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). - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
