swap_free() inside delete_from_swap_cache

swap_free() inside delete_from_swap_cache

[Raghu R. Arur]

 Why is swap_free() called inside delete_from_swap_cache() in linux 
2.4.19? I believe delete_from_swap_cache() is called when we write a page 
to the swap disk. swap_free() decreases the count of number of references 
to that page. I am not understanding why should we decrement the count of 
references when we are swapping the page to the disk.

 Thanks,
 Raghu


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Re: swap_free() inside delete_from_swap_cache

[Rik van Riel]

On Fri, 5 Sep 2003, Raghu R. Arur wrote:

>  Why is swap_free() called inside delete_from_swap_cache() in linux
> 2.4.19? I believe delete_from_swap_cache() is called when we write a
> page to the swap disk. swap_free() decreases the count of number of
> references to that page.

The swap cache itself has one of the references to the location
on swap. 

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