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    SubjectRe: CPU hotplug broken with 2GB VMSPLIT
    On Fri, Dec 01 2006, Shaohua Li wrote:
    > On Fri, 2006-12-01 at 01:20 +0800, Nathan Lynch wrote:
    > > Nathan Lynch wrote:
    > > > Jens Axboe wrote:
    > > > > On Thu, Nov 30 2006, Jens Axboe wrote:
    > > > > > Hi,
    > > > > >
    > > > > > Just got a new notebook (Lenovo X60), setup a custom kernel and
    > > then I
    > > > > > noticed that suspend to ram doesn't work anymore. The machine
    > > suspends
    > > > > > just fine, on resume it brings back the text display but reboots
    > > after
    > > > > > it has stalled for a few seconds. On the suggestion of Pavel, I
    > > tried
    > > > > > testing CPU hotplug, and indeed he was right: I can offline 1 of
    > > the
    > > > > > cores fine, bringing it back online freezes the machine for 3-4
    > > seconds
    > > > > > and then reboots.
    > > > > >
    > > > > > carl:/sys/devices/system/cpu/cpu1 # echo 0 > online
    > > > > > carl:/sys/devices/system/cpu/cpu1 # dmesg
    > > > > > Breaking affinity for irq 219
    > > > > > CPU 1 is now offline
    > > > > > SMP alternatives: switching to UP code
    > > > > > carl:/sys/devices/system/cpu/cpu1 # echo 1 > online
    > > > > > Read from remote host carl: Connection reset by peer
    > > > > >
    > > > > > Booting with maxcpus=1 and resume works fine. Does this ring a
    > > bell with
    > > > > > anyone? With highmem enabled and the standard vmsplit, cpu
    > > hotplug works
    > > > > > fine for me.
    > > > >
    > > > > Some more clues - booting with noreplacement doesn't fix it, so I
    > > think
    > > > > the alternatives code is off the hook.
    > > >
    > > > I don't think this adds any new information, but it has been open
    > > > awhile:
    > > >
    > > > http://bugme.osdl.org/show_bug.cgi?id=6542
    > > >
    > > > I was able to narrow it down to the vmsplit setting but I wasn't
    > > able
    > > > to debug it further.
    > >
    > > Hmm, I'm pretty sure this is the same problem I reported in March,
    > > there might be some more information in that thread:
    > >
    > > http://marc.theaimsgroup.com/?t=114039363100002&r=1&w=1
    > >
    > > but I didn't realize it was vmsplit-related at that time.
    > Does this patch help?

    It does! Booted a vmsplit 2G kernel again, and started with offlining
    and onlining CPU1. Worked fine, that would previously reboot the
    notebook. Then I did a suspend-to-ram -> resume cycle, worked fine as
    well. Thanks!

    --
    Jens Axboe

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