VFS hot tracking: How to calculate data temperature?

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HI, guys

   VFS hot tracking currently show result as below, and it is very
strange and not nice.

inode #279, reads 0, writes 1, avg read time 18446744073709551615,
avg write time 5251566408153596, temp 109

Do anyone know if there is one simpler but effective way to calculate
data temperature?

-- 
Regards,

Zhi Yong Wu
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