Thanks for your advice.
Mike Rapoport <rppt@xxxxxxxxxx> 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@xxxxxxxxx>
> > ---
>
> ...
>
> > 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.
