From: Timur Tabi <timur.tabi@ammasso.com>
To: linux-mm@kvack.org
Subject: Don't understand vm_page_prot
Date: Fri, 03 Sep 2004 10:40:40 -0500 [thread overview]
Message-ID: <41389078.1080900@ammasso.com> (raw)
I'm reading about vm_area_struct in Mel Gorman's book on the Linux VM,
and he says that the vm_page_prot field in structure vm_area_struct
contains "protection flags that are set for each PTE in this VMA". These
are the _PAGE_xxx flags in pgtable.h.
The problem I have is that these flags describe individual pages. For
instance, _PAGE_DIRTY says that this particular page is dirty. So what
does it mean if _PAGE_DIRTY is set in vm_page_prot? Does that mean that
every page in this VMA is dirty? What if only some of the pages are dirty?
--
Timur Tabi
Staff Software Engineer
timur.tabi@ammasso.com
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reply other threads:[~2004-09-03 15:38 UTC|newest]
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