Re: Implement lookup_swap_cache for migration entries

On Fri, 14 Apr 2006, Andrew Morton wrote:

> So we're doing a get_page() on a random page which could be in any state -
> it could be on the freelists, or in the per-cpu pages arrays, it could have
> been reused for something else.

Hmmm... Yes, Ahh! The tree_lock prohibits this sort of thing from 
happening to regular pages. Right.... Yuck this could be expensive to fix.

We are holding the anon_vma lock while remapping migration ptes. So we 
could take the anonvma lock, check to see if the pte is still a migration
pte if so then it cannot change and we can safely increase page 
count.
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• References:
  • [PATCH 0/5] Swapless page migration V2: Overview
    • From: Christoph Lameter <[email protected]>
  • [PATCH 2/5] Swapless V2: Add migration swap entries
    • From: Christoph Lameter <[email protected]>
  • Re: [PATCH 2/5] Swapless V2: Add migration swap entries
    • From: Andrew Morton <[email protected]>
  • Re: [PATCH 2/5] Swapless V2: Add migration swap entries
    • From: Christoph Lameter <[email protected]>
  • Re: [PATCH 2/5] Swapless V2: Add migration swap entries
    • From: Andrew Morton <[email protected]>
  • Re: [PATCH 2/5] Swapless V2: Add migration swap entries
    • From: Christoph Lameter <[email protected]>
  • Re: [PATCH 2/5] Swapless V2: Add migration swap entries
    • From: Andrew Morton <[email protected]>
  • Re: [PATCH 2/5] Swapless V2: Add migration swap entries
    • From: Christoph Lameter <[email protected]>
  • Re: [PATCH 2/5] Swapless V2: Add migration swap entries
    • From: Andrew Morton <[email protected]>
  • Implement lookup_swap_cache for migration entries
    • From: Christoph Lameter <[email protected]>
  • Re: Implement lookup_swap_cache for migration entries
    • From: Andrew Morton <[email protected]>
  • Re: Implement lookup_swap_cache for migration entries
    • From: Christoph Lameter <[email protected]>
  • Re: Implement lookup_swap_cache for migration entries
    • From: Andrew Morton <[email protected]>
  • Re: Implement lookup_swap_cache for migration entries
    • From: Christoph Lameter <[email protected]>
  • Re: Implement lookup_swap_cache for migration entries
    • From: Andrew Morton <[email protected]>

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