[RFC] asm code for Hypervisor Call Instrumentation
paulus at samba.org
Mon Aug 7 16:26:24 EST 2006
Mike Kravetz writes:
> This patch is built on top of Anton's hcall cleanup patch. One
> remaining issue is 'where should the statistic data structures
> be updated?'. For simplicity, I have the asm code call the
> following C routine to perform the updates.
Hmmm, doing the update in assembly would avoid the need to create a
stack frame, which would be nice... Maybe we need to add some macros
to include/asm-powerpc/percpu.h to make it easier to access per-cpu
variables from assembly code.
Alternatively, we could put a pointer to the hcall_stats array for
each cpu in its paca. That's very easily accessed from assembly code.
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