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Date: Tue, 05 Apr 2011 10:42:10 -0700
From: Yinghai Lu <yinghai@...nel.org>
To: Tejun Heo <tj@...nel.org>
CC: mingo@...hat.com, hpa@...or.com, tglx@...utronix.de,
rientjes@...gle.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 04/14] x86-32, NUMA: Reorganize calculate_numa_remap_page()
On 04/04/2011 03:23 PM, Tejun Heo wrote:
> Separate the outer node walking loop and per-node logic from
> calculate_numa_remap_pages(). The outer loop is collapsed into
> initmem_init() and the per-node logic is moved into a new function -
> init_alloc_remap().
>
> The new function name is confusing with the existing
> init_remap_allocator() and the behavior is the function isn't very
> clean either at this point, but this is to prepare for further
> cleanups and it will become prettier.
>
> This function doesn't introduce any behavior change.
>
> Signed-off-by: Tejun Heo<tj@...nel.org>
> Cc: Yinghai Lu<yinghai@...nel.org>
> Cc: David Rientjes<rientjes@...gle.com>
> Cc: Thomas Gleixner<tglx@...utronix.de
> Cc: Ingo Molnar<mingo@...hat.com>
> Cc: "H. Peter Anvin"<hpa@...or.com>
> ---
> arch/x86/mm/numa_32.c | 127 ++++++++++++++++++++++++-------------------------
> 1 files changed, 63 insertions(+), 64 deletions(-)
>
> diff --git a/arch/x86/mm/numa_32.c b/arch/x86/mm/numa_32.c
> index 60701a5..5039e9b 100644
> --- a/arch/x86/mm/numa_32.c
> +++ b/arch/x86/mm/numa_32.c
> @@ -264,70 +264,64 @@ void resume_map_numa_kva(pgd_t *pgd_base)
> }
> #endif
>
> -static __init unsigned long calculate_numa_remap_pages(void)
> +static __init unsigned long init_alloc_remap(int nid, unsigned long offset)
> {
> - int nid;
> - unsigned long size, reserve_pages = 0;
> + unsigned long size;
> + u64 node_kva;
>
> - for_each_online_node(nid) {
> - u64 node_kva;
> -
> - /*
> - * The acpi/srat node info can show hot-add memroy zones
> - * where memory could be added but not currently present.
> - */
> - printk(KERN_DEBUG "node %d pfn: [%lx - %lx]\n",
> - nid, node_start_pfn[nid], node_end_pfn[nid]);
> - if (node_start_pfn[nid]> max_pfn)
> - continue;
> - if (!node_end_pfn[nid])
> - continue;
> - if (node_end_pfn[nid]> max_pfn)
> - node_end_pfn[nid] = max_pfn;
> -
> - /* ensure the remap includes space for the pgdat. */
> - size = node_remap_size[nid];
> - size += ALIGN(sizeof(pg_data_t), PAGE_SIZE);
> -
> - /* convert size to large (pmd size) pages, rounding up */
> - size = (size + LARGE_PAGE_BYTES - 1) / LARGE_PAGE_BYTES;
> - /* now the roundup is correct, convert to PAGE_SIZE pages */
> - size = size * PTRS_PER_PTE;
> -
> - node_kva = memblock_find_in_range(node_start_pfn[nid]<< PAGE_SHIFT,
> - ((u64)node_end_pfn[nid])<<PAGE_SHIFT,
> - ((u64)size)<<PAGE_SHIFT,
> - LARGE_PAGE_BYTES);
> - if (node_kva == MEMBLOCK_ERROR)
> - panic("Can not get kva ram\n");
> -
> - node_remap_size[nid] = size;
> - node_remap_offset[nid] = reserve_pages;
> - reserve_pages += size;
> - printk(KERN_DEBUG "Reserving %ld pages of KVA for lmem_map of"
> - " node %d at %llx\n",
> - size, nid, node_kva>> PAGE_SHIFT);
> -
> - /*
> - * prevent kva address below max_low_pfn want it on system
> - * with less memory later.
> - * layout will be: KVA address , KVA RAM
> - *
> - * we are supposed to only record the one less then max_low_pfn
> - * but we could have some hole in high memory, and it will only
> - * check page_is_ram(pfn)&& !page_is_reserved_early(pfn) to decide
> - * to use it as free.
> - * So memblock_x86_reserve_range here, hope we don't run out of that array
> - */
> - memblock_x86_reserve_range(node_kva,
> - node_kva + (((u64)size)<<PAGE_SHIFT),
> - "KVA RAM");
> -
> - node_remap_start_pfn[nid] = node_kva>> PAGE_SHIFT;
> - }
> - printk(KERN_INFO "Reserving total of %lx pages for numa KVA remap\n",
> - reserve_pages);
> - return reserve_pages;
> + /*
> + * The acpi/srat node info can show hot-add memroy zones where
> + * memory could be added but not currently present.
> + */
> + printk(KERN_DEBUG "node %d pfn: [%lx - %lx]\n",
> + nid, node_start_pfn[nid], node_end_pfn[nid]);
> + if (node_start_pfn[nid]> max_pfn)
> + return 0;
> + if (!node_end_pfn[nid])
> + return 0;
> + if (node_end_pfn[nid]> max_pfn)
> + node_end_pfn[nid] = max_pfn;
> +
> + /* ensure the remap includes space for the pgdat. */
> + size = node_remap_size[nid];
> + size += ALIGN(sizeof(pg_data_t), PAGE_SIZE);
> +
> + /* convert size to large (pmd size) pages, rounding up */
> + size = (size + LARGE_PAGE_BYTES - 1) / LARGE_PAGE_BYTES;
> + /* now the roundup is correct, convert to PAGE_SIZE pages */
> + size = size * PTRS_PER_PTE;
> +
> + node_kva = memblock_find_in_range(node_start_pfn[nid]<< PAGE_SHIFT,
> + (u64)node_end_pfn[nid]<< PAGE_SHIFT,
> + (u64)size<< PAGE_SHIFT,
> + LARGE_PAGE_BYTES);
> + if (node_kva == MEMBLOCK_ERROR)
> + panic("Can not get kva ram\n");
> +
> + node_remap_size[nid] = size;
> + node_remap_offset[nid] = offset;
> + printk(KERN_DEBUG "Reserving %ld pages of KVA for lmem_map of node %d at %llx\n",
> + size, nid, node_kva>> PAGE_SHIFT);
> +
> + /*
> + * prevent kva address below max_low_pfn want it on system
> + * with less memory later.
> + * layout will be: KVA address , KVA RAM
> + *
> + * we are supposed to only record the one less then
> + * max_low_pfn but we could have some hole in high memory,
> + * and it will only check page_is_ram(pfn)&&
> + * !page_is_reserved_early(pfn) to decide to use it as free.
> + * So memblock_x86_reserve_range here, hope we don't run out
> + * of that array
> + */
> + memblock_x86_reserve_range(node_kva,
> + node_kva + ((u64)size<< PAGE_SHIFT),
> + "KVA RAM");
> +
> + node_remap_start_pfn[nid] = node_kva>> PAGE_SHIFT;
> +
> + return size;
> }
>
> static void init_remap_allocator(int nid)
> @@ -346,6 +340,7 @@ static void init_remap_allocator(int nid)
>
> void __init initmem_init(void)
> {
> + unsigned long reserve_pages = 0;
> int nid;
>
> /*
> @@ -359,7 +354,11 @@ void __init initmem_init(void)
> get_memcfg_numa();
> numa_init_array();
>
> - kva_pages = roundup(calculate_numa_remap_pages(), PTRS_PER_PTE);
> + for_each_online_node(nid)
> + reserve_pages += init_alloc_remap(nid, reserve_pages);
> + kva_pages = roundup(reserve_pages, PTRS_PER_PTE);
> + printk(KERN_INFO "Reserving total of %lx pages for numa KVA remap\n",
> + reserve_pages);
>
> kva_start_pfn = memblock_find_in_range(min_low_pfn<< PAGE_SHIFT,
> max_low_pfn<< PAGE_SHIFT,
Acked-by: Yinghai Lu <yinghai@...nel.org>
--
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