RE: kmalloc()'ing greater than 128k

Lee Rhodes (
Wed, 3 Nov 1999 06:28:19 -0500

> Indeed the maximum kmalloc() size is 128k. The maximum size of page
> allocations in 2.2 & 2.3 is 2MB, you should use __get_free_page() &
> free_page().
I assume this allocates single pages (1024 bytes) and I would need to use
__get_free_pages() specifying the best fit. I'll need to track the
allocations though so when it comes to free_page()'ing I use the right
'order' value.

> But vmalloc() should really work just fine, as long as you do
> not try to DMA into it without being careful.
No DMA involved.

> What kernel shows this 'crawling' behavior?
I'm RedHat'ing with 2.2.5-15.

> kmalloc() allocates physically continuous memory as well.
So what are the chances of kmalloc(102400) x 3 and the three malloc'ed areas
being continuous :)?


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