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Questions tagged [linux-kernel]

The Linux kernel is the operating system kernel used by the Linux family of Unix-like operating systems. It is one of the most prominent examples of free and open source software.

The Linux kernel is the operating system kernel used by the Linux family of Unix-like operating systems. It is one of the most prominent examples of free and open source software.

The Linux kernel is released under the GNU General Public License version 2 (GPLv2) (plus some firmware images with various non-free licenses[citation needed]), and is developed by contributors worldwide. Day-to-day development discussions take place on the Linux kernel mailing list.

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Why sudden kernel timestamp jump?

We have several HP ProLiant BL460c Gen8, BIOS I31 06/01/2015 servers running CentOS kernel 2.6.32-358.2.1 and are observing a sudden spike in kernel log timestamp. This is from /var/log/messages: May 19 05:31:58 NWBLWICZVIS-A-VZ-GVS2-01 kernel: [ …
pdp
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How can I tell the kernel to free cached memory during memory allocation request instead of the OOM killer terminating the application

I am running Ubuntu 10.04 with the below kernel version Linux ip-10-0-1-119 2.6.32-343-ec2 #45-Ubuntu SMP Tue Feb 14 18:18:17 UTC 2012 x86_64 GNU/Linux The memory status shows that the cache is using the maximum share of the…
Supratik
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Can't find the pdflush thread?

I just found out there's no pdflush on my Linux, v2.6.38. But when I do a ps uax | grep flush It shows: root 269 0.1 0.0 0 0 ? S 13:05 0:04 [flush-8:0] My kernel is: Linux yonggang-laptop 2.6.38-11-generic #50-Ubuntu…
yonggang
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Will modules installed by insmod command persist after rebooting?

There is how the book I'm reading describe the insmod utility: The program loads the module code and data into the kernel, which, in turn, performs a function similar to that of ld, in that it links any unresolved symbol in the module to…
apache
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watchdog: BUG: soft lockup - CPU#53 stuck for 22s! [kswapd4:543]

My Ubuntu 20.04 server has started complaining: [138070.784987] watchdog: BUG: soft lockup - CPU#53 stuck for 22s! [kswapd4:543] [138070.784999] Modules linked in: ufs qnx4 hfsplus hfs minix ntfs msdos jfs xfs cpuid rpcsec_gss_krb5 nfsv4 nfs fscache…
Ole Tange
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"error: ‘PATH_MAX’ undeclared" when trying to make menuconfig

I have an OVH cloud VPS with Ubuntu 14.04 64 bit server. I needed linux headers which OVH does not provide by default, so I found some tutorials on how to compile the linux kernel from source using the OVH config files, which should allow for…
JohnRDOrazio
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rp_filter kernel setting precedence

When rp_filter kernel setting is configured with different boolean, which takes precedence? all.rp_filter or interface.rp_filter? net.ipv4.conf.all.rp_filter = 1 net.ipv4.conf.default.rp_filter = 1 net.ipv4.conf.eth0.rp_filter = 0
Rama
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How should we understand this 'locked for more than 120 seconds' call trace?

Yesterday a Java service in our Docker Swarm cluster suddenly stopped responding. The task (container) for this service just hung, did not answer any requests, and could not be killed. Looking at /var/log/syslog, we see the following at the time…
sbrattla
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Removing a module currently in use

I want to remove a module currently in use in linux. Module name is say i915 (display module) rmmod i915 shows Module currently in use. Similar output using rmmod -f i915 and it is not dependent on any module. How to go about doing this. Thanks in…
Jatin Kumar
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About kernel upgrade

If I upgrade the kernel,will old binaries use new version of .so or still the old version? UPDATE Why kernel has nothing to do with .so?
kernel
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Linux process scheduling by user?

It seems Linux schedules process execution independently of the user of the process. So, if one user is running 100 processes and another user is running 1 process, in average, the first one will get 100x more CPU time than the second one. Is there…
João M. S. Silva
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Why is the Linux kernel such an important/popular thing? Are there must-know things about it for day-to-day work?

DISCLAIMER: I have been a Windows guy for as long as I can remember, but I now slowly moving to Linux, Docker and Kubernetes (oh, boy!). On Windows I developed and administered commercial applications and seen large-scale solutions. I have never…
Borislav T
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How to enable CONFIG_PREEMPT option in Linux kernel?

I am a new bee in Linux kernel programming, trying to work with an old kernel Linux 2.6.32 on x86_64. I want to enable the CONFIG_PREEMPT option in it but can not find information about how can I do it. I can compile a new kernel with my preferred…
TJ974
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