39 lines
1.6 KiB
Plaintext
39 lines
1.6 KiB
Plaintext
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The rcutorture scripting tools automatically create the needed initrd
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directory using dracut. Failing that, this tool will create an initrd
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containing a single statically linked binary named "init" that loops
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over a very long sleep() call. In both cases, this creation is done
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by tools/testing/selftests/rcutorture/bin/mkinitrd.sh.
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However, if you are attempting to run rcutorture on a system that does
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not have dracut installed, and if you don't like the notion of static
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linking, you might wish to press an existing initrd into service:
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------------------------------------------------------------------------
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cd tools/testing/selftests/rcutorture
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zcat /initrd.img > /tmp/initrd.img.zcat
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mkdir initrd
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cd initrd
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cpio -id < /tmp/initrd.img.zcat
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# Manually verify that initrd contains needed binaries and libraries.
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------------------------------------------------------------------------
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Interestingly enough, if you are running rcutorture, you don't really
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need userspace in many cases. Running without userspace has the
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advantage of allowing you to test your kernel independently of the
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distro in place, the root-filesystem layout, and so on. To make this
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happen, put the following script in the initrd's tree's "/init" file,
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with 0755 mode.
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------------------------------------------------------------------------
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#!/bin/sh
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while :
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do
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sleep 10
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done
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------------------------------------------------------------------------
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This approach also allows most of the binaries and libraries in the
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initrd filesystem to be dispensed with, which can save significant
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space in rcutorture's "res" directory.
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