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Date: Wed, 22 Sep 2021 17:14:02 +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 v5] hugetlbfs: Extend the definition of hugepages
parameter to support node allocation
Thanks for your review.
Mike Rapoport <rppt@...nel.org> 于2021年9月19日周日 上午3:28写道：
>
> On Sat, Sep 18, 2021 at 07:32:01PM +0800, yaozhenguo 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: yaozhenguo <yaozhenguo1@...il.com>
> > ---
> > v4->v5 changes:
> > - remove BUG_ON in __alloc_bootmem_huge_page.
> > - add nid parameter in __alloc_bootmem_huge_page to support
> > called in both specific node alloc and normal alloc.
> > - do normal alloc if architecture can't support node specific alloc.
> > - return -1 in powerpc version of alloc_bootmem_huge_page when
> > nid is not NUMA_NO_NODE.
>
> I think, node format should not be enabled on powerpc. Rather than add a
> new return value to alloc_bootmem_huge_page() and add complex checks for
> -1, 0 and 1, it would be simpler to add a new weak function. The default
> implementation will return true and powerpc will have an override that
> returns false.
> This function can be called during command line parsing and if it returned
> false the entire per-node allocation path would be disabled.
>
Seems more clearly and simpler. I will change it.
> >
> > ---
> > .../admin-guide/kernel-parameters.txt | 8 +-
> > Documentation/admin-guide/mm/hugetlbpage.rst | 12 +-
> > arch/powerpc/mm/hugetlbpage.c | 8 +-
> > include/linux/hugetlb.h | 5 +-
> > mm/hugetlb.c | 155 ++++++++++++++++--
> > 5 files changed, 166 insertions(+), 22 deletions(-)
> >
> > diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
> > index bdb22006f..a2046b2c5 100644
> > --- a/Documentation/admin-guide/kernel-parameters.txt
> > +++ b/Documentation/admin-guide/kernel-parameters.txt
> > @@ -1588,9 +1588,11 @@
> > the number of pages of hugepagesz to be allocated.
> > If this is the first HugeTLB parameter on the command
> > line, it specifies the number of pages to allocate for
> > - the default huge page size. See also
> > - Documentation/admin-guide/mm/hugetlbpage.rst.
> > - Format: <integer>
> > + the default huge page size. If using node format, the
> > + number of pages to allocate per-node can be specified.
> > + See also Documentation/admin-guide/mm/hugetlbpage.rst.
> > + Format: <integer> or (node format)
> > + <node>:<integer>[,<node>:<integer>]
> >
> > hugepagesz=
> > [HW] The size of the HugeTLB pages. This is used in
> > diff --git a/Documentation/admin-guide/mm/hugetlbpage.rst b/Documentation/admin-guide/mm/hugetlbpage.rst
> > index 8abaeb144..d70828c07 100644
> > --- a/Documentation/admin-guide/mm/hugetlbpage.rst
> > +++ b/Documentation/admin-guide/mm/hugetlbpage.rst
> > @@ -128,7 +128,9 @@ hugepages
> > implicitly specifies the number of huge pages of default size to
> > allocate. If the number of huge pages of default size is implicitly
> > specified, it can not be overwritten by a hugepagesz,hugepages
> > - parameter pair for the default size.
> > + parameter pair for the default size. This parameter also has a
> > + node format. The node format specifies the number of huge pages
> > + to allocate on specific nodes.
> >
> > For example, on an architecture with 2M default huge page size::
> >
> > @@ -138,6 +140,14 @@ hugepages
> > indicating that the hugepages=512 parameter is ignored. If a hugepages
> > parameter is preceded by an invalid hugepagesz parameter, it will
> > be ignored.
> > +
> > + Node format example::
> > +
> > + hugepagesz=2M hugepages=0:1,1:2
> > +
> > + It will allocate 1 2M hugepage on node0 and 2 2M hugepages on node1.
> > + If the node number is invalid, the parameter will be ignored.
> > +
> > default_hugepagesz
> > Specify the default huge page size. This parameter can
> > only be specified once on the command line. default_hugepagesz can
> > diff --git a/arch/powerpc/mm/hugetlbpage.c b/arch/powerpc/mm/hugetlbpage.c
> > index 9a75ba078..4a9cea714 100644
> > --- a/arch/powerpc/mm/hugetlbpage.c
> > +++ b/arch/powerpc/mm/hugetlbpage.c
> > @@ -19,6 +19,7 @@
> > #include <linux/swap.h>
> > #include <linux/swapops.h>
> > #include <linux/kmemleak.h>
> > +#include <linux/numa.h>
> > #include <asm/pgalloc.h>
> > #include <asm/tlb.h>
> > #include <asm/setup.h>
> > @@ -232,14 +233,17 @@ static int __init pseries_alloc_bootmem_huge_page(struct hstate *hstate)
> > #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
> > + /* Don't support node specific alloc */
> > + if (nid != NUMA_NO_NODE)
> > + return -1;
> > 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
> > diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
> > index f7ca1a387..a9bdbc870 100644
> > --- a/include/linux/hugetlb.h
> > +++ b/include/linux/hugetlb.h
> > @@ -605,6 +605,7 @@ struct hstate {
> > unsigned long nr_overcommit_huge_pages;
> > struct list_head hugepage_activelist;
> > struct list_head hugepage_freelists[MAX_NUMNODES];
> > + unsigned int max_huge_pages_node[MAX_NUMNODES];
> > unsigned int nr_huge_pages_node[MAX_NUMNODES];
> > unsigned int free_huge_pages_node[MAX_NUMNODES];
> > unsigned int surplus_huge_pages_node[MAX_NUMNODES];
> > @@ -637,8 +638,8 @@ void restore_reserve_on_error(struct hstate *h, struct vm_area_struct *vma,
> > unsigned long address, struct page *page);
> >
> > /* arch callback */
> > -int __init __alloc_bootmem_huge_page(struct hstate *h);
> > -int __init alloc_bootmem_huge_page(struct hstate *h);
> > +int __init __alloc_bootmem_huge_page(struct hstate *h, int nid);
> > +int __init alloc_bootmem_huge_page(struct hstate *h, int nid);
> >
> > void __init hugetlb_add_hstate(unsigned order);
> > bool __init arch_hugetlb_valid_size(unsigned long size);
> > diff --git a/mm/hugetlb.c b/mm/hugetlb.c
> > index dfc940d52..f7aaca6ff 100644
> > --- a/mm/hugetlb.c
> > +++ b/mm/hugetlb.c
> > @@ -66,6 +66,7 @@ static struct hstate * __initdata parsed_hstate;
> > static unsigned long __initdata default_hstate_max_huge_pages;
> > static bool __initdata parsed_valid_hugepagesz = true;
> > static bool __initdata parsed_default_hugepagesz;
> > +static unsigned int default_hugepages_in_node[MAX_NUMNODES] __initdata;
> >
> > /*
> > * Protects updates to hugepage_freelists, hugepage_activelist, nr_huge_pages,
> > @@ -2774,17 +2775,30 @@ struct page *alloc_huge_page(struct vm_area_struct *vma,
> > vma_end_reservation(h, vma, addr);
> > return ERR_PTR(-ENOSPC);
> > }
> > -
> > -int alloc_bootmem_huge_page(struct hstate *h)
> > +/*
> > + * Architecture version must provide there own node specific hugepage
>
> ^ its
>
> > + * allocation code. If not, please return -1 when nid is not NUMA_NO_NODE.
> > + */
> > +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;
> > + void *addr = NULL;
> >
> > + /* do node specific alloc */
> > + if (nid != NUMA_NO_NODE && nid < nodes_weight(node_states[N_MEMORY])) {
> > + addr = memblock_alloc_try_nid_raw(huge_page_size(h), huge_page_size(h),
> > + 0, MEMBLOCK_ALLOC_ACCESSIBLE, nid);
> > + if (addr) {
> > + m = addr;
> > + goto found;
> > + } else {
> > + return 0;
> > + }
>
> if (!addr)
> return 0;
> m = addr;
> goto found;
>
> seems simpler to me.
>
> Besides, I think addr is not needed at all, m can be assigned directly. I'd
> also rename it to e.g. page.
>
Yes, addr seems useless. I will remove it.
> > + }
> > for_each_node_mask_to_alloc(h, nr_nodes, node, &node_states[N_MEMORY]) {
> > - void *addr;
> > -
> > addr = memblock_alloc_try_nid_raw(
> > huge_page_size(h), huge_page_size(h),
> > 0, MEMBLOCK_ALLOC_ACCESSIBLE, node);
> > @@ -2801,7 +2815,6 @@ int __alloc_bootmem_huge_page(struct hstate *h)
> > 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);
> > @@ -2841,11 +2854,83 @@ static void __init gather_bootmem_prealloc(void)
> > cond_resched();
> > }
> > }
> > +/*
> > + * do node specific hugepage allocation
> > + * return 0: allocation is failed
> > + * 1: allocation is successful
> > + * -1: alloc_bootmem_huge_page can't support node specific allocation
> > + */
> > +static int __init hugetlb_hstate_alloc_pages_onenode(struct hstate *h, int nid)
> > +{
> > + unsigned long i;
> > + char buf[32];
> > + int ret = 1;
> > +
> > + for (i = 0; i < h->max_huge_pages_node[nid]; ++i) {
> > + if (hstate_is_gigantic(h)) {
> > + ret = alloc_bootmem_huge_page(h, nid);
> > + if (ret == 0 || ret == -1)
> > + break;
> > + } else {
> > + struct page *page;
> > + gfp_t gfp_mask = htlb_alloc_mask(h) | __GFP_THISNODE;
> > +
> > + page = alloc_fresh_huge_page(h, gfp_mask, nid,
> > + &node_states[N_MEMORY], NULL);
> > + if (!page) {
> > + ret = 0;
> > + break;
> > + }
> > + put_page(page); /* free it into the hugepage allocator */
> > + }
> > + cond_resched();
> > + }
> > + if (i == h->max_huge_pages_node[nid])
> > + return ret;
> > +
> > + string_get_size(huge_page_size(h), 1, STRING_UNITS_2, buf, 32);
> > + pr_warn("HugeTLB: allocating %u of page size %s failed node%d. Only allocated %lu hugepages.\n",
> > + h->max_huge_pages_node[nid], buf, nid, i);
> > + /*
> > + * we need h->max_huge_pages to do normal alloc,
> > + * when alloc_bootm_huge_page can't support node specific allocation.
> > + */
> > + if (ret != -1)
> > + h->max_huge_pages -= (h->max_huge_pages_node[nid] - i);
> > + h->max_huge_pages_node[nid] = i;
> > + return ret;
> > +}
> >
> > static void __init hugetlb_hstate_alloc_pages(struct hstate *h)
> > {
> > unsigned long i;
> > nodemask_t *node_alloc_noretry;
> > + bool hugetlb_node_set = false;
> > +
> > + /* skip gigantic hugepages allocation if hugetlb_cma enabled */
> > + if (hstate_is_gigantic(h) && hugetlb_cma_size) {
> > + pr_warn_once("HugeTLB: hugetlb_cma is enabled, skip boot time allocation\n");
> > + return;
> > + }
> > +
> > + /* do node alloc */
> > + for (i = 0; i < nodes_weight(node_states[N_MEMORY]); i++) {
> > + if (h->max_huge_pages_node[i] > 0) {
> > + /*
> > + * if hugetlb_hstate_alloc_pages_onenode return -1
> > + * architecture version alloc_bootmem_huge_page
> > + * can't support node specific alloc for gigantic
> > + * hugepage, so goto normal alloc.
> > + */
> > + if (hugetlb_hstate_alloc_pages_onenode(h, i) == -1)
> > + pr_warn_once("HugeTLB: architecture can't support node specific alloc, skip!\n");
> > + else
> > + hugetlb_node_set = true;
> > + }
> > + }
> > +
> > + if (hugetlb_node_set)
> > + return;
>
> If I understand correctly, this means that even if the allocation fails for
> some of the nodes explicitly set in hugepages=nid:pages,..., we won't try
> allocate more huge pages and silently ignore the failure. Is this the
> intended behaviour?
>
Yes, If the allocation is failed in some specific nodes. We just print
warning messages
in hugetlb_hstate_alloc_pages_onenode to remind the user to use
appropriate hugepages
parameters or check the system and do not try to allocate more huge pages.
hugetlb_node_set is used here to judge whether it is node specific
alloc in this “hstate”.
If it is a node specific allocation for this “hstate”, we should not
do old path(bellow code)
allocation whether the node specific allocation is successful or not.
> >
> > if (!hstate_is_gigantic(h)) {
> > /*
> > @@ -2867,11 +2952,7 @@ static void __init hugetlb_hstate_alloc_pages(struct hstate *h)
> >
> > for (i = 0; i < h->max_huge_pages; ++i) {
> > if (hstate_is_gigantic(h)) {
> > - if (hugetlb_cma_size) {
> > - pr_warn_once("HugeTLB: hugetlb_cma is enabled, skip boot time allocation\n");
> > - goto free;
> > - }
> > - if (!alloc_bootmem_huge_page(h))
> > + if (!alloc_bootmem_huge_page(h, NUMA_NO_NODE))
> > break;
> > } else if (!alloc_pool_huge_page(h,
> > &node_states[N_MEMORY],
> > @@ -2887,7 +2968,6 @@ static void __init hugetlb_hstate_alloc_pages(struct hstate *h)
> > h->max_huge_pages, buf, i);
> > h->max_huge_pages = i;
> > }
> > -free:
> > kfree(node_alloc_noretry);
> > }
> >
>
> --
> Sincerely yours,
> Mike.
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