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* [PATCH v2] mm: cma: NUMA node interface
@ 2020-04-02 21:58 Aslan Bakirov
  2020-04-02 22:07 ` Matthew Wilcox
  0 siblings, 1 reply; 3+ messages in thread
From: Aslan Bakirov @ 2020-04-02 21:58 UTC (permalink / raw)
  To: akpm
  Cc: linux-kernel, linux-mm, kernel-team, riel, guro, mhocko, hannes,
	Aslan Bakirov

I've noticed that there is no interfaces exposed by CMA which would let me
to declare contigous memory on particular NUMA node.

This patchset adds the ability to try to allocate contiguous memory on
specific node. It will fallback to other nodes if the specified one
doesn't work.

Implement a new method for declaring contigous memory on particular node
and keep cma_declare_contiguous() as a wrapper.

Signed-off-by: Aslan Bakirov <aslan@fb.com>
---
 include/linux/cma.h      | 14 ++++++++++++--
 include/linux/memblock.h |  3 +++
 mm/cma.c                 | 15 ++++++++-------
 mm/memblock.c            |  2 +-
 4 files changed, 24 insertions(+), 10 deletions(-)

diff --git a/include/linux/cma.h b/include/linux/cma.h
index 190184b5ff32..9512229744e0 100644
--- a/include/linux/cma.h
+++ 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);
+			}
 extern int cma_init_reserved_mem(phys_addr_t base, phys_addr_t size,
 					unsigned int order_per_bit,
 					const char *name,
diff --git a/include/linux/memblock.h b/include/linux/memblock.h
index 079d17d96410..f5878ed25e6e 100644
--- a/include/linux/memblock.h
+++ b/include/linux/memblock.h
@@ -348,6 +348,9 @@ static inline int memblock_get_region_node(const struct memblock_region *r)
 
 phys_addr_t memblock_phys_alloc_range(phys_addr_t size, phys_addr_t align,
 				      phys_addr_t start, phys_addr_t end);
+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);
 phys_addr_t memblock_phys_alloc_try_nid(phys_addr_t size, phys_addr_t align, int nid);
 
 static inline phys_addr_t memblock_phys_alloc(phys_addr_t size,
diff --git a/mm/cma.c b/mm/cma.c
index be55d1988c67..2300669b4253 100644
--- a/mm/cma.c
+++ b/mm/cma.c
@@ -220,7 +220,7 @@ int __init cma_init_reserved_mem(phys_addr_t base, phys_addr_t size,
 }
 
 /**
- * cma_declare_contiguous() - reserve custom contiguous area
+ * cma_declare_contiguous_nid() - reserve custom contiguous area
  * @base: Base address of the reserved area optional, use 0 for any
  * @size: Size of the reserved area (in bytes),
  * @limit: End address of the reserved memory (optional, 0 for any).
@@ -229,6 +229,7 @@ int __init cma_init_reserved_mem(phys_addr_t base, phys_addr_t size,
  * @fixed: hint about where to place the reserved area
  * @name: The name of the area. See function cma_init_reserved_mem()
  * @res_cma: Pointer to store the created cma region.
+ * @nid: nid of the free area to find, %NUMA_NO_NODE for any node
  *
  * This function reserves memory from early allocator. It should be
  * called by arch specific code once the early allocator (memblock or bootmem)
@@ -238,10 +239,10 @@ int __init cma_init_reserved_mem(phys_addr_t base, phys_addr_t size,
  * If @fixed is true, reserve contiguous area at exactly @base.  If false,
  * reserve in range from @base to @limit.
  */
-int __init cma_declare_contiguous(phys_addr_t base,
+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)
 {
 	phys_addr_t memblock_end = memblock_end_of_DRAM();
 	phys_addr_t highmem_start;
@@ -336,14 +337,14 @@ int __init cma_declare_contiguous(phys_addr_t base,
 		 * memory in case of failure.
 		 */
 		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);
 			limit = highmem_start;
 		}
 
 		if (!addr) {
-			addr = memblock_phys_alloc_range(size, alignment, base,
-							 limit);
+			addr = memblock_alloc_range_nid(size, alignment, base,
+							 limit, nid, false);
 			if (!addr) {
 				ret = -ENOMEM;
 				goto err;
diff --git a/mm/memblock.c b/mm/memblock.c
index 4d06bbaded0f..c79ba6f9920c 100644
--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -1349,7 +1349,7 @@ __next_mem_pfn_range_in_zone(u64 *idx, struct zone *zone,
  * Return:
  * Physical address of allocated memory block on success, %0 on failure.
  */
-static phys_addr_t __init memblock_alloc_range_nid(phys_addr_t size,
+phys_addr_t __init 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)
-- 
2.24.1



^ permalink raw reply related	[flat|nested] 3+ messages in thread

* Re: [PATCH v2] mm: cma: NUMA node interface
  2020-04-02 21:58 [PATCH v2] mm: cma: NUMA node interface Aslan Bakirov
@ 2020-04-02 22:07 ` Matthew Wilcox
  2020-04-02 22:26   ` Aslan Bakirov
  0 siblings, 1 reply; 3+ messages in thread
From: Matthew Wilcox @ 2020-04-02 22:07 UTC (permalink / raw)
  To: Aslan Bakirov
  Cc: akpm, linux-kernel, linux-mm, kernel-team, riel, guro, mhocko, hannes

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?

> +++ 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?

> +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);



^ permalink raw reply	[flat|nested] 3+ messages in thread

* Re: [PATCH v2] mm: cma: NUMA node interface
  2020-04-02 22:07 ` Matthew Wilcox
@ 2020-04-02 22:26   ` Aslan Bakirov
  0 siblings, 0 replies; 3+ messages in thread
From: Aslan Bakirov @ 2020-04-02 22:26 UTC (permalink / raw)
  To: Matthew Wilcox
  Cc: Aslan Bakirov, akpm, linux-kernel, linux-mm, kernel-team, riel,
	Roman Gushchin, mhocko, hannes

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On Thu, Apr 2, 2020 at 11:07 PM Matthew Wilcox <willy@infradead.org> 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.


>
> > +++ 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);
>
>
>

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^ permalink raw reply	[flat|nested] 3+ messages in thread

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2020-04-02 22:07 ` Matthew Wilcox
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