lkml.org 
[lkml]   [2007]   [May]   [4]   [last100]   RSS Feed
Views: [more markup]  [less markup]  [headers]  [forward] 
 
Messages in this thread
/
DateFri, 4 May 2007 09:23:04 -0700 (PDT)
FromChristoph Lameter <>
SubjectRe: [PATCH 08/40] mm: kmem_cache_objsize
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/

\
 
 \ /
  Last update: 2007-05-04 18:25    [from the cache]
©2003-2008