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    Subject[PATCH 05/05] mm GFP_ATOMIC comment
    Clarify in comments that GFP_ATOMIC means both "don't sleep"
    and "use emergency pools", hence both ALLOC_DIP_ALOT and
    ALLOC_DIP_SOME.

    Signed-off-by: Paul Jackson <pj@sgi.com>

    ---

    include/linux/gfp.h | 1 +
    mm/page_alloc.c | 3 ++-
    2 files changed, 3 insertions(+), 1 deletion(-)

    --- 2.6.14-mm2.orig/include/linux/gfp.h 2005-11-13 09:57:03.317369370 -0800
    +++ 2.6.14-mm2/include/linux/gfp.h 2005-11-13 10:31:05.590802684 -0800
    @@ -58,6 +58,7 @@ struct vm_area_struct;
    __GFP_NOFAIL|__GFP_NORETRY|__GFP_NO_GROW|__GFP_COMP| \
    __GFP_NOMEMALLOC|__GFP_HARDWALL)

    +/* GFP_ATOMIC means both !wait (__GFP_WAIT not set) and use emergency pool */
    #define GFP_ATOMIC (__GFP_VALID | __GFP_HIGH)
    #define GFP_NOIO (__GFP_VALID | __GFP_WAIT)
    #define GFP_NOFS (__GFP_VALID | __GFP_WAIT | __GFP_IO)
    --- 2.6.14-mm2.orig/mm/page_alloc.c 2005-11-13 10:21:13.804965981 -0800
    +++ 2.6.14-mm2/mm/page_alloc.c 2005-11-13 10:32:33.090792563 -0800
    @@ -926,7 +926,8 @@ restart:
    *
    * The caller may dip into page reserves a bit more if the caller
    * cannot run direct reclaim, or if the caller has realtime scheduling
    - * policy or is asking for __GFP_HIGH memory.
    + * policy or is asking for __GFP_HIGH memory. GFP_ATOMIC requests will
    + * set both ALLOC_DIP_ALOT (!wait) and ALLOC_DIP_SOME (__GFP_HIGH).
    */
    alloc_flags = 0;
    if ((unlikely(rt_task(p)) && !in_interrupt()) || !wait)
    --
    I won't rest till it's the best ...
    Programmer, Linux Scalability
    Paul Jackson <pj@sgi.com> 1.650.933.1373
    -
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