Re: [Linux-ia64] kmalloc() and page sizes

David Mosberger
2002-01-10T19:56:06Z

>>>>> On Thu, 10 Jan 2002 11:18:49 +0100, Christian Hildner <christian.hildner@hob.de> said:

Christian> Hi all! In the current kernels the size limit for
Christian> kmalloc() is 128KB. The ia64 architecture provides
Christian> pagesizes ranging from 4K, ... , 64K, 256K, ... , 4G. If
Christian> we would increase the maximum kmalloc() size limit to
Christian> 256K (or 1M) this would match perfectly to the pagesizes.

Christian> Since I need a large (256K) segment from kmalloc(), I
Christian> would appreciate the increase of the size limit. Maybe
Christian> also other 64Bit architectures could benefit from that.

Christian> Please tell your opinion to the list.

Is there a reason you can't use alloc_pages() directly? It can handle
allocation orders of up to 10 (not that you'll find many chunks of
that size!). The slab allocator is limited to an allocation order of
5, as you observed.

--david