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Matt Stancliff authored
used_memory_peak only updates in serverCron every server.hz, but Redis can use more memory and a user can request memory INFO before used_memory_peak gets updated in the next cron run. This patch updates used_memory_peak to the current memory usage if the current memory usage is higher than the recorded used_memory_peak value. (And it only calls zmalloc_used_memory() once instead of twice as it was doing before.)
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