On Tue, 23 Oct 2007, Pekka Enberg wrote:
> On 10/23/07, Christoph Lameter <[email protected]> wrote:
> > Not sure what this is. Maybe the slowing SLUB solves the race.
>
> What kind of race are you thinking of? What I initially thought was
> that the problem is that SLUB messes up some other VM heuristics due
> to different object sizes, not holding on to empty slabs, and/or page
> allocator pass-through. I guess only object size is affected by
> debugging, though?
The number of objects per page is reduced by enabling full debugging. That
triggers a potential of more order 1 allocations but we are failing at
order 0 allocs. slub_debug=F does not increase object size with debugging
information but keeps things as they are while doing as much verification
of slab integrity as possible.
One--potentially far fetched theory--is that the difference in alloc
performance may trigger a race. But I guess it is more likely that we will
find something wrong with the gfp flags (that I recategorized for 2.6.24).
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