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[PATCH] mm: migration page refcounting fix

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Migration code currently does not take a reference to target page
properly, so between unlocking the pte and trying to take a new
reference to the page with isolate_lru_page, anything could happen to
it.

Fix this by holding the pte lock until we get a chance to elevate the
refcount.

Other small cleanups while we're here.

Signed-off-by: Nick Piggin <[email protected]>
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:
Nick Piggin 2006-01-18 17:42:27 -08:00 • committed by Linus Torvalds
commit 053837fce7
7 changed files with 76 additions and 75 deletions
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26
mm/swap.c
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@ -174,6 +174,32 @@ void lru_add_drain(void)
put_cpu();
}
#ifdef CONFIG_NUMA
static void lru_add_drain_per_cpu(void *dummy)
{
lru_add_drain();
}
/*
* Returns 0 for success
*/
int lru_add_drain_all(void)
{
return schedule_on_each_cpu(lru_add_drain_per_cpu, NULL);
}
#else
/*
* Returns 0 for success
*/
int lru_add_drain_all(void)
{
lru_add_drain();
return 0;
}
#endif
/*
* This path almost never happens for VM activity - pages are normally
* freed via pagevecs. But it gets used by networking.