Re: Load-on-demand. How does the kernel locate the pages on secondary storage?

["linux-os \(Dick Johnson\)" <linux-os@analogic.com>]

On Wed, 7 Dec 2005, Rik van Riel wrote:

> On Tue, 6 Dec 2005, Mohamed El Dawy wrote:
>
>>  Assume we have a process running, not all the pages of the process
>> are in main memory. Some are swapped, and some are just not loaded
>> yet.
>> How does the kernel locate those pages on disk? Is there a pointer in
>> the page table? or is there some place else? Any pointers to source
>> code in the kernel would be greatly appreciated.
>
> http://linux-mm.org/PageFaultHandling
>
> --
> All Rights Reversed

Look at /usr/src/linux-`uname -r`/mm/swapfile.c scan_swap_map()
for a hint. They are indexed using cluster numbers and it's an easy
index because the swap i/o is in pages.


Cheers,
Dick Johnson
Penguin : Linux version 2.6.13.4 on an i686 machine (5589.55 BogoMips).
Warning : 98.36% of all statistics are fiction.
.

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