On Thu, Apr 2, 2020 at 11:07 PM Matthew Wilcox <willy@xxxxxxxxxxxxx> wrote:
On Thu, Apr 02, 2020 at 02:58:10PM -0700, Aslan Bakirov wrote:
> I've noticed that there is no interfaces exposed by CMA which would let me
> to declare contigous memory on particular NUMA node.
Do you have a user for this functionality?
Yes, we are using this functionality in second part of this patchset, We use this interface
in hugetlb_cma_reserve() to reserve CMA on specific node.
in hugetlb_cma_reserve() to reserve CMA on specific node.
> +++ b/include/linux/cma.h
> @@ -24,10 +24,20 @@ extern phys_addr_t cma_get_base(const struct cma *cma);
> extern unsigned long cma_get_size(const struct cma *cma);
> extern const char *cma_get_name(const struct cma *cma);
>
> -extern int __init cma_declare_contiguous(phys_addr_t base,
> +extern int __init cma_declare_contiguous_nid(phys_addr_t base,
> phys_addr_t size, phys_addr_t limit,
> phys_addr_t alignment, unsigned int order_per_bit,
> - bool fixed, const char *name, struct cma **res_cma);
> + bool fixed, const char *name, struct cma **res_cma,
> + int nid);
> +static inline int __init cma_declare_contiguous(phys_addr_t base,
> + phys_addr_t size, phys_addr_t limit,
> + phys_addr_t alignment, unsigned int order_per_bit,
> + bool fixed, const char *name, struct cma **res_cma)
> + {
> + return cma_declare_contiguous_nid(base, size,
> + limit, alignment, order_per_bit,
> + fixed, name, res_cma, NUMA_NO_NODE);
> + }
... what even is this indentation?
Sorry, about indentation problems, fix is coming in the next version.
> +phys_addr_t memblock_alloc_range_nid(phys_addr_t size,
> + phys_addr_t align, phys_addr_t start,
> + phys_addr_t end, int nid, bool exact_nid);
>80 columns. checkpatch should warn you of nits like this.
> if (base < highmem_start && limit > highmem_start) {
> - addr = memblock_phys_alloc_range(size, alignment,
> - highmem_start, limit);
> + addr = memblock_alloc_range_nid(size, alignment,
> + highmem_start, limit, nid, false);
The deep indentation makes it hard to add new parameters. I'd do it as:
addr = memblock_alloc_range_nid(size, alignment,
highmem_start, limit, nid, false);
