
void
edfinit(Proc*p)
{
+   print("NESTO");
if(!edfinited){
fmtinstall('t', timeconv);
edfinited++;

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Re: [9fans] print() in kernel space doesn't work like I would think

[dusan3sic]

> try
> 
> cat /dev/kmesg
> or
> cat /dev/kprint

/dev/kmesg outputs the boot output I was talking about, but there wasn't my 
print.

dev/kprint doesn't print anything and doesn't let me finish the program. I was 
looking at this 

 and did that but no luck there neither. It says null list concatenation when I 
am booting it and I think it's because $sysname is empty. When I say smth 
random instead of sysname it makes the file but it's still empty. 

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[9fans] print() in kernel space doesn't work like I would think

[dusan3sic]

I was editing plan9's realtime scheduler in /sys/src/9/port/edf.c and was 
trying to add a print to log something, but print didn't show anywhere(or I am 
looking at the wrong place). It has some prints in source code already, with 
this define.
#define DPRINT  if(Dontprint){}else print
And with Dontprint set to 0

I was expecting the output to be at boot time, in boot screen where it asks for 
bootargs, but it wasn't there. I thought it was either the wrong place I am 
looking at or it prints after I start the gui so I don't get to see it. 

Then i tried other prints,  iprint() seemed really cool and usefull but it does 
nothing. It builds ok, but doesn't output anything on serial (on Qemu serial 
window). Also, it didn't work in some user space program I made to test it. 

All I want is to have a normal log system so I can log things on screen.
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[9fans] /dev/realtime doesn't exist?

[dusan3sic]

I was reading an article about plan9's realtime scheduler edf 
(http://doc.cat-v.org/plan_9/real_time/real_time_in_a_real_operating_system/real_time_in_a_real_operating_system.pdf,
 page 7), and they mentioned using /dev/realtime to create realtime processes, 
but /dev/realtime doesn't exist on my machine (I am using 9front). I found a 
post here from 07 saying something about removing it a long time ago, but it 
got no answers. 

In proc(3) they mention some commands for configuring realtime processes but I 
don't know if that is to configure an already made realtime process or to make 
one from a regular. How do i make realtime processes in these days?
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Re: [9fans] Plan9 multi-core support

[dusan3sic]

I am using it in a browser 
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Re: [9fans] Plan9 multi-core support

[dusan3sic]

Btw, how do I reply to someone like you are doing? Copying and quoting manually 
seems weird.
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Re: [9fans] Plan9 multi-core support

[dusan3sic]

I finally read the article about asking questions, sorry if i was being rude or 
was waisting your time, wasn't my intention. 

And about the multi-core support, well I kinda moved away from it since I don't 
really need it, I was just wondering if i can disable it in an easy way for the 
measurement I am doing
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[9fans] Plan9 multi-core support

[dusan3sic]

Does plan9 have multi-core support? If it does, how does it manage it (what 
files/man pages/docs do I read). If it doesn't have, how would I implement it. 
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Re: [9fans] Using 9front as a server

[dusan3sic]

I just ran aux/listen and it worked lol
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[9fans] Using 9front as a server

[dusan3sic]

I want to use my 9front booted from QEMU as a server, so i can transfer files 
from linux to 9front, but it wont open any ports. Help
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Re: [9fans] Any material on processes?

[dusan3sic]

Nice
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[9fans] Any material on processes?

[dusan3sic]

I want to look into process management and how a scheduler works and thing like 
that, but all I can find is inter-process communication with 9P and the rest is 
all just file systems. Any help?
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Re: [9fans] How do I build from source on linux?

[dusan3sic]

I find the system interesting, but I don't seem to be really productive with 
it. I mean i just started using it (as you have already figured out) and I am 
struggling a bit but it seems a lot of fun.
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Re: [9fans] How do I build from source on linux?

[dusan3sic]

Research
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Re: [9fans] How do I build from source on linux?

[dusan3sic]

How do I export the files from Linux to qemu?
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Re: [9fans] How do I build from source on linux?

[dusan3sic]

Well i wanted to do things on Linux since i don't find the environment nice at 
all on 9front and would want to make my life easier by doing it on Linux. Turns 
out not.
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[9fans] How do I build from source on linux?

[dusan3sic]

I run 9front with QEMU and i want to make some changes to it from source and 
than build it and run it on qemu. How do I build it on linux with no mk?
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Re: [9fans] Any interesting topics?

[dusan3sic]

Yes! Thanks a lot!

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[9fans] Any interesting topics?

[dusan3sic]

I wanna make some kind of a research on plan9/9front for fun but can't seem to 
find what topics are interesting these days and what are some flaws that i can 
investigate or something like that? Thanks in advance!
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