Re: [PATCH] mm: allow huge kvmalloc() calls if they're accounted to memcg

[Paolo Bonzini]

On 16/10/21 17:39, Linus Torvalds wrote:
> The big allocation warnings are not about whether we have the memory
> or not, or about whether it's accounted or not.
> It's about bugs and overflows. Which we've had.

Yes, I understand that...

> At least GFP_NOWARN would be somewhat sensible - although still wrong.

... and it also seemed wrong to overload GFP_NOWARN.

> It should really be about "I've been careful with growing my
> allocations", not about whether accounting or similar should be
> disabled. If the allocations really are expected to be that big, and
> it's actually valid, just do vmalloc(), which doesn't warn.
Sounds good, and you'll get a pull request for that tomorrow.  Then I'll 
send via Andrew a patch to add __vcalloc, so that the accounting is 
restored.

Paolo