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Message-ID: <115a973d-6ede-7fcf-d1c6-8a62194cff59@suse.cz>
Date: Wed, 14 Jun 2017 17:06:47 +0200
From: Vlastimil Babka <vbabka@...e.cz>
To: Michal Hocko <mhocko@...nel.org>
Cc: linux-mm@...ck.org, Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
Mike Kravetz <mike.kravetz@...cle.com>,
Mel Gorman <mgorman@...e.de>,
Andrew Morton <akpm@...ux-foundation.org>,
LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH 1/4] mm, hugetlb: unclutter hugetlb allocation layers
On 06/14/2017 03:42 PM, Michal Hocko wrote:
> On Wed 14-06-17 15:18:26, Vlastimil Babka wrote:
>> On 06/13/2017 11:00 AM, Michal Hocko wrote:
> [...]
>>> @@ -1717,13 +1640,22 @@ struct page *alloc_huge_page_node(struct hstate *h, int nid)
>>> page = dequeue_huge_page_node(h, nid);
>>> spin_unlock(&hugetlb_lock);
>>>
>>> - if (!page)
>>> - page = __alloc_buddy_huge_page_no_mpol(h, nid);
>>> + if (!page) {
>>> + nodemask_t nmask;
>>> +
>>> + if (nid != NUMA_NO_NODE) {
>>> + nmask = NODE_MASK_NONE;
>>> + node_set(nid, nmask);
>>
>> TBH I don't like this hack too much, and would rather see __GFP_THISNODE
>> involved, which picks a different (short) zonelist. Also it's allocating
>> nodemask on stack, which we generally avoid? Although the callers
>> currently seem to be shallow.
>
> Fair enough. That would require pulling gfp mask handling up the call
> chain. This on top of this patch + refreshes for other patches later in
> the series as they will conflict now?
For the orig patch + fold (squashed locally from your mmotm/... branch)
Acked-by: Vlastimil Babka <vbabka@...e.cz>
Please update the commit description which still mentions the nodemask
emulation of __GFP_THISNODE.
Also I noticed that the goal of patch 2 is already partially achieved
here, because alloc_huge_page_nodemask() will now allocate using
zonelist. It won't dequeue that way yet, though.
> ---
> commit dcd863b48fb2c93e5aebce818e75c30978e26cf1
> Author: Michal Hocko <mhocko@...e.com>
> Date: Wed Jun 14 15:41:07 2017 +0200
>
> fold me
>
> - pull gfp mask out of __hugetlb_alloc_buddy_huge_page and make it an
> explicit argument to allow __GFP_THISNODE in alloc_huge_page_node per
> Vlastimil
>
> diff --git a/mm/hugetlb.c b/mm/hugetlb.c
> index 3d5f25d589b3..afc87de5de5c 100644
> --- a/mm/hugetlb.c
> +++ b/mm/hugetlb.c
> @@ -1532,17 +1532,18 @@ int dissolve_free_huge_pages(unsigned long start_pfn, unsigned long end_pfn)
> }
>
> static struct page *__hugetlb_alloc_buddy_huge_page(struct hstate *h,
> - int nid, nodemask_t *nmask)
> + gfp_t gfp_mask, int nid, nodemask_t *nmask)
> {
> int order = huge_page_order(h);
> - gfp_t gfp = htlb_alloc_mask(h)|__GFP_COMP|__GFP_REPEAT|__GFP_NOWARN;
>
> + gfp_mask |= __GFP_COMP|__GFP_REPEAT|__GFP_NOWARN;
> if (nid == NUMA_NO_NODE)
> nid = numa_mem_id();
> - return __alloc_pages_nodemask(gfp, order, nid, nmask);
> + return __alloc_pages_nodemask(gfp_mask, order, nid, nmask);
> }
>
> -static struct page *__alloc_buddy_huge_page(struct hstate *h, int nid, nodemask_t *nmask)
> +static struct page *__alloc_buddy_huge_page(struct hstate *h, gfp_t gfp_mask,
> + int nid, nodemask_t *nmask)
> {
> struct page *page;
> unsigned int r_nid;
> @@ -1583,7 +1584,7 @@ static struct page *__alloc_buddy_huge_page(struct hstate *h, int nid, nodemask_
> }
> spin_unlock(&hugetlb_lock);
>
> - page = __hugetlb_alloc_buddy_huge_page(h, nid, nmask);
> + page = __hugetlb_alloc_buddy_huge_page(h, gfp_mask, nid, nmask);
>
> spin_lock(&hugetlb_lock);
> if (page) {
> @@ -1616,11 +1617,12 @@ struct page *__alloc_buddy_huge_page_with_mpol(struct hstate *h,
> {
> struct page *page;
> struct mempolicy *mpol;
> + gfp_t gfp_mask = htlb_alloc_mask(h);
> int nid;
> nodemask_t *nodemask;
>
> - nid = huge_node(vma, addr, htlb_alloc_mask(h), &mpol, &nodemask);
> - page = __alloc_buddy_huge_page(h, nid, nodemask);
> + nid = huge_node(vma, addr, gfp_mask, &mpol, &nodemask);
> + page = __alloc_buddy_huge_page(h, gfp_mask, nid, nodemask);
> mpol_cond_put(mpol);
>
> return page;
> @@ -1633,30 +1635,26 @@ struct page *__alloc_buddy_huge_page_with_mpol(struct hstate *h,
> */
> struct page *alloc_huge_page_node(struct hstate *h, int nid)
> {
> + gfp_t gfp_mask = htlb_alloc_mask(h);
> struct page *page = NULL;
>
> + if (nid != NUMA_NO_NODE)
> + gfp_mask |= __GFP_THISNODE;
> +
> spin_lock(&hugetlb_lock);
> if (h->free_huge_pages - h->resv_huge_pages > 0)
> page = dequeue_huge_page_node(h, nid);
> spin_unlock(&hugetlb_lock);
>
> - if (!page) {
> - nodemask_t nmask;
> -
> - if (nid != NUMA_NO_NODE) {
> - nmask = NODE_MASK_NONE;
> - node_set(nid, nmask);
> - } else {
> - nmask = node_states[N_MEMORY];
> - }
> - page = __alloc_buddy_huge_page(h, nid, &nmask);
> - }
> + if (!page)
> + page = __alloc_buddy_huge_page(h, gfp_mask, nid, NULL);
>
> return page;
> }
>
> struct page *alloc_huge_page_nodemask(struct hstate *h, nodemask_t *nmask)
> {
> + gfp_t gfp_mask = htlb_alloc_mask(h);
> struct page *page = NULL;
> int node;
>
> @@ -1673,7 +1671,7 @@ struct page *alloc_huge_page_nodemask(struct hstate *h, nodemask_t *nmask)
> return page;
>
> /* No reservations, try to overcommit */
> - return __alloc_buddy_huge_page(h, NUMA_NO_NODE, nmask);
> + return __alloc_buddy_huge_page(h, gfp_mask, NUMA_NO_NODE, nmask);
> }
>
> /*
> @@ -1701,7 +1699,8 @@ static int gather_surplus_pages(struct hstate *h, int delta)
> retry:
> spin_unlock(&hugetlb_lock);
> for (i = 0; i < needed; i++) {
> - page = __alloc_buddy_huge_page(h, NUMA_NO_NODE, NULL);
> + page = __alloc_buddy_huge_page(h, htlb_alloc_mask(h),
> + NUMA_NO_NODE, NULL);
> if (!page) {
> alloc_ok = false;
> break;
>
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