Re: [Qemu-devel] [RFC PATCH 00/21] Trace updates and plugin RFC

[Pavel Dovgalyuk]

> From: Alex Bennée [mailto:address@hidden
> Pavel Dovgalyuk <address@hidden> writes:
> 
> >> From: Alex Bennée [mailto:address@hidden
> >> Any serious analysis tool should allow for us to track all memory
> >> accesses so I think the guest_mem_before trace point should probably
> >> be split into guest_mem_before_store and guest_mem_after_load. We
> >> could go the whole hog and add potential trace points for start/end of
> >> all memory operations.
> >
> > I wanted to ask about memory tracing and found this one.
> > Is it possible to use tracepoints for capturing all memory accesses?
> > In our implementation we insert helpers before and after tcg
> > read/write operations.
> 
> The current tracepoint isn't enough but yes I think we could. The first
> thing I need to do is de-macrofy the atomic helpers a little just to
> make it a bit simpler to add the before/after tracepoints.

But memory accesses can use 'fast path' without the helpers.
Thus you still need inserting the new helper for that case.

Pavel Dovgalyuk