memory-mapping and updating cached content in RAM question

To: "users@xxxxxxxxxxxxxxxx" <users@xxxxxxxxxxxxxxxx>
Subject: memory-mapping and updating cached content in RAM question
From: "Rose, John B" <jbrose@xxxxxxx>
Date: Fri, 19 Dec 2014 19:30:31 +0000
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Red Hat 7 Apache 2.4.6

Filesystem is local

How does updating the cache in RAM of frequently viewed pages with
MMapFile work if you change sections of

the page frequently, but say 75% of page stays the same?  Like calendar

Items on the page. Or news releases. Since that is common nowadays. 

Do we have to restart Apache to update the cache?

Thanks

Follow-Ups:
- Re: memory-mapping and updating cached content in RAM question
  - From: Eric Covener