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    SubjectRe: [PATCH 2/2] mm,migration: Fix race between shift_arg_pages and rmap_walk by guaranteeing rmap_walk finds PTEs created within the temporary stack

    On Sun, 9 May 2010, Linus Torvalds wrote:
    > IOW, a patch like this (this is a pseudo-patch, totally untested, won't
    > compile, yadda yadda - you need to actually make the people who call
    > "move_page_tables()" call that prepare function first etc etc)

    Btw, that pseudo-patch is also likely the least efficient way to do this,
    since it re-walks the page directories for each pmd it creates.

    Also - the thing is, we can easily choose to do this _just_ for the case
    of shifting argument pages, which really is a special case (the generic
    case of "mremap()" is a lot more complicated, and doesn't have the issue
    with rmap because it's doing all the "new vma" setup etc).


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      Last update: 2010-05-09 22:11    [W:0.020 / U:8.368 seconds]
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