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June 2017

39 participants
32 discussions

How Kernel command line parameters passed to kernel.
by Madhu K June 1, 2017

June 1, 2017

Hi All, I have a doubt, how kernel command line parameters are passed to kernel space. Before device tree, we used to pass command line parameters using ATAGS. But after device tree we are not using ATAGS. How we are passing command line parameters to kernel space? Thanks & regards, Madhu

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Is vnode number also limit system-wide number of open file?
by Yubin Ruan June 1, 2017

June 1, 2017

I notice that there is a unsigned long i_ino; in definition of `struct inode' [1], which is the virtual filesystem inode. Does that mean "inode number" and is it used for indexing in the system-wide inode table? If that is the case, would that limit the number of open file in Linux? I know there *is* such a limit, and superusers can adjust that by /proc/sys/fs/file-max. Currently I cannot raise that to too high, otherwise the system would crash, which I think is because I have limited memory. But, the point is, if I have lots of memory in my machine (say hunderds of Gigabytes), would the number of open file system-wide limited by the `i_ino' above? Since its type is "unsigned long", I guess I can only open 2^(sizeof(unsigned long)) file simultaneously? -- Yubin [1]: http://elixir.free-electrons.com/linux/latest/source/include/linux/fs.h#L575

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