| | Date | Mon, 24 Mar 2008 11:31:05 -0700 (PDT) | | From | Christoph Lameter <> | | Subject | Re: [00/14] Virtual Compound Page Support V3 |
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On Sat, 22 Mar 2008, Arjan van de Ven wrote:
> can you document the drawback of large, frequent vmalloc() allocations at least?
Ok. Lets add some documentation about this issue and some other things. A similar suggestion was made by Kosaki-san.
> On 32 bit x86, the effective vmalloc space is 64Mb or so (after various PCI bars are ioremaped), > so if this type of allocation is used for a "scales with nr of ABC" where "ABC" is workload dependent, > there's a rather abrupt upper limit to this. > Not saying that that is a flaw of your patch, just pointing out that we should discourage usage of > the "scales with nr of ABC" (for example "one for each thread") kind of things.
I better take out any patches that do large scale allocs then.
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