Re: CPU data cache across reboot/kexec for pmem/dax devices

2024-02-13 Thread Mathieu Desnoyers
On 2024-02-09 15:15, Dan Williams wrote: Mathieu Desnoyers wrote: Hi Dan, In the context of extracting user-space trace data when the kernel crashes, the LTTng user-space tracer recommends using nvdimm/pmem to reserve an area of physical (volatile) RAM at boot (memmap=nn[KMG]!ss[KMG]), and use

RE: CPU data cache across reboot/kexec for pmem/dax devices

2024-02-09 Thread Dan Williams
Mathieu Desnoyers wrote: > Hi Dan, > > In the context of extracting user-space trace data when the kernel crashes, > the LTTng user-space tracer recommends using nvdimm/pmem to reserve an area > of physical (volatile) RAM at boot (memmap=nn[KMG]!ss[KMG]), and use the > resulting device to create/m

CPU data cache across reboot/kexec for pmem/dax devices

2024-02-09 Thread Mathieu Desnoyers
Hi Dan, In the context of extracting user-space trace data when the kernel crashes, the LTTng user-space tracer recommends using nvdimm/pmem to reserve an area of physical (volatile) RAM at boot (memmap=nn[KMG]!ss[KMG]), and use the resulting device to create/mount a dax-enabled fs (e.g. ext4).