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    SubjectRe: [PATCH 04/10] mm: slub: add knowledge of reserve pages
    On Wed, 8 Aug 2007, Andrew Morton wrote:

    > 3. Perform page reclaim from hard IRQ context. Pretty simple to
    > implement, most of the work would be needed in the rmap code. It might be
    > better to make it opt-in via a new __GFP_flag.

    In a hardirq context one is bound to a processor and through the slab
    allocator to a slab from which one allocates objects. The slab is per cpu
    and so the slab is reserved for the current context. Nothing can take
    objects away from it. The modifications here would not be needed for that
    context.

    I think in general irq context reclaim is doable. Cannot see obvious
    issues on a first superficial pass through rmap.c. The irq holdoff would
    be pretty long though which may make it unacceptable.

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