* migration failure in 3.10 kernel
@ 2016-07-19 22:53 Zhan Chen
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From: Zhan Chen @ 2016-07-19 22:53 UTC (permalink / raw)
To: n-horiguchi; +Cc: linux-mm
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Hi Naoya,
I encounter the issue that page migration fails due to page ref count != 1
thus return -EAGAIN in migrate_page_move_mapping().
And it turns out that in page fault handling, __migration_entry_wait()
calls get_page_unless_zero() to get an extra ref count before
wait_on_page_locked().
Is there a fix that can safely wait for migration to complete without
taking the ref on page?
Thanks.
-Zhan
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2016-07-19 22:53 migration failure in 3.10 kernel Zhan Chen
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