Re: [PATCH bpf 2/2] bpf: use vmalloc with VM_ALLOW_HUGE_VMAP for bpf_prog_pack

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> On Apr 10, 2022, at 11:56 PM, Christoph Hellwig <hch@xxxxxxxxxxxxx> wrote:
> 
> On Sun, Apr 10, 2022 at 01:34:50AM +0000, Song Liu wrote:
>> OTOH, it is probably beneficial for the modules to use something 
>> similar to bpf_prog_pack, i.e., put text from multiple modules to a 
>> single huge page. Of course, this requires non-trivial work in both 
>> mm code and module code.
>> 
>> Given that 1) modules cannot use huge pages yet, and 2) module may
>> use differently (with sharing), I think adding module_alloc_large()
>> doesn't add much value at the moment. So we can just keep this logic
>> in BPF for now. 
>> 
>> Does this make sense?
> 
> I'm not intending to say modules should use the new helper.  But I'd much
> prefer to keep all the MODULES_VADDR related bits self-contained in the
> modules code and not splatter it over random other subsystems.

Got it. Will add that in v2. 

Thanks,
Song





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