There indeed isn't a ton of detail in TFA, and so I can understand your skepticism. Jeff Baker is an expert on this at Google. Until you've seen the sorts of

There indeed isn't a ton of detail in TFA, and so I can understand your skepticism. Jeff Baker is an expert on this at Google. Until you've seen the sorts of analyses that are conducted inside of Google, it may be hard to appreciate the level of scrutiny that every CPU instruction in tcmalloc has gotten from people like Jeff.