Messages in this thread | | | Date | Thu, 8 Apr 2004 11:57:10 +1000 | From | David Gibson <> | Subject | Re: RFC: COW for hugepages |
| |
On Wed, Apr 07, 2004 at 06:29:54PM +1000, Benjamin Herrenschmidt wrote: > On Wed, 2004-04-07 at 17:53, Andrew Morton wrote: > > David Gibson <david@gibson.dropbear.id.au> wrote: > > > > > > Doing the COW for hugepages turns out not to be terribly difficult. > > > Is there any reason not to apply this patch? > > > > Not much, except that it adds stuff to the kernel. > > > > Does anyone actually have a real-world need for the feature? > > Yup, porting some apps to use hugepages, when those apps > rely on fork & cow semantics typically. Also, implicit use of > hugepages (usually via a malloc override library).
I also have some experimental patches for putting ELF segments into large pages (for HPC FORTRAN monsters with massive arrays in the BSS). MAP_PRIVATE semantics (and hence COW) are a clear prerequisite for that.
-- David Gibson | For every complex problem there is a david AT gibson.dropbear.id.au | solution which is simple, neat and | wrong. http://www.ozlabs.org/people/dgibson - 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/
| |