Re: explanation of page in and page cache hit
Re: explanation of page in and page cache hit
- Subject: Re: explanation of page in and page cache hit
- From: Shawn Erickson <email@hidden>
- Date: Thu, 10 Dec 2009 15:03:17 -0800
On Thu, Dec 10, 2009 at 1:08 PM, Joel Reymont <email@hidden> wrote:
> ---
> Page In: A nonresident page was read from disk.
> Page Cache Hit: A resident, but unmapped page was touched.
> ---
>
> Does a page become resident but unmapped after a page-in?
Don't think so (if I understand what you are asking). A page-in makes
it both resident and mapped for the requesting process.
> What is a resident, but unmapped page?
IIRC the need page exists in physical memory already but it isn't
currently mapped into the requesting process.
-Shawn
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