linux-kernel - Re: [PATCH v7] hugetlbfs: Extend the definition of hugepages parameter to support node allocation

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Date:   Wed, 29 Sep 2021 13:38:15 +0800
From:   Zhenguo Yao <yaozhenguo1@...il.com>
To:     Mike Rapoport <rppt@...nel.org>
Cc:     Mike Kravetz <mike.kravetz@...cle.com>, mpe@...erman.id.au,
        benh@...nel.crashing.org, paulus@...ba.org, corbet@....net,
        Andrew Morton <akpm@...ux-foundation.org>, yaozhenguo@...com,
        Matthew Wilcox <willy@...radead.org>,
        linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
        Linux Memory Management List <linux-mm@...ck.org>
Subject: Re: [PATCH v7] hugetlbfs: Extend the definition of hugepages
 parameter to support node allocation

Thanks for your advice.

Mike Rapoport <rppt@...nel.org> 于2021年9月29日周三 上午12:47写道：
>
> Hi,
>
> On Mon, Sep 27, 2021 at 06:41:49PM +0800, Zhenguo Yao wrote:
> > We can specify the number of hugepages to allocate at boot. But the
> > hugepages is balanced in all nodes at present. In some scenarios,
> > we only need hugepages in one node. For example: DPDK needs hugepages
> > which are in the same node as NIC. if DPDK needs four hugepages of 1G
> > size in node1 and system has 16 numa nodes. We must reserve 64 hugepages
> > in kernel cmdline. But, only four hugepages are used. The others should
> > be free after boot. If the system memory is low(for example: 64G), it will
> > be an impossible task. So, Extending hugepages parameter to support
> > specifying hugepages at a specific node.
> > For example add following parameter:
> >
> > hugepagesz=1G hugepages=0:1,1:3
> >
> > It will allocate 1 hugepage in node0 and 3 hugepages in node1.
> >
> > Signed-off-by: Zhenguo Yao <yaozhenguo1@...il.com>
> > ---
>
> ...
>
> > diff --git a/arch/powerpc/mm/hugetlbpage.c b/arch/powerpc/mm/hugetlbpage.c
> > index 9a75ba078e1b..dd40ce6e7565 100644
> > --- a/arch/powerpc/mm/hugetlbpage.c
> > +++ b/arch/powerpc/mm/hugetlbpage.c
> > @@ -229,17 +229,22 @@ static int __init pseries_alloc_bootmem_huge_page(struct hstate *hstate)
> >       m->hstate = hstate;
> >       return 1;
> >  }
> > +
> > +bool __init node_specific_alloc_support(void)
>
> I'd suggest to namespace this to hugetlb, e.g.
>
> hugetlb_node_alloc_supported()
>
Looks good to me.
> > +{
> > +     return false;
> > +}
> >  #endif
> >
> >
> > -int __init alloc_bootmem_huge_page(struct hstate *h)
> > +int __init alloc_bootmem_huge_page(struct hstate *h, int nid)
> >  {
> >
> >  #ifdef CONFIG_PPC_BOOK3S_64
> >       if (firmware_has_feature(FW_FEATURE_LPAR) && !radix_enabled())
> >               return pseries_alloc_bootmem_huge_page(h);
> >  #endif
> > -     return __alloc_bootmem_huge_page(h);
> > +     return __alloc_bootmem_huge_page(h, nid);
> >  }
> >
> >  #ifndef CONFIG_PPC_BOOK3S_64
>
> ...
>
> > @@ -2868,33 +2869,41 @@ struct page *alloc_huge_page(struct vm_area_struct *vma,
> >       return ERR_PTR(-ENOSPC);
> >  }
> >
> > -int alloc_bootmem_huge_page(struct hstate *h)
> > +int alloc_bootmem_huge_page(struct hstate *h, int nid)
> >       __attribute__ ((weak, alias("__alloc_bootmem_huge_page")));
> > -int __alloc_bootmem_huge_page(struct hstate *h)
> > +int __alloc_bootmem_huge_page(struct hstate *h, int nid)
> >  {
> >       struct huge_bootmem_page *m;
> >       int nr_nodes, node;
> >
> > +     if (nid >= nr_online_nodes)
> > +             return 0;
> > +     /* do node specific alloc */
> > +     if (nid != NUMA_NO_NODE) {
> > +             m = memblock_alloc_try_nid_raw(huge_page_size(h), huge_page_size(h),
> > +                             0, MEMBLOCK_ALLOC_ACCESSIBLE, nid);
> > +             if (m)
> > +                     goto found;
> > +             else
> > +                     return 0;
>
> Nit: you could make it a bit simpler with
>
>                 if (!m)
>                         return 0;
>                 goto found;
>
Looks more regular.
> > +     }
> > +     /* do all node balanced alloc */
> >       for_each_node_mask_to_alloc(h, nr_nodes, node, &node_states[N_MEMORY]) {
> > -             void *addr;
> > -
> > -             addr = memblock_alloc_try_nid_raw(
> > +             m = memblock_alloc_try_nid_raw(
> >                               huge_page_size(h), huge_page_size(h),
> >                               0, MEMBLOCK_ALLOC_ACCESSIBLE, node);
> > -             if (addr) {
> > -                     /*
> > -                      * Use the beginning of the huge page to store the
> > -                      * huge_bootmem_page struct (until gather_bootmem
> > -                      * puts them into the mem_map).
> > -                      */
> > -                     m = addr;
> > +             /*
> > +              * Use the beginning of the huge page to store the
> > +              * huge_bootmem_page struct (until gather_bootmem
> > +              * puts them into the mem_map).
> > +              */
> > +             if (m)
> >                       goto found;
> > -             }
> > +             else
> > +                     return 0;
>
> ditto
>
> >       }
> > -     return 0;
> >
> >  found:
> > -     BUG_ON(!IS_ALIGNED(virt_to_phys(m), huge_page_size(h)));
> >       /* Put them into a private list first because mem_map is not up yet */
> >       INIT_LIST_HEAD(&m->list);
> >       list_add(&m->list, &huge_boot_pages);
>
> --
> Sincerely yours,
> Mike.