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[PATCH] Swapless page migration: modify core logic

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Use the migration entries for page migration

This modifies the migration code to use the new migration entries.  It now
becomes possible to migrate anonymous pages without having to add a swap
entry.

We add a couple of new functions to replace migration entries with the proper
ptes.

We cannot take the tree_lock for migrating anonymous pages anymore.  However,
we know that we hold the only remaining reference to the page when the page
count reaches 1.

Signed-off-by: Christoph Lameter <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Christoph Lameter 2006-06-23 02:03:37 -07:00 • committed by Linus Torvalds
commit 6c5240ae7f
2 changed files with 23 additions and 34 deletions
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4
mm/Kconfig
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@ -138,8 +138,8 @@ config SPLIT_PTLOCK_CPUS
#
config MIGRATION
bool "Page migration"
def_bool y if NUMA
depends on SWAP && NUMA
def_bool y
depends on NUMA
help
Allows the migration of the physical location of pages of processes
while the virtual addresses are not changed. This is useful for