Vipin Sharma <vipinsh@xxxxxxxxxx> writes:
On Thu, Mar 16, 2023 at 3:29 PM Colton Lewis <coltonlewis@xxxxxxxxxx> wrote:
Provide a generic function to read the system counter from the guest for timing purposes. A common and important way to measure guest performance is to measure the amount of time different actions take in the guest. Provide also a mathematical conversion from cycles to nanoseconds and a macro for timing individual statements.
Substitute the previous custom implementation of a similar function in
May be specify specific name: guest_read_system_counter()
Will do.
+#define MEASURE_CYCLES(x) \ + ({ \ + uint64_t start; \ + start = cycles_read(); \ + x; \ + cycles_read() - start; \ + }) +
MEASURE_CYCLES should be moved to the next patch where it is getting used. Does it have to be macro or can it be replaced with a function?
Will move to the next patch. It can't be replaced by a function because then 'x' would be executed before the function begins and there would be nothing left to measure.
