add boot partition size

hc

2023-12-11 d2ccde1c8e90d38cee87a1b0309ad2827f3fd30d

 kernel/tools/testing/selftests/rcutorture/doc/rcu-test-image.txt
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@@ -1,8 +1,33 @@
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-This document describes one way to create the rcu-test-image file
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-that contains the filesystem used by the guest-OS kernel.  There are
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-probably much better ways of doing this, and this filesystem could no
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-doubt be smaller.  It is probably also possible to simply download
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-an appropriate image from any number of places.
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+Normally, a minimal initrd is created automatically by the rcutorture
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+scripting.  But minimal really does mean "minimal", namely just a single
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+root directory with a single statically linked executable named "init":
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+
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+$ size tools/testing/selftests/rcutorture/initrd/init
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+   text    data     bss     dec     hex filename
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+    328       0       8     336     150 tools/testing/selftests/rcutorture/initrd/init
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+
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+Suppose you need to run some scripts, perhaps to monitor or control
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+some aspect of the rcutorture testing.  This will require a more fully
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+filled-out userspace, perhaps containing libraries, executables for
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+the shell and other utilities, and soforth.  In that case, place your
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+desired filesystem here:
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+
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+	tools/testing/selftests/rcutorture/initrd
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+
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+For example, your tools/testing/selftests/rcutorture/initrd/init might
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+be a script that does any needed mount operations and starts whatever
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+scripts need starting to properly monitor or control your testing.
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+The next rcutorture build will then incorporate this filesystem into
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+the kernel image that is passed to qemu.
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+
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+Or maybe you need a real root filesystem for some reason, in which case
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+please read on!
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+
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+The remainder of this document describes one way to create the
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+rcu-test-image file that contains the filesystem used by the guest-OS
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+kernel.  There are probably much better ways of doing this, and this
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+filesystem could no doubt be smaller.  It is probably also possible to
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+simply download an appropriate image from any number of places.
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 That said, here are the commands:
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33
 
..
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@@ -36,7 +61,7 @@
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 	https://help.ubuntu.com/community/JeOSVMBuilder
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 	http://wiki.libvirt.org/page/UbuntuKVMWalkthrough
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 	http://www.moe.co.uk/2011/01/07/pci_add_option_rom-failed-to-find-romfile-pxe-rtl8139-bin/ -- "apt-get install kvm-pxe"
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-	http://www.landley.net/writing/rootfs-howto.html
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-	http://en.wikipedia.org/wiki/Initrd
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-	http://en.wikipedia.org/wiki/Cpio
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+	https://www.landley.net/writing/rootfs-howto.html
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+	https://en.wikipedia.org/wiki/Initrd
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+	https://en.wikipedia.org/wiki/Cpio
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 	http://wiki.libvirt.org/page/UbuntuKVMWalkthrough