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trace: Use portable format strings
It is not portable to use "%ld" for int64_t because int64_t may havetype long on 64-bit platforms and long long on 32-bit platforms. Usethe standard library PRId64 macros to keep format strings portable.
Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>...
trace: Add user documentation
Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>