On Wed, 19 Sep 2007, Eric Dumazet wrote:
> 1) Only power of two allocations are good candidates, or we waste RAM
Correct.
> 2) On i386 machines, we have a small vmalloc window. (128 MB default value)
> Many servers with >4GB memory (PAE) like to boot with vmalloc=32M option to get 992MB of LOWMEM.
> If we allow some slub caches to fallback to vmalloc land, we'll have problems to tune this.
We would first do the vmalloc conversion to GFP_VFALLBACK which would
reduce the vmalloc requirements of drivers and core significantly. The
patchset should actually reduce the vmalloc space requirements
significantly. They are only needed in situations where the page allocator
cannot provide a contiguous mapping and that gets rarer the better Mel's
antifrag code works.
> 4) vmalloc() currently uses a linked list of vm_struct. Might need something more scalable.
If its rarely used then its not that big of a deal. The better the anti
fragmentation measures the less vmalloc use.
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