Messages in this thread | | | Date | Thu, 5 Nov 2009 10:10:56 -0500 (EST) | From | Christoph Lameter <> | Subject | Re: [MM] Make mm counters per cpu instead of atomic |
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On Thu, 5 Nov 2009, KAMEZAWA Hiroyuki wrote:
> Hmm, I don't fully understand _new_ percpu but... > In logical (even if not realistic), x86-32 supports up to 512 ? cpus in Kconfig. > BIGSMP.
x86-32 only supports 32 processors. Plus per cpu areas are only allocated for the possible processors.
> Then, if 65536 process runs, this consumes > > 65536(nr_proc) * 8 (size) * 512(cpus) = 256MBytes.
With 32 possible cpus this results in 16m of per cpu space use.
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