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    SubjectRe: refill_inactive()
    On Mon, 25 Sep 2000, Ingo Molnar wrote:
    >
    > On Mon, 25 Sep 2000, Rik van Riel wrote:
    >
    > > 2) you are right, we /can/ schedule when __GFP_IO isn't set, this is
    > > mistake ... now I'm getting confused about what __GFP_IO is all
    > > about, does anybody know the _exact_ meaning of __GFP_IO ?
    >
    > __GFP_IO set to 1 means that the allocator can afford doing IO implicitly
    > by the page allocator. Most allocations dont care at all wether swap IO is
    > started as part of gfp() or not. But a prominent counter-example is
    > GFP_BUFFER, which is used by the buffer-cache/fs layer, and which cannot
    > do any IO implicitly. (because it *is* the IO layer already, and it is
    > already trying to do IO.) The other reason are legacy lowlevel-filesystem
    > locks like the ext2fs lock, which cannot be taken recursively.

    Hmmm, doesn't GFP_BUFFER simply imply that we cannot
    allocate new buffer heads to do IO with??

    (from reading buffer.c, I can't see much of a reason
    why we couldn't start write IO on already allocated
    buffers...)

    regards,

    Rik
    --
    "What you're running that piece of shit Gnome?!?!"
    -- Miguel de Icaza, UKUUG 2000

    http://www.conectiva.com/ http://www.surriel.com/

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