A while ago I committed the linuxulator D-Trace probes I talked about earlier. I waited a little bit for this announcement to make sure I have not broken anything. Nobody complained so far, so I assume nothing obviously bad crept in.
The >500 probes I committed do not cover the entire linuxulator, but are a good start. Adding new ones is straight forward, if someone is interested in a junior–kernel–hacker task, this would be one. Just ask me (or ask on emulation@), and I can guide you through it.
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Tags: current,
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gt 500,
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Seems I forgot to announce that the linux_base-c6 is in the Ports Collection now. Well, it is not a replacement for the current default linux base, the linuxulator infrastructure ports are missing and we need to check if the kernel supports enough of 2.6.18 that nothing breaks.
TODO:
To my knowledge, nobody is working on anything of this. Anyone is welcome to have a look and provide patches.
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Tags: c6,
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This weekend I made some progress in the linuxulator:
- I MFCed the reporting of some linux-syscalls to 9-stable and 8-stable.
- I updated my linuxulator-dtrace patch to a recent -current. I already compiled it on i386 and arundel@ has it compiled on amd64. I counted more than 500 new DTrace probes. Now that DTrace rescans for SDT probes when a kernel module is loaded, there is no kernel panic anymore when the linux module is loaded after the DTrace modules and you want to use DTrace. I try to commit this at a morning of a day where I can fix things during the day in case some problems show up which I did not notice during my testing.
- I created a PR for portmgr@ to repocopy a new linux_base port.
- I set the expiration date of linux_base-fc4 (only used by 7.x and upstream way past its EoL) and all dependent ports. It is set to the EoL of the last 7.x release, which can not use a later linux_base port. I also added a comment which explains that the date is the EoL of the last 7.x release.
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Tags: amd64,
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linux module,
ports,
probes,
stable —
Last weekend I committed some dummy-syscalls to the linuxulator in FreeBSD-current. I also added some comments to syscalls.master which should give a hint which linux kernel had them for the first time (if the linux man–page I looked this up in is correct). So if someone wants to experiment with a higher compat.linux.osrelease than 2.6.16 (as it is needed for a CentOS based linux_base), he should now get some kernel messages about unimplemented syscalls instead of a silent failure.
There may be some low-hanging fruits in there, but I did not really verify this by checking what the dummy syscalls are supposed to do in linux and if we can easily map this to existing FreeBSD features. In case someone has a look, please send an email to emulation@FreeBSD.org.
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Tags: compat,
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It seems my HOWTO create a new linux_base port was not too bad. There is now a PR for a CentOS 6 based linux_base port. I had a quick look at it and it seems that it is nearly usable to include into the Ports Collection (the SRPMs need to be added, but that can be done within some minutes).
When FreeBSD 8.3 is released and the Ports Collection open for sweeping commits again, I will ask portmgr to do a repo-copy for the new port and commit it. This is just the linux_base port, not the complete infrastructure which is needed to completely replace the current default linuxulator userland. This is just a start. The process of switching to a more recent linux_base port is a long process, and in this case depends upon enough support in the supported FreeBSD releases.
Attention: Anyone installing the port from the PR should be aware that using it is a highly experimental task. You need to change the linuxulator to impersonate himself as a linux 2.6.18 kernel (described in the pkg-message of the port), and the code in FreeBSD is far from supporting this. Anyone who wants to try it is welcome, but you have to run FreeBSD-current as of at least the last weekend, and watch out for kernel messages about unsupported syscalls. Reports to emulation@FreeBSD.org please, not here on the webpage.
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Tags: centos linux,
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