From: Nicholas Piggin <npiggin@gmail.com>
To: Andrew Morton <akpm@linux-foundation.org>,
Christophe Leroy <christophe.leroy@csgroup.eu>,
linux-mm@kvack.org
Cc: Ding Tianhong <dingtianhong@huawei.com>,
Christoph Hellwig <hch@infradead.org>,
Jonathan Cameron <Jonathan.Cameron@Huawei.com>,
linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org,
linuxppc-dev@lists.ozlabs.org, Zefan Li <lizefan@huawei.com>,
Rick Edgecombe <rick.p.edgecombe@intel.com>
Subject: Re: [PATCH v10 11/12] mm/vmalloc: Hugepage vmalloc mappings
Date: Mon, 25 Jan 2021 21:37:52 +1000 [thread overview]
Message-ID: <1611574637.k9njsi2um5.astroid@bobo.none> (raw)
In-Reply-To: <933352bd-dcf3-c483-4d7a-07afe1116cf1@csgroup.eu>
Excerpts from Christophe Leroy's message of January 25, 2021 7:14 pm:
>
>
> Le 24/01/2021 à 09:22, Nicholas Piggin a écrit :
>> Support huge page vmalloc mappings. Config option HAVE_ARCH_HUGE_VMALLOC
>> enables support on architectures that define HAVE_ARCH_HUGE_VMAP and
>> supports PMD sized vmap mappings.
>>
>> vmalloc will attempt to allocate PMD-sized pages if allocating PMD size
>> or larger, and fall back to small pages if that was unsuccessful.
>>
>> Architectures must ensure that any arch specific vmalloc allocations
>> that require PAGE_SIZE mappings (e.g., module allocations vs strict
>> module rwx) use the VM_NOHUGE flag to inhibit larger mappings.
>>
>> When hugepage vmalloc mappings are enabled in the next patch, this
>> reduces TLB misses by nearly 30x on a `git diff` workload on a 2-node
>> POWER9 (59,800 -> 2,100) and reduces CPU cycles by 0.54%.
>>
>> This can result in more internal fragmentation and memory overhead for a
>> given allocation, an option nohugevmalloc is added to disable at boot.
>>
>> Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
>> ---
>> arch/Kconfig | 10 +++
>> include/linux/vmalloc.h | 18 ++++
>> mm/page_alloc.c | 5 +-
>> mm/vmalloc.c | 192 ++++++++++++++++++++++++++++++----------
>> 4 files changed, 177 insertions(+), 48 deletions(-)
>>
>
>> diff --git a/mm/vmalloc.c b/mm/vmalloc.c
>> index 0377e1d059e5..eef61e0f5170 100644
>> --- a/mm/vmalloc.c
>> +++ b/mm/vmalloc.c
>
>> @@ -2691,15 +2746,18 @@ EXPORT_SYMBOL_GPL(vmap_pfn);
>> #endif /* CONFIG_VMAP_PFN */
>>
>> static void *__vmalloc_area_node(struct vm_struct *area, gfp_t gfp_mask,
>> - pgprot_t prot, int node)
>> + pgprot_t prot, unsigned int page_shift,
>> + int node)
>> {
>> const gfp_t nested_gfp = (gfp_mask & GFP_RECLAIM_MASK) | __GFP_ZERO;
>> - unsigned int nr_pages = get_vm_area_size(area) >> PAGE_SHIFT;
>> - unsigned long array_size;
>> - unsigned int i;
>> + unsigned int page_order = page_shift - PAGE_SHIFT;
>> + unsigned long addr = (unsigned long)area->addr;
>> + unsigned long size = get_vm_area_size(area);
>> + unsigned int nr_small_pages = size >> PAGE_SHIFT;
>> struct page **pages;
>> + unsigned int i;
>>
>> - array_size = (unsigned long)nr_pages * sizeof(struct page *);
>> + array_size = (unsigned long)nr_small_pages * sizeof(struct page *);
>
> array_size() is a function in include/linux/overflow.h
>
> For some reason, it breaks the build with your series.
What config? I haven't seen it.
Thanks,
Nick
next prev parent reply other threads:[~2021-01-25 11:38 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-24 8:22 [PATCH v10 00/12] huge vmalloc mappings Nicholas Piggin
2021-01-24 8:22 ` [PATCH v10 01/12] mm/vmalloc: fix vmalloc_to_page for huge vmap mappings Nicholas Piggin
2021-01-24 11:31 ` Christoph Hellwig
2021-01-24 8:22 ` [PATCH v10 02/12] mm: apply_to_pte_range warn and fail if a large pte is encountered Nicholas Piggin
2021-01-24 11:32 ` Christoph Hellwig
2021-01-24 8:22 ` [PATCH v10 03/12] mm/vmalloc: rename vmap_*_range vmap_pages_*_range Nicholas Piggin
2021-01-24 11:34 ` Christoph Hellwig
2021-01-24 8:22 ` [PATCH v10 04/12] mm/ioremap: rename ioremap_*_range to vmap_*_range Nicholas Piggin
2021-01-24 11:36 ` Christoph Hellwig
2021-01-24 12:04 ` Nicholas Piggin
2021-01-24 8:22 ` [PATCH v10 05/12] mm: HUGE_VMAP arch support cleanup Nicholas Piggin
2021-01-24 11:40 ` Christoph Hellwig
2021-01-24 12:22 ` Nicholas Piggin
2021-01-25 8:19 ` Christophe Leroy
2021-01-25 8:40 ` Christophe Leroy
2021-01-24 8:22 ` [PATCH v10 06/12] powerpc: inline huge vmap supported functions Nicholas Piggin
2021-01-25 8:42 ` Christophe Leroy
2021-01-25 11:37 ` Nicholas Piggin
2021-01-24 8:22 ` [PATCH v10 07/12] arm64: " Nicholas Piggin
2021-01-24 8:22 ` [PATCH v10 08/12] x86: " Nicholas Piggin
2021-01-24 8:22 ` [PATCH v10 09/12] mm: Move vmap_range from mm/ioremap.c to mm/vmalloc.c Nicholas Piggin
2021-01-24 14:49 ` Christoph Hellwig
2021-01-24 8:22 ` [PATCH v10 10/12] mm/vmalloc: add vmap_range_noflush variant Nicholas Piggin
2021-01-24 14:51 ` Christoph Hellwig
2021-01-24 8:22 ` [PATCH v10 11/12] mm/vmalloc: Hugepage vmalloc mappings Nicholas Piggin
2021-01-24 15:07 ` Christoph Hellwig
2021-01-24 18:06 ` Randy Dunlap
2021-01-24 23:17 ` Nicholas Piggin
2021-01-25 9:14 ` Christophe Leroy
2021-01-25 11:37 ` Nicholas Piggin [this message]
2021-01-25 12:13 ` Christophe Leroy
2021-01-25 12:24 ` David Laight
2021-01-26 9:50 ` Nicholas Piggin
2021-01-24 8:22 ` [PATCH v10 12/12] powerpc/64s/radix: Enable huge " Nicholas Piggin
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