Messages in this thread | | | Date | Sat, 4 Feb 2006 12:54:15 -0800 | From | "Barry K. Nathan" <> | Subject | Re: [ANNOUNCE] Linux Kernel Useful Patches (2.4) |
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On 2/4/06, Willy TARREAU <willy@w.ods.org> wrote: > The last O(1) patch I've seen does not apply to kernels more recent than 2.4.19 > (it's on Ingo's site). Do you have any up to date pointer that I could use ? > However, I have a local rediff of the lowlat patch that I will include.
(This e-mail ended up being a bit longer than I intended. The most relevant stuff may be in the last couple of paragraphs, but I've included the whole message for the sake of completeness.)
Red Hat ships it in a 2.4.21-based kernel. Here's their latest source RPM: ftp://ftp.redhat.com/pub/redhat/linux/updates/enterprise/3AS/en/os/SRPMS/kernel-2.4.21-37.0.1.EL.src.rpm
However, I just remembered that the RHEL 3 kernel patch series starts with an -ac patch and builds up from there. I think it gets the O(1) scheduler from there but it might apply further patches to it (but I'm not 100% sure my memory is correct here).
Here's the last -ac patch: http://kernel.org/pub/linux/kernel/people/alan/linux-2.4/2.4.22/patch-2.4.22-ac4.bz2
If you want to see what Red Hat/Fedora did against 2.4.22, this is what the final Fedora Core 1 kernel shipped: http://cvs.fedora.redhat.com/viewcvs/rpms/kernel/FC-1/ (There are newer kernels for FC1 from Fedora Legacy, but I think those just add security fixes.)
There's also 2.4.27-pre2-pac1, which has the O(1) scheduler. I don't know if it introduces any bugs into the O(1) scheduler though. (It did introduce a bug into the overcommit accounting, because part of it was missing.) http://kernel.org/pub/linux/kernel/people/bero/2.4/2.4.27/patch-2.4.27-pre2-pac1.bz2
Finally, 2.4.31-lck1 has the O(1) scheduler. This is the "base" patch for 2.4.31-lck1, which has O(1) but also has "kernel preemption, low latency and CK interactivity": http://www.plumlocosoft.com/kernel/patches/2.4/2.4.31/2.4.31-lck1/components/010-lckbase.diff.bz2
It's probably the most recent forward-port of the O(1) patch, and it's probably going to be the smallest diff to look through as well, if you want to cherry-pick it out and make it work on 2.4.32 or 2.4.33-pre. (I don't think I'll be doing this, however. The boxes I manage that would greatly benefit from O(1) will probably move to kernel 2.6 soon for other reasons anyway.) -- -Barry K. Nathan <barryn@pobox.com> - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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