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migration: fix xbzrle encoding rate calculation
It's reported an error of implicit conversion from "unsigned long" to
"double" when compiling with Clang 10. Simply make the encoding rate 0
when the encoded_size is 0.
Fixes: e460a4b1a4
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reported-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Wei Wang <wei.w.wang@intel.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20200617201309.1640952-3-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
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@ -913,10 +913,8 @@ static void migration_update_rates(RAMState *rs, int64_t end_time)
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unencoded_size = (xbzrle_counters.pages - rs->xbzrle_pages_prev) *
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TARGET_PAGE_SIZE;
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encoded_size = xbzrle_counters.bytes - rs->xbzrle_bytes_prev;
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if (xbzrle_counters.pages == rs->xbzrle_pages_prev) {
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if (xbzrle_counters.pages == rs->xbzrle_pages_prev || !encoded_size) {
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xbzrle_counters.encoding_rate = 0;
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} else if (!encoded_size) {
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xbzrle_counters.encoding_rate = UINT64_MAX;
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} else {
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xbzrle_counters.encoding_rate = unencoded_size / encoded_size;
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}
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