From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx130.postini.com [74.125.245.130]) by kanga.kvack.org (Postfix) with SMTP id 760166B00F0 for ; Fri, 16 Mar 2012 13:40:03 -0400 (EDT) Received: from /spool/local by e28smtp02.in.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Fri, 16 Mar 2012 23:10:00 +0530 Received: from d28av03.in.ibm.com (d28av03.in.ibm.com [9.184.220.65]) by d28relay01.in.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id q2GHdtI62629864 for ; Fri, 16 Mar 2012 23:09:55 +0530 Received: from d28av03.in.ibm.com (loopback [127.0.0.1]) by d28av03.in.ibm.com (8.14.4/8.13.1/NCO v10.0 AVout) with ESMTP id q2GN99Oc031188 for ; Sat, 17 Mar 2012 10:09:10 +1100 From: "Aneesh Kumar K.V" Subject: [PATCH -V4 08/10] hugetlbfs: Add a list for tracking in-use HugeTLB pages Date: Fri, 16 Mar 2012 23:09:28 +0530 Message-Id: <1331919570-2264-9-git-send-email-aneesh.kumar@linux.vnet.ibm.com> In-Reply-To: <1331919570-2264-1-git-send-email-aneesh.kumar@linux.vnet.ibm.com> References: <1331919570-2264-1-git-send-email-aneesh.kumar@linux.vnet.ibm.com> Sender: owner-linux-mm@kvack.org List-ID: To: linux-mm@kvack.org, mgorman@suse.de, kamezawa.hiroyu@jp.fujitsu.com, dhillf@gmail.com, aarcange@redhat.com, mhocko@suse.cz, akpm@linux-foundation.org, hannes@cmpxchg.org Cc: linux-kernel@vger.kernel.org, cgroups@vger.kernel.org, "Aneesh Kumar K.V" From: "Aneesh Kumar K.V" hugepage_activelist will be used to track currently used HugeTLB pages. We need to find the in-use HugeTLB pages to support memcg removal. On memcg removal we update the page's memory cgroup to point to parent cgroup. Signed-off-by: Aneesh Kumar K.V --- include/linux/hugetlb.h | 1 + mm/hugetlb.c | 23 ++++++++++++++++++----- 2 files changed, 19 insertions(+), 5 deletions(-) diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h index cbd8dc5..6919100 100644 --- a/include/linux/hugetlb.h +++ b/include/linux/hugetlb.h @@ -217,6 +217,7 @@ struct hstate { unsigned long resv_huge_pages; unsigned long surplus_huge_pages; unsigned long nr_overcommit_huge_pages; + struct list_head hugepage_activelist; struct list_head hugepage_freelists[MAX_NUMNODES]; unsigned int nr_huge_pages_node[MAX_NUMNODES]; unsigned int free_huge_pages_node[MAX_NUMNODES]; diff --git a/mm/hugetlb.c b/mm/hugetlb.c index 684849a..8fd465d 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -433,7 +433,7 @@ void copy_huge_page(struct page *dst, struct page *src) static void enqueue_huge_page(struct hstate *h, struct page *page) { int nid = page_to_nid(page); - list_add(&page->lru, &h->hugepage_freelists[nid]); + list_move(&page->lru, &h->hugepage_freelists[nid]); h->free_huge_pages++; h->free_huge_pages_node[nid]++; } @@ -445,7 +445,7 @@ static struct page *dequeue_huge_page_node(struct hstate *h, int nid) if (list_empty(&h->hugepage_freelists[nid])) return NULL; page = list_entry(h->hugepage_freelists[nid].next, struct page, lru); - list_del(&page->lru); + list_move(&page->lru, &h->hugepage_activelist); set_page_refcounted(page); h->free_huge_pages--; h->free_huge_pages_node[nid]--; @@ -542,13 +542,14 @@ static void free_huge_page(struct page *page) page->mapping = NULL; BUG_ON(page_count(page)); BUG_ON(page_mapcount(page)); - INIT_LIST_HEAD(&page->lru); if (mapping) mem_cgroup_hugetlb_uncharge_page(hstate_index(h), pages_per_huge_page(h), page); spin_lock(&hugetlb_lock); if (h->surplus_huge_pages_node[nid] && huge_page_order(h) < MAX_ORDER) { + /* remove the page from active list */ + list_del(&page->lru); update_and_free_page(h, page); h->surplus_huge_pages--; h->surplus_huge_pages_node[nid]--; @@ -562,6 +563,7 @@ static void free_huge_page(struct page *page) static void prep_new_huge_page(struct hstate *h, struct page *page, int nid) { + INIT_LIST_HEAD(&page->lru); set_compound_page_dtor(page, free_huge_page); spin_lock(&hugetlb_lock); h->nr_huge_pages++; @@ -1861,6 +1863,7 @@ void __init hugetlb_add_hstate(unsigned order) h->free_huge_pages = 0; for (i = 0; i < MAX_NUMNODES; ++i) INIT_LIST_HEAD(&h->hugepage_freelists[i]); + INIT_LIST_HEAD(&h->hugepage_activelist); h->next_nid_to_alloc = first_node(node_states[N_HIGH_MEMORY]); h->next_nid_to_free = first_node(node_states[N_HIGH_MEMORY]); snprintf(h->name, HSTATE_NAME_LEN, "hugepages-%lukB", @@ -2319,14 +2322,24 @@ void __unmap_hugepage_range(struct vm_area_struct *vma, unsigned long start, page = pte_page(pte); if (pte_dirty(pte)) set_page_dirty(page); - list_add(&page->lru, &page_list); + + spin_lock(&hugetlb_lock); + list_move(&page->lru, &page_list); + spin_unlock(&hugetlb_lock); } spin_unlock(&mm->page_table_lock); flush_tlb_range(vma, start, end); mmu_notifier_invalidate_range_end(mm, start, end); list_for_each_entry_safe(page, tmp, &page_list, lru) { page_remove_rmap(page); - list_del(&page->lru); + /* + * We need to move it back huge page active list. If we are + * holding the last reference, below put_page will move it + * back to free list. + */ + spin_lock(&hugetlb_lock); + list_move(&page->lru, &h->hugepage_activelist); + spin_unlock(&hugetlb_lock); put_page(page); } } -- 1.7.9 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: email@kvack.org