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When will kalloc() return NULL?

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When will kalloc() return NULL?

Subject: When will kalloc() return NULL?
From: Stacey <email@hidden>
Date: Fri, 09 May 2008 13:12:08 -0500

Hi,

Given kalloc(size) where 0 < size < kalloc_max_pre_rounded (small enough to be handled by zalloc)...

When it is safe to assume that kalloc(size) (aka. kalloc_canblock(size, TRUE)) will never return NULL or, in other words, block until memory resources are available? I see examples in the Xnu code that make both assumptions.

If it is never safe to assume kalloc(size) will never return NULL is there a kernel memory allocator call that will block until memory is available.

Sorry if this question has been asked before.

Thanks in advance,

-stacey.
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