Re: [RFC] [PATCH 00/19] Non disruptive application core dumpinfrastructure using task_work_add()

[Andi Kleen]

> > Couldn't they just use the new process_vm_readv() syscalls instead?
> > AFAIK those do not require ptrace.
> > 
> We need the register set and hence would need a ptrace.

But the kernel needs to stop to to read the registers.

Do you have data how much the latency difference is between
an optimized ptrace reader (using PTRACE_GETREGSET) vs the kernel ?

-Andi
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