Re: [Xen-devel] [RFC] Replacing Xen's xmalloc engine and(?) API

[Keir Fraser <keir.fraser@xxxxxxxxxxxxx>]

On 11/10/08 22:44, "Dan Magenheimer" <dan.magenheimer@xxxxxxxxxx> wrote:

> As a result, I'd like to propose a change to the xmalloc interface
> to make this issue more explicit:  I'd like to change xmalloc/xfree
> to FAIL on allocation sizes greater than PAGE_SIZE - DELTA, where
> DELTA is a defined constant.   Callers that require an allocation
> larger than that MUST use the page_alloc (and corresponding
> page_free) interfaces.  In other words, for any dynamic allocation
> code that needs a dynamically computed size that might exceed a
> page, the test must be done on the caller-side... and the caller
> is responsible for remembering whether the subpage allocator or
> the page-plus allocator was used, and free'ing with the matching
> subpage-free or page-plus-free routine.  While I'd never propose
> this unforgiving API for user-land code, I think it isn't unreasonable
> in a hypervisor.

This sounds crazy to me. xmalloc() should work like malloc().

 -- Keir



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