Re: [RFC][PATCH] release mmap_sem before starting migration (WasRe: Need to take mmap_sem lock in move_pages.

[Christoph Lameter]

On Wed, 4 Feb 2009, KAMEZAWA Hiroyuki wrote:

> mmap_sem can be released after page table walk ends.

No. read lock on mmap_sem must be held since the migrate functions
manipulate page table entries. Concurrent large scale changes to the page
tables (splitting vmas, remapping etc) must not be possible.


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