> Can you share what the libfabric change would look like to add a
> timestamp field to the completion? That might be informative,
> libfabric is also consuming the kernel UAPI.
Libfabric uses a CQ format option. so this would just require a new format.
There is no type checking on CQ poll (read). The provider interface looks like
this:
struct fi_ops_cq {
size_t size;
ssize_t (*read)(struct fid_cq *cq, void *buf, size_t count);
ssize_t (*readfrom)(struct fid_cq *cq, void *buf, size_t count,
fi_addr_t *src_addr);
(We could construct static inline calls with type checking if someone wanted
that.)
If I were adding timestamps, I would probably define a new completion structure
with 2 u64 time stamp fields (start and end times), and figure out when start
occurred, end occurred, and the timing metric later. :)
I would assume that these are non-wrapping values.
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