Subject: Re: [RFC] powerpc/hugetlb: Add warning message when gpage allocation request fails

From: "Aneesh Kumar K.V" <[email-masked]>
Date: Mon, 14 Sep 2015 18:59:25 +0530

Anshuman Khandual <[email-masked]> writes:

> When a 16GB huge page is requested on POWER platform through kernel command
> line interface, it silently fails because of the lack of any gigantic pages
> on the system which the platform should have communicated through 16GB memory
> blocks in the device tree during boot time. For example
>
> [    0.480940] HugeTLB registered 16 GB page size, pre-allocated 0 pages
> [    0.480945] HugeTLB registered 16 MB page size, pre-allocated 16 pages
>
> This adds a warning message during alloc_bootmem_huge_page request both on
> book3e and book3s powerpc platforms. After this change
>
> [    0.000000] Gigantic HugeTLB page not available
> [    0.473417] HugeTLB registered 16 GB page size, pre-allocated 0 pages
> [    0.473423] HugeTLB registered 16 MB page size, pre-allocated 16 pages

That info is already part of the second line isn't it ? ie

[    0.473417] HugeTLB registered 16 GB page size, pre-allocated 0 pages

pre-allocated 0 pages indicate we didn't allocate anything. So why do we
need to add more details fo kernel output ?

-aneesh