Messages in this thread | | | Date | Fri, 4 May 2007 09:23:04 -0700 (PDT) | From | Christoph Lameter <> | Subject | Re: [PATCH 08/40] mm: kmem_cache_objsize |
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On Fri, 4 May 2007, Peter Zijlstra wrote:
> On Fri, 2007-05-04 at 09:09 -0700, Christoph Lameter wrote: > > On Fri, 4 May 2007, Pekka Enberg wrote: > > > > > On 5/4/07, Peter Zijlstra <a.p.zijlstra@chello.nl> wrote: > > > > Expost buffer_size in order to allow fair estimates on the actual space > > > > used/needed. > > > > We already have ksize? > > ksize gives the internal size, whereas these give the external size. > > I need to know how much space I need to reserve, hence I need the > external size; whereas normally you want to know how much space you have > available, which is what ksize gives. > > Didn't we have this discussion last time?
I was cced on that as far as I can tell.
The name objsize suggests the size of the object not the slab size. If you want this then maybe call it kmem_cache_slab_size. SLUB distinguishes between obj_size which is the size of the struct that is used and slab_size which is the size of the object after alignment, adding debug information etc etc. See also slabinfo.c for a way to calculate theses sizes from user space.
If we really drop SLAB then we wont need this. SLUBs data structures are not opaque. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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