Kernel Module not printing to dmesg until proc file is read [closed]Linux kernel module file sizePPP kernel module fails to loadIs this server missing the kvm kernel module?Cannot compile tape kernel module/var/log/messages showing lots of CE Err=0x2000 even on unused banks (slots)Linux: Why does the CPU frequency fluctuate when using the performance governor?Centos iptables: No chain/target/match by that nameHow to build configfs kernel module externallyKernel headers not found in Cent OS 7Failed to find Linux Kernel Module
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Kernel Module not printing to dmesg until proc file is read [closed]
Linux kernel module file sizePPP kernel module fails to loadIs this server missing the kvm kernel module?Cannot compile tape kernel module/var/log/messages showing lots of CE Err=0x2000 even on unused banks (slots)Linux: Why does the CPU frequency fluctuate when using the performance governor?Centos iptables: No chain/target/match by that nameHow to build configfs kernel module externallyKernel headers not found in Cent OS 7Failed to find Linux Kernel Module
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I'm trying to write a kernel module that will log some TCP values. Reading the output from /proc/net/tcpstat (the out of the module) is problematic as I do not want to lose info. After adding some printk to module I noticed something very strange: The printk in the init routine is fine. BUT: other printk will not print until /proc/net/tcpstat is read (using more, cat, or the like).
I really don't need /proc/net/tcpstat - just want to log some info.
After reading this post I made sure that all printk messages are ending with "n" but still it won't print to dmesg until the proc file is read.
linux-kernel kernel-modules
asked Apr 24 at 9:09
nmnirnmnir
101
closed as off-topic by womble♦ Apr 25 at 3:46
This question appears to be off-topic. The users who voted to close gave this specific reason:
- "Questions on Server Fault must be about managing information technology systems in a business environment. Home and end-user computing questions may be asked on Super User, and questions about development, testing and development tools may be asked on Stack Overflow." – womble
|
show 1 more comment
I'm trying to write a kernel module that will log some TCP values. Reading the output from /proc/net/tcpstat (the out of the module) is problematic as I do not want to lose info. After adding some printk to module I noticed something very strange: The printk in the init routine is fine. BUT: other printk will not print until /proc/net/tcpstat is read (using more, cat, or the like).
I really don't need /proc/net/tcpstat - just want to log some info.
After reading this post I made sure that all printk messages are ending with "n" but still it won't print to dmesg until the proc file is read.
linux-kernel kernel-modules
asked Apr 24 at 9:09
nmnirnmnir
101
closed as off-topic by womble♦ Apr 25 at 3:46
This question appears to be off-topic. The users who voted to close gave this specific reason:
- "Questions on Server Fault must be about managing information technology systems in a business environment. Home and end-user computing questions may be asked on Super User, and questions about development, testing and development tools may be asked on Stack Overflow." – womble
What TCP information do you want?
– John Mahowald
Apr 24 at 23:38
information from the stack. retrans, snd window size, rcv window size, and much more that are not in netstat, ss, etc..
– nmnir
Apr 25 at 10:10
Edit your question to include what your problem is, and specifically what you want to measure. You can determine some of this with packet capture or tracing the kernel.
– John Mahowald
Apr 25 at 17:53
@JohnMahowald my question is not about how to measure and what to measure. it is about why there are prints to dmesg only if I check /proc/file
– nmnir
Apr 25 at 20:33
The development of such a kernel module is more of a question for Stack Overflow. Pick one. As you already have cross posted there, this question should be edited or closed. Further, good questions at either site have a clear problem statement as to what you are trying to do.
– John Mahowald
Apr 26 at 11:13
|
show 1 more comment
I'm trying to write a kernel module that will log some TCP values. Reading the output from /proc/net/tcpstat (the out of the module) is problematic as I do not want to lose info. After adding some printk to module I noticed something very strange: The printk in the init routine is fine. BUT: other printk will not print until /proc/net/tcpstat is read (using more, cat, or the like).
I really don't need /proc/net/tcpstat - just want to log some info.
After reading this post I made sure that all printk messages are ending with "n" but still it won't print to dmesg until the proc file is read.
linux-kernel kernel-modules
asked Apr 24 at 9:09
nmnirnmnir
101
I'm trying to write a kernel module that will log some TCP values. Reading the output from /proc/net/tcpstat (the out of the module) is problematic as I do not want to lose info. After adding some printk to module I noticed something very strange: The printk in the init routine is fine. BUT: other printk will not print until /proc/net/tcpstat is read (using more, cat, or the like).
I really don't need /proc/net/tcpstat - just want to log some info.
After reading this post I made sure that all printk messages are ending with "n" but still it won't print to dmesg until the proc file is read.
linux-kernel kernel-modules
linux-kernel kernel-modules
asked Apr 24 at 9:09
nmnirnmnir
101
asked Apr 24 at 9:09
nmnirnmnir
101
asked Apr 24 at 9:09
nmnirnmnir
101
asked Apr 24 at 9:09
nmnirnmnir
101
asked Apr 24 at 9:09
nmnirnmnir
101
101
closed as off-topic by womble♦ Apr 25 at 3:46
This question appears to be off-topic. The users who voted to close gave this specific reason:
- "Questions on Server Fault must be about managing information technology systems in a business environment. Home and end-user computing questions may be asked on Super User, and questions about development, testing and development tools may be asked on Stack Overflow." – womble
closed as off-topic by womble♦ Apr 25 at 3:46
This question appears to be off-topic. The users who voted to close gave this specific reason:
- "Questions on Server Fault must be about managing information technology systems in a business environment. Home and end-user computing questions may be asked on Super User, and questions about development, testing and development tools may be asked on Stack Overflow." – womble
What TCP information do you want?
– John Mahowald
Apr 24 at 23:38
information from the stack. retrans, snd window size, rcv window size, and much more that are not in netstat, ss, etc..
– nmnir
Apr 25 at 10:10
Edit your question to include what your problem is, and specifically what you want to measure. You can determine some of this with packet capture or tracing the kernel.
– John Mahowald
Apr 25 at 17:53
@JohnMahowald my question is not about how to measure and what to measure. it is about why there are prints to dmesg only if I check /proc/file
– nmnir
Apr 25 at 20:33
The development of such a kernel module is more of a question for Stack Overflow. Pick one. As you already have cross posted there, this question should be edited or closed. Further, good questions at either site have a clear problem statement as to what you are trying to do.
– John Mahowald
Apr 26 at 11:13
|
show 1 more comment
What TCP information do you want?
– John Mahowald
Apr 24 at 23:38
information from the stack. retrans, snd window size, rcv window size, and much more that are not in netstat, ss, etc..
– nmnir
Apr 25 at 10:10
Edit your question to include what your problem is, and specifically what you want to measure. You can determine some of this with packet capture or tracing the kernel.
– John Mahowald
Apr 25 at 17:53
@JohnMahowald my question is not about how to measure and what to measure. it is about why there are prints to dmesg only if I check /proc/file
– nmnir
Apr 25 at 20:33
The development of such a kernel module is more of a question for Stack Overflow. Pick one. As you already have cross posted there, this question should be edited or closed. Further, good questions at either site have a clear problem statement as to what you are trying to do.
– John Mahowald
Apr 26 at 11:13
What TCP information do you want?
– John Mahowald
Apr 24 at 23:38
What TCP information do you want?
– John Mahowald
Apr 24 at 23:38
information from the stack. retrans, snd window size, rcv window size, and much more that are not in netstat, ss, etc..
– nmnir
Apr 25 at 10:10
information from the stack. retrans, snd window size, rcv window size, and much more that are not in netstat, ss, etc..
– nmnir
Apr 25 at 10:10
Edit your question to include what your problem is, and specifically what you want to measure. You can determine some of this with packet capture or tracing the kernel.
– John Mahowald
Apr 25 at 17:53
Edit your question to include what your problem is, and specifically what you want to measure. You can determine some of this with packet capture or tracing the kernel.
– John Mahowald
Apr 25 at 17:53
@JohnMahowald my question is not about how to measure and what to measure. it is about why there are prints to dmesg only if I check /proc/file
– nmnir
Apr 25 at 20:33
@JohnMahowald my question is not about how to measure and what to measure. it is about why there are prints to dmesg only if I check /proc/file
– nmnir
Apr 25 at 20:33
The development of such a kernel module is more of a question for Stack Overflow. Pick one. As you already have cross posted there, this question should be edited or closed. Further, good questions at either site have a clear problem statement as to what you are trying to do.
– John Mahowald
Apr 26 at 11:13
The development of such a kernel module is more of a question for Stack Overflow. Pick one. As you already have cross posted there, this question should be edited or closed. Further, good questions at either site have a clear problem statement as to what you are trying to do.
– John Mahowald
Apr 26 at 11:13
|
show 1 more comment
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What TCP information do you want?
– John Mahowald
Apr 24 at 23:38
information from the stack. retrans, snd window size, rcv window size, and much more that are not in netstat, ss, etc..
– nmnir
Apr 25 at 10:10
Edit your question to include what your problem is, and specifically what you want to measure. You can determine some of this with packet capture or tracing the kernel.
– John Mahowald
Apr 25 at 17:53
@JohnMahowald my question is not about how to measure and what to measure. it is about why there are prints to dmesg only if I check /proc/file
– nmnir
Apr 25 at 20:33
The development of such a kernel module is more of a question for Stack Overflow. Pick one. As you already have cross posted there, this question should be edited or closed. Further, good questions at either site have a clear problem statement as to what you are trying to do.
– John Mahowald
Apr 26 at 11:13