Should a swapped out page be deleted from swap cache?

[Will Huck]

On 02/20/2013 03:06 AM, Hugh Dickins wrote:
> On Tue, 19 Feb 2013, Will Huck wrote:
>> Another question:
> I don't see the connection to deleting a swapped out page from swap cache.
>
>> Why kernel memory mapping use direct mapping instead of kmalloc/vmalloc which
>> will setup mapping on demand?
> I may misunderstand you, and "kernel memory mapping".
>
> kmalloc does not set up a mapping, it uses the direct mapping already set up.
>
> It would be circular if the basic page allocation primitives used kmalloc,
> since kmalloc relies on the basic page allocation primitives.
>
> vmalloc is less efficient than using the direct mapping (repeated setup
> and teardown, no use of hugepages), but necessary when you want a larger

Is there tlb flush in setup and teardown process? and they also expensive?

> virtual array than you're likely to find from the buddy allocator.
>
> Hugh