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Date: Wed, 25 Sep 2019 14:52:28 +0800
From: Yunfeng Ye <yeyunfeng@...wei.com>
To: Mike Rapoport <rppt@...ux.ibm.com>
CC: <richardw.yang@...ux.intel.com>, <akpm@...ux-foundation.org>,
<osalvador@...e.de>, <mhocko@...e.co>, <dan.j.williams@...el.com>,
<david@...hat.com>, <cai@....pw>, <linux-mm@...ck.org>,
<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V2] mm: Support memblock alloc on the exact node for
sparse_buffer_init()
On 2019/9/25 14:36, Mike Rapoport wrote:
> On Tue, Sep 24, 2019 at 04:09:32PM +0800, Yunfeng Ye wrote:
>> sparse_buffer_init() use memblock_alloc_try_nid_raw() to allocate memory
>> for page management structure, if memory allocation fails from specified
>> node, it will fall back to allocate from other nodes.
>>
>> Normally, the page management structure will not exceed 2% of the total
>> memory, but a large continuous block of allocation is needed. In most
>> cases, memory allocation from the specified node will success always,
>> but a node memory become highly fragmented will fail. we expect to
>> allocate memory base section rather than by allocating a large block of
>> memory from other NUMA nodes
>>
>> Add memblock_alloc_exact_nid_raw() for this situation, which allocate
>> boot memory block on the exact node. If a large contiguous block memory
>> allocate fail in sparse_buffer_init(), it will fall back to allocate
>> small block memory base section.
>>
>> Signed-off-by: Yunfeng Ye <yeyunfeng@...wei.com>
>> ---
>> v1 -> v2:
>> - use memblock_alloc_exact_nid_raw() rather than using a flag
>>
>> include/linux/memblock.h | 3 +++
>> mm/memblock.c | 66 ++++++++++++++++++++++++++++++++++++++++--------
>> mm/sparse.c | 2 +-
>> 3 files changed, 59 insertions(+), 12 deletions(-)
>>
>> diff --git a/include/linux/memblock.h b/include/linux/memblock.h
>> index f491690..b38bbef 100644
>> --- a/include/linux/memblock.h
>> +++ b/include/linux/memblock.h
>> @@ -358,6 +358,9 @@ static inline phys_addr_t memblock_phys_alloc(phys_addr_t size,
>> MEMBLOCK_ALLOC_ACCESSIBLE);
>> }
>>
>> +void *memblock_alloc_exact_nid_raw(phys_addr_t size, phys_addr_t align,
>> + phys_addr_t min_addr, phys_addr_t max_addr,
>> + int nid);
>> void *memblock_alloc_try_nid_raw(phys_addr_t size, phys_addr_t align,
>> phys_addr_t min_addr, phys_addr_t max_addr,
>> int nid);
>> diff --git a/mm/memblock.c b/mm/memblock.c
>> index 7d4f61a..a71869e 100644
>> --- a/mm/memblock.c
>> +++ b/mm/memblock.c
>> @@ -1323,12 +1323,13 @@ __next_mem_pfn_range_in_zone(u64 *idx, struct zone *zone,
>> * @start: the lower bound of the memory region to allocate (phys address)
>> * @end: the upper bound of the memory region to allocate (phys address)
>> * @nid: nid of the free area to find, %NUMA_NO_NODE for any node
>> + * @need_exact_nid: control the allocation fall back to other nodes
>> *
>> * The allocation is performed from memory region limited by
>> * memblock.current_limit if @max_addr == %MEMBLOCK_ALLOC_ACCESSIBLE.
>> *
>> - * If the specified node can not hold the requested memory the
>> - * allocation falls back to any node in the system
>> + * If the specified node can not hold the requested memory and @need_exact_nid
>> + * is zero, the allocation falls back to any node in the system
>> *
>> * For systems with memory mirroring, the allocation is attempted first
>> * from the regions with mirroring enabled and then retried from any
>> @@ -1342,7 +1343,8 @@ __next_mem_pfn_range_in_zone(u64 *idx, struct zone *zone,
>> */
>> static 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)
>> + phys_addr_t end, int nid,
>> + int need_exact_nid)
>
> Please make it 'bool exact_nid'
>
ok, I will modify as your suggestion, thanks.
>> {
>> enum memblock_flags flags = choose_memblock_flags();
>> phys_addr_t found;
>> @@ -1365,7 +1367,7 @@ static phys_addr_t __init memblock_alloc_range_nid(phys_addr_t size,
>> if (found && !memblock_reserve(found, size))
>> goto done;
>>
>> - if (nid != NUMA_NO_NODE) {
>> + if (nid != NUMA_NO_NODE && !need_exact_nid) {
>> found = memblock_find_in_range_node(size, align, start,
>> end, NUMA_NO_NODE,
>> flags);
>> @@ -1413,7 +1415,8 @@ phys_addr_t __init memblock_phys_alloc_range(phys_addr_t size,
>> phys_addr_t start,
>> phys_addr_t end)
>> {
>> - return memblock_alloc_range_nid(size, align, start, end, NUMA_NO_NODE);
>> + return memblock_alloc_range_nid(size, align, start, end, NUMA_NO_NODE,
>> + 0);
>> }
>>
>> /**
>> @@ -1432,7 +1435,7 @@ phys_addr_t __init memblock_phys_alloc_range(phys_addr_t size,
>> phys_addr_t __init memblock_phys_alloc_try_nid(phys_addr_t size, phys_addr_t align, int nid)
>> {
>> return memblock_alloc_range_nid(size, align, 0,
>> - MEMBLOCK_ALLOC_ACCESSIBLE, nid);
>> + MEMBLOCK_ALLOC_ACCESSIBLE, nid, 0);
>> }
>>
>> /**
>> @@ -1442,6 +1445,7 @@ phys_addr_t __init memblock_phys_alloc_try_nid(phys_addr_t size, phys_addr_t ali
>> * @min_addr: the lower bound of the memory region to allocate (phys address)
>> * @max_addr: the upper bound of the memory region to allocate (phys address)
>> * @nid: nid of the free area to find, %NUMA_NO_NODE for any node
>> + * @need_exact_nid: control the allocation fall back to other nodes
>> *
>> * Allocates memory block using memblock_alloc_range_nid() and
>> * converts the returned physical address to virtual.
>> @@ -1457,7 +1461,7 @@ phys_addr_t __init memblock_phys_alloc_try_nid(phys_addr_t size, phys_addr_t ali
>> static void * __init memblock_alloc_internal(
>> phys_addr_t size, phys_addr_t align,
>> phys_addr_t min_addr, phys_addr_t max_addr,
>> - int nid)
>> + int nid, int need_exact_nid)
>
> Ditto.
>
>> {
>> phys_addr_t alloc;
>>
>> @@ -1469,11 +1473,13 @@ static void * __init memblock_alloc_internal(
>> if (WARN_ON_ONCE(slab_is_available()))
>> return kzalloc_node(size, GFP_NOWAIT, nid);
>>
>> - alloc = memblock_alloc_range_nid(size, align, min_addr, max_addr, nid);
>> + alloc = memblock_alloc_range_nid(size, align, min_addr, max_addr, nid,
>> + need_exact_nid);
>>
>> /* retry allocation without lower limit */
>> if (!alloc && min_addr)
>> - alloc = memblock_alloc_range_nid(size, align, 0, max_addr, nid);
>> + alloc = memblock_alloc_range_nid(size, align, 0, max_addr, nid,
>> + need_exact_nid);
>>
>> if (!alloc)
>> return NULL;
>> @@ -1482,6 +1488,44 @@ static void * __init memblock_alloc_internal(
>> }
>>
>> /**
>> + * memblock_alloc_exact_nid_raw - allocate boot memory block on the exact node,
>> + * without zeroing memory and without panicking
>
> No need to mention "without panicking" as none of the memblock APIs panic
> any more.
>
ok, I will remove the comment "without panicking" as your suggestion, thanks.
>> + * @size: size of memory block to be allocated in bytes
>> + * @align: alignment of the region and block's size
>> + * @min_addr: the lower bound of the memory region from where the allocation
>> + * is preferred (phys address)
>> + * @max_addr: the upper bound of the memory region from where the allocation
>> + * is preferred (phys address), or %MEMBLOCK_ALLOC_ACCESSIBLE to
>> + * allocate only from memory limited by memblock.current_limit value
>> + * @nid: nid of the free area to find, %NUMA_NO_NODE for any node
>> + *
>> + * Public function, provides additional debug information (including caller
>> + * info), if enabled. Does not zero allocated memory, does not panic if request
>> + * cannot be satisfied.
>> + *
>> + * Return:
>> + * Virtual address of allocated memory block on success, NULL on failure.
>> + */
>> +void * __init memblock_alloc_exact_nid_raw(
>> + phys_addr_t size, phys_addr_t align,
>> + phys_addr_t min_addr, phys_addr_t max_addr,
>> + int nid)
>> +{
>> + void *ptr;
>> +
>> + memblock_dbg("%s: %llu bytes align=0x%llx nid=%d from=%pa max_addr=%pa %pS\n",
>> + __func__, (u64)size, (u64)align, nid, &min_addr,
>> + &max_addr, (void *)_RET_IP_);
>> +
>> + ptr = memblock_alloc_internal(size, align,
>> + min_addr, max_addr, nid, 1);
>> + if (ptr && size > 0)
>> + page_init_poison(ptr, size);
>> +
>> + return ptr;
>> +}
>> +
>> +/**
>> * memblock_alloc_try_nid_raw - allocate boot memory block without zeroing
>> * memory and without panicking
>> * @size: size of memory block to be allocated in bytes
>> @@ -1512,7 +1556,7 @@ void * __init memblock_alloc_try_nid_raw(
>> &max_addr, (void *)_RET_IP_);
>>
>> ptr = memblock_alloc_internal(size, align,
>> - min_addr, max_addr, nid);
>> + min_addr, max_addr, nid, 0);
>> if (ptr && size > 0)
>> page_init_poison(ptr, size);
>>
>> @@ -1547,7 +1591,7 @@ void * __init memblock_alloc_try_nid(
>> __func__, (u64)size, (u64)align, nid, &min_addr,
>> &max_addr, (void *)_RET_IP_);
>> ptr = memblock_alloc_internal(size, align,
>> - min_addr, max_addr, nid);
>> + min_addr, max_addr, nid, 0);
>> if (ptr)
>> memset(ptr, 0, size);
>>
>> diff --git a/mm/sparse.c b/mm/sparse.c
>> index 72f010d..1a06471 100644
>> --- a/mm/sparse.c
>> +++ b/mm/sparse.c
>> @@ -475,7 +475,7 @@ static void __init sparse_buffer_init(unsigned long size, int nid)
>> phys_addr_t addr = __pa(MAX_DMA_ADDRESS);
>> WARN_ON(sparsemap_buf); /* forgot to call sparse_buffer_fini()? */
>> sparsemap_buf =
>> - memblock_alloc_try_nid_raw(size, PAGE_SIZE,
>> + memblock_alloc_exact_nid_raw(size, PAGE_SIZE,
>> addr,
>> MEMBLOCK_ALLOC_ACCESSIBLE, nid);
>> sparsemap_buf_end = sparsemap_buf + size;
>> --
>> 2.7.4.huawei.3
>>
>
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