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Date: Mon, 26 Jun 2017 11:31:18 -0700
From: Mike Kravetz <mike.kravetz@...cle.com>
To: Michal Hocko <mhocko@...nel.org>,
Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-mm@...ck.org, Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
Mel Gorman <mgorman@...e.de>, Vlastimil Babka <vbabka@...e.cz>,
LKML <linux-kernel@...r.kernel.org>,
Michal Hocko <mhocko@...e.com>
Subject: Re: [PATCH 2/3] hugetlb: add support for preferred node to
alloc_huge_page_nodemask
On 06/22/2017 12:30 PM, Michal Hocko wrote:
> From: Michal Hocko <mhocko@...e.com>
>
> alloc_huge_page_nodemask tries to allocate from any numa node in the
> allowed node mask starting from lower numa nodes. This might lead to
> filling up those low NUMA nodes while others are not used. We can reduce
> this risk by introducing a concept of the preferred node similar to what
> we have in the regular page allocator. We will start allocating from the
> preferred nid and then iterate over all allowed nodes in the zonelist
> order until we try them all.
>
> This is mimicking the page allocator logic except it operates on
> per-node mempools. dequeue_huge_page_vma already does this so distill
> the zonelist logic into a more generic dequeue_huge_page_nodemask
> and use it in alloc_huge_page_nodemask.
>
> This will allow us to use proper per numa distance fallback also for
> alloc_huge_page_node which can use alloc_huge_page_nodemask now and we
> can get rid of alloc_huge_page_node helper which doesn't have any user
> anymore.
>
> Changes since v1
> - get rid of dequeue_huge_page_node because it is not really needed
> - simplify dequeue_huge_page_nodemask and alloc_huge_page_nodemask a bit
> as per Vlastimil
Reviewed-by: Mike Kravetz <mike.kravetz@...cle.com>
Tested-by: Mike Kravetz <mike.kravetz@...cle.com>
--
Mike Kravetz
>
> Acked-by: Vlastimil Babka <vbabka@...e.cz>
> Signed-off-by: Michal Hocko <mhocko@...e.com>
> ---
> include/linux/hugetlb.h | 5 +--
> include/linux/migrate.h | 2 +-
> mm/hugetlb.c | 88 ++++++++++++++++++++++++-------------------------
> 3 files changed, 48 insertions(+), 47 deletions(-)
>
> diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
> index 66b621469f52..8d9fe131a240 100644
> --- a/include/linux/hugetlb.h
> +++ b/include/linux/hugetlb.h
> @@ -349,7 +349,8 @@ struct page *alloc_huge_page(struct vm_area_struct *vma,
> struct page *alloc_huge_page_node(struct hstate *h, int nid);
> struct page *alloc_huge_page_noerr(struct vm_area_struct *vma,
> unsigned long addr, int avoid_reserve);
> -struct page *alloc_huge_page_nodemask(struct hstate *h, nodemask_t *nmask);
> +struct page *alloc_huge_page_nodemask(struct hstate *h, int preferred_nid,
> + nodemask_t *nmask);
> int huge_add_to_page_cache(struct page *page, struct address_space *mapping,
> pgoff_t idx);
>
> @@ -525,7 +526,7 @@ static inline void set_huge_swap_pte_at(struct mm_struct *mm, unsigned long addr
> struct hstate {};
> #define alloc_huge_page(v, a, r) NULL
> #define alloc_huge_page_node(h, nid) NULL
> -#define alloc_huge_page_nodemask(h, nmask) NULL
> +#define alloc_huge_page_nodemask(h, preferred_nid, nmask) NULL
> #define alloc_huge_page_noerr(v, a, r) NULL
> #define alloc_bootmem_huge_page(h) NULL
> #define hstate_file(f) NULL
> diff --git a/include/linux/migrate.h b/include/linux/migrate.h
> index f80c9882403a..af3ccf93efaa 100644
> --- a/include/linux/migrate.h
> +++ b/include/linux/migrate.h
> @@ -38,7 +38,7 @@ static inline struct page *new_page_nodemask(struct page *page, int preferred_ni
>
> if (PageHuge(page))
> return alloc_huge_page_nodemask(page_hstate(compound_head(page)),
> - nodemask);
> + preferred_nid, nodemask);
>
> if (PageHighMem(page)
> || (zone_idx(page_zone(page)) == ZONE_MOVABLE))
> diff --git a/mm/hugetlb.c b/mm/hugetlb.c
> index fd6e0c50f949..1e516520433d 100644
> --- a/mm/hugetlb.c
> +++ b/mm/hugetlb.c
> @@ -887,19 +887,39 @@ static struct page *dequeue_huge_page_node_exact(struct hstate *h, int nid)
> return page;
> }
>
> -static struct page *dequeue_huge_page_node(struct hstate *h, int nid)
> +static struct page *dequeue_huge_page_nodemask(struct hstate *h, gfp_t gfp_mask, int nid,
> + nodemask_t *nmask)
> {
> - struct page *page;
> - int node;
> + unsigned int cpuset_mems_cookie;
> + struct zonelist *zonelist;
> + struct zone *zone;
> + struct zoneref *z;
> + int node = -1;
>
> - if (nid != NUMA_NO_NODE)
> - return dequeue_huge_page_node_exact(h, nid);
> + zonelist = node_zonelist(nid, gfp_mask);
> +
> +retry_cpuset:
> + cpuset_mems_cookie = read_mems_allowed_begin();
> + for_each_zone_zonelist_nodemask(zone, z, zonelist, gfp_zone(gfp_mask), nmask) {
> + struct page *page;
> +
> + if (!cpuset_zone_allowed(zone, gfp_mask))
> + continue;
> + /*
> + * no need to ask again on the same node. Pool is node rather than
> + * zone aware
> + */
> + if (zone_to_nid(zone) == node)
> + continue;
> + node = zone_to_nid(zone);
>
> - for_each_online_node(node) {
> page = dequeue_huge_page_node_exact(h, node);
> if (page)
> return page;
> }
> + if (unlikely(read_mems_allowed_retry(cpuset_mems_cookie)))
> + goto retry_cpuset;
> +
> return NULL;
> }
>
> @@ -917,15 +937,11 @@ static struct page *dequeue_huge_page_vma(struct hstate *h,
> unsigned long address, int avoid_reserve,
> long chg)
> {
> - struct page *page = NULL;
> + struct page *page;
> struct mempolicy *mpol;
> - nodemask_t *nodemask;
> gfp_t gfp_mask;
> + nodemask_t *nodemask;
> int nid;
> - struct zonelist *zonelist;
> - struct zone *zone;
> - struct zoneref *z;
> - unsigned int cpuset_mems_cookie;
>
> /*
> * A child process with MAP_PRIVATE mappings created by their parent
> @@ -940,32 +956,15 @@ static struct page *dequeue_huge_page_vma(struct hstate *h,
> if (avoid_reserve && h->free_huge_pages - h->resv_huge_pages == 0)
> goto err;
>
> -retry_cpuset:
> - cpuset_mems_cookie = read_mems_allowed_begin();
> gfp_mask = htlb_alloc_mask(h);
> nid = huge_node(vma, address, gfp_mask, &mpol, &nodemask);
> - zonelist = node_zonelist(nid, gfp_mask);
> -
> - for_each_zone_zonelist_nodemask(zone, z, zonelist,
> - MAX_NR_ZONES - 1, nodemask) {
> - if (cpuset_zone_allowed(zone, gfp_mask)) {
> - page = dequeue_huge_page_node(h, zone_to_nid(zone));
> - if (page) {
> - if (avoid_reserve)
> - break;
> - if (!vma_has_reserves(vma, chg))
> - break;
> -
> - SetPagePrivate(page);
> - h->resv_huge_pages--;
> - break;
> - }
> - }
> + page = dequeue_huge_page_nodemask(h, gfp_mask, nid, nodemask);
> + if (page && !avoid_reserve && vma_has_reserves(vma, chg)) {
> + SetPagePrivate(page);
> + h->resv_huge_pages--;
> }
>
> mpol_cond_put(mpol);
> - if (unlikely(!page && read_mems_allowed_retry(cpuset_mems_cookie)))
> - goto retry_cpuset;
> return page;
>
> err:
> @@ -1633,7 +1632,7 @@ struct page *alloc_huge_page_node(struct hstate *h, int nid)
>
> spin_lock(&hugetlb_lock);
> if (h->free_huge_pages - h->resv_huge_pages > 0)
> - page = dequeue_huge_page_node(h, nid);
> + page = dequeue_huge_page_nodemask(h, gfp_mask, nid, NULL);
> spin_unlock(&hugetlb_lock);
>
> if (!page)
> @@ -1642,26 +1641,27 @@ struct page *alloc_huge_page_node(struct hstate *h, int nid)
> return page;
> }
>
> -struct page *alloc_huge_page_nodemask(struct hstate *h, nodemask_t *nmask)
> +
> +struct page *alloc_huge_page_nodemask(struct hstate *h, int preferred_nid,
> + nodemask_t *nmask)
> {
> gfp_t gfp_mask = htlb_alloc_mask(h);
> - struct page *page = NULL;
> - int node;
>
> spin_lock(&hugetlb_lock);
> if (h->free_huge_pages - h->resv_huge_pages > 0) {
> - for_each_node_mask(node, *nmask) {
> - page = dequeue_huge_page_node_exact(h, node);
> - if (page)
> - break;
> + struct page *page;
> +
> + page = dequeue_huge_page_nodemask(h, gfp_mask, preferred_nid, nmask);
> + if (page) {
> + spin_unlock(&hugetlb_lock);
> + return page;
> }
> }
> spin_unlock(&hugetlb_lock);
> - if (page)
> - return page;
>
> /* No reservations, try to overcommit */
> - return __alloc_buddy_huge_page(h, gfp_mask, NUMA_NO_NODE, nmask);
> +
> + return __alloc_buddy_huge_page(h, gfp_mask, preferred_nid, nmask);
> }
>
> /*
>
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