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SubjectRe: shm swapping in 2.4 again
Hi Rik,

On Thu, 16 Nov 2000, Rik van Riel wrote:
> On 16 Nov 2000, Christoph Rohland wrote:
>> So in shm_swap_out I check if the page is already in the swap
>> cache. If not I put the page into it and note the swap entry in
>> the shadow pte of shm. Right?
> Exactly. And I'll change page_launder() to:
> 1. write dirty swap cache pages to disk
> 2. do some IO clustering (maybe) or rely on luck ;)
>> So does the page live all the time in the swap cache? This would
>> lead to a vastly increased swap usage since we would have to
>> preallocate the swap entries on page allocation.
> If the usage count of the swap entry is 1 (all users of the
> page have swapped it in and the swap cache is the only user),
> then we can free the page from swap and the swap cache.

Great. So what do we have to do to get this done? The shm stuff sounds
pretty easy.


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