扩大Linux内核日志缓冲区超过2M [英] Enlarge Linux Kernel Log Buffer more that 2M

问题描述

我正在收集某种Linux内核活动.我在内核源代码中放置了多个printk语句，并希望在常规内核活动期间对其进行监视.不幸的是，我意识到内核日志缓冲区的大小(CONFIG_LOG_BUF_SHIFT)不能大于2 ^ 21，这基本上等于2M条目.

I am in the process of collecting some sort of Linux Kernel activities. I have placed multiple printk statements with in the kernel source code and would like to monitor those during regular kernel activities. Unfortunately, I have realized that the Kernel Log Buffer size (CONFIG_LOG_BUF_SHIFT) cannot be more that 2^21 which is essentially equal to 2M entries.

还有其他方法可以记录超过2M的内核消息吗?

Is there any other way to record more than 2M Kernel messages ?

推荐答案

您可以在/boot/grub/grub.conf中将内核日志缓冲区设置为log_buf_len=4M.这应将日志缓冲区的大小增加到4 MiB.请注意，您还可以在引导过程中编辑grub，并将log_buf_len=4M附加在以kernel ...开头的行的末尾.

You can set the kernel log buffer to log_buf_len=4M in your /boot/grub/grub.conf. This should increase the log buffer size to 4 MiB. Note you can also edit the grub during boot, and append the log_buf_len=4M at the end of the line starting with the kernel ....

CONFIG_LOG_BUF_SHIFT显示的是内核日志缓冲区的默认大小，而不是最大大小，您可以将其设置为更大的值，但需要重新编译内核.

CONFIG_LOG_BUF_SHIFT shows the default size of the kernel log buffer not the maximum size, you can set this to larger value but would require to recompile the kernel.

ex:
2 ^ 19 = 512 KiB
2 ^ 20 = 1 MiB
2 ^ 21 = 2 MiB
2 ^ 22 = 4 MiB

您正在使用哪种口味或Linux内核版本，这在SuSE和RHEL上都能很好地工作.

Which flavor or kernel version of Linux are you on, this works well on SuSE and RHEL.

这篇关于扩大Linux内核日志缓冲区超过2M的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！