[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH][2/17] USB virt 2.6 split driver---xenidc buffer resource provider
On 22 Nov 2005, at 10:55, Muli Ben-Yehuda wrote: I don't understand this. I thought vmalloc was more likely to besuccessful than kmalloc because the memory doesn't need to be contiguousso I thought it was preferable to use vmalloc when possible.Nope, vmalloc has both a resource usage issue (we only have a limited vmalloc space) and some small overhead that kmalloc doesn't. The only time you should use vmalloc is if you know that kmalloc can't give you a large enough buffer. If the buffer is > PAGE_SIZE, you should use vmalloc if at all possible. Order != 0 allocations can easily fail on a churned box with lots of memory fragmentation. -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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