On Fri, 24 May 2024 at 02:47, John Groves <John@xxxxxxxxxx> wrote: > Apologies, but I'm short on time at the moment - going into a long holiday > weekend in the US with family plans. I should be focused again by middle of > next week. NP. Obviously I'll need to test it before anything is merged, other than that this is not urgent at all... > But can you check /proc/cmdline to see of the memmap arg got through without > getting mangled? The '$' tends to get fubar'd. You might need \$, or I've seen > the need for \\\$. If it's un-mangled, there should be a dax device. /proc/cmdline shows the option correctly: root@kvm:~# cat /proc/cmdline root=/dev/vda console=hvc0 memmap=4G$4G > If that doesn't work, it's worth trying '!' instead, which I think would give > you a pmem device - if the arg gets through (but ! is less likely to get > horked). That pmem device can be converted to devdax... That doesn't work either. No device created in /dev (dax or pmem). free(1) does show that the reserved memory is gone in both cases, so something does happen. Attaching my .config as well. Thanks, Miklos
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