[Devel] Re: [PATCH v3 07/13] mm: Allocate kernel pages to the right memcg

[Glauber Costa]

On 09/27/2012 05:50 PM, Mel Gorman wrote:
>> +void __free_accounted_pages(struct page *page, unsigned int order)
>> > +{
>> > +	memcg_kmem_uncharge_page(page, order);
>> > +	__free_pages(page, order);
>> > +}
>> > +
>> > +void free_accounted_pages(unsigned long addr, unsigned int order)
>> > +{
>> > +	if (addr != 0) {
>> > +		VM_BUG_ON(!virt_addr_valid((void *)addr));
> This is probably overkill. If it's invalid, the next line is likely to
> blow up anyway. It's no biggie.
> 

So this is here because it is in free_pages() as well. If it blows, at
least we know precisely why (if debugging), and VM_BUG_ON() is only
compiled in when CONFIG_DEBUG_VM.

But I'm fine with either.
Should it stay or should it go ?