Messages in this thread | | | Date | Sun, 20 Oct 2013 18:08:44 +0000 | From | Christoph Lameter <> | Subject | Re: [PATCH v2 3/5] slab: restrict the number of objects in a slab |
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On Sat, 19 Oct 2013, JoonSoo Kim wrote:
> > Ok so that results in a mininum size object size of 2^(12 - 8) = 2^4 == > > 16 bytes on x86. This is not true for order 1 pages (which SLAB also > > supports) where we need 32 bytes. > > According to current slab size calculating logic, slab whose object size is > less or equal to 16 bytes use only order 0 page. So there is no problem.
Ok then lets add a VM_BUG_ON to detect the situation when someone tries something different.
> > Problems may arise on PPC or IA64 where the page size may be larger than > > 64K. With 64K we have a mininum size of 2^(16 - 8) = 256 bytes. For those > > arches we may need 16 bit sized indexes. Maybe make that compile time > > determined base on page size? > 64KByte results in 16 bit sized indexes? > > Okay. I will try it.
Again compile time. You had runtime in some earlier patches which adds new branches to key functions.
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