Hi!
On 15:49 Sat 22 Nov , Peter Teoh wrote:
> when a process mmap() a section of a file into its own process memory,
> the process memory will maintain a copy of the data of that section of
> the file.
>
> but then this is pagecache which cache the physically opened file, right?
>
> so...does there exists duplicated buffering? (one in kernel -
> pagecache, and one in userspace - for mmap() content of the file in
> process memory)
>
> Correct? So so...then it looks like a lot of duplicated stuff .....
When multiple programs load the same libraries into memory, they are mmap()ed
and shared. I cannot tell you exactly, but I do not think that the files exist
in an mmap() space and in the page cache. However, I have heared that readahead
and page reclaim is differently.
-Michi
--
programing a layer 3+4 network protocol for mesh networks
see http://michaelblizek.twilightparadox.com
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