[v7,2/9] hugetlb_cgroup: add interface for charge/uncharge hugetlb reservations

Message ID	20191024202858.95342-2-almasrymina@google.com (mailing list archive)
State	New
Headers	show Return-Path: <SRS0=P0OL=YR=vger.kernel.org=linux-kselftest-owner@kernel.org> Date: Thu, 24 Oct 2019 13:28:51 -0700 In-Reply-To: <20191024202858.95342-1-almasrymina@google.com> Message-Id: <20191024202858.95342-2-almasrymina@google.com> Mime-Version: 1.0 References: <20191024202858.95342-1-almasrymina@google.com> Subject: [PATCH v7 2/9] hugetlb_cgroup: add interface for charge/uncharge hugetlb reservations From: Mina Almasry <almasrymina@google.com> To: mike.kravetz@oracle.com Cc: shuah@kernel.org, almasrymina@google.com, rientjes@google.com, shakeelb@google.com, gthelen@google.com, akpm@linux-foundation.org, khalid.aziz@oracle.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org, cgroups@vger.kernel.org, aneesh.kumar@linux.vnet.ibm.com, mkoutny@suse.com Content-Type: text/plain; charset="UTF-8" Sender: linux-kselftest-owner@vger.kernel.org Precedence: bulk
Series	[v7,1/9] hugetlb_cgroup: Add hugetlb_cgroup reservation counter \| expand [v7,1/9] hugetlb_cgroup: Add hugetlb_cgroup reservation counter [v7,2/9] hugetlb_cgroup: add interface for charge/uncharge hugetlb reservations [v7,3/9] hugetlb_cgroup: add cgroup-v2 support [v7,4/9] hugetlb_cgroup: add reservation accounting for private mappings [v7,5/9] hugetlb: disable region_add file_region coalescing [v7,6/9] hugetlb_cgroup: add accounting for shared mappings [v7,7/9] hugetlb_cgroup: support noreserve mappings [v7,8/9] hugetlb_cgroup: Add hugetlb_cgroup reservation tests [v7,9/9] hugetlb_cgroup: Add hugetlb_cgroup reservation docs

diff --git a/include/linux/hugetlb_cgroup.h b/include/linux/hugetlb_cgroup.h index 063962f6dfc6a..1bb58a63af586 100644 --- a/include/linux/hugetlb_cgroup.h +++ b/include/linux/hugetlb_cgroup.h @@ -22,27 +22,35 @@ struct hugetlb_cgroup; * Minimum page order trackable by hugetlb cgroup. * At least 3 pages are necessary for all the tracking information. */ -#define HUGETLB_CGROUP_MIN_ORDER 2 +#define HUGETLB_CGROUP_MIN_ORDER 3 #ifdef CONFIG_CGROUP_HUGETLB -static inline struct hugetlb_cgroup *hugetlb_cgroup_from_page(struct page *page) +static inline struct hugetlb_cgroup *hugetlb_cgroup_from_page(struct page *page, + bool reserved) { VM_BUG_ON_PAGE(!PageHuge(page), page); if (compound_order(page) < HUGETLB_CGROUP_MIN_ORDER) return NULL; - return (struct hugetlb_cgroup *)page[2].private; + if (reserved) + return (struct hugetlb_cgroup *)page[3].private; + else + return (struct hugetlb_cgroup *)page[2].private; } -static inline -int set_hugetlb_cgroup(struct page *page, struct hugetlb_cgroup *h_cg) +static inline int set_hugetlb_cgroup(struct page *page, + struct hugetlb_cgroup *h_cg, + bool reservation) { VM_BUG_ON_PAGE(!PageHuge(page), page); if (compound_order(page) < HUGETLB_CGROUP_MIN_ORDER) return -1; - page[2].private = (unsigned long)h_cg; + if (reservation) + page[3].private = (unsigned long)h_cg; + else + page[2].private = (unsigned long)h_cg; return 0; } @@ -52,26 +60,33 @@ static inline bool hugetlb_cgroup_disabled(void) } extern int hugetlb_cgroup_charge_cgroup(int idx, unsigned long nr_pages, - struct hugetlb_cgroup **ptr); + struct hugetlb_cgroup **ptr, + bool reserved); extern void hugetlb_cgroup_commit_charge(int idx, unsigned long nr_pages, struct hugetlb_cgroup *h_cg, - struct page *page); + struct page *page, bool reserved); extern void hugetlb_cgroup_uncharge_page(int idx, unsigned long nr_pages, - struct page *page); + struct page *page, bool reserved); + extern void hugetlb_cgroup_uncharge_cgroup(int idx, unsigned long nr_pages, - struct hugetlb_cgroup *h_cg); + struct hugetlb_cgroup *h_cg, + bool reserved); +extern void hugetlb_cgroup_uncharge_counter(struct page_counter *p, + unsigned long nr_pages); + extern void hugetlb_cgroup_file_init(void) __init; extern void hugetlb_cgroup_migrate(struct page *oldhpage, struct page *newhpage); #else -static inline struct hugetlb_cgroup *hugetlb_cgroup_from_page(struct page *page) +static inline struct hugetlb_cgroup *hugetlb_cgroup_from_page(struct page *page, + bool reserved) { return NULL; } -static inline -int set_hugetlb_cgroup(struct page *page, struct hugetlb_cgroup *h_cg) +static inline int set_hugetlb_cgroup(struct page *page, + struct hugetlb_cgroup *h_cg, bool reserved) { return 0; } @@ -81,28 +96,30 @@ static inline bool hugetlb_cgroup_disabled(void) return true; } -static inline int -hugetlb_cgroup_charge_cgroup(int idx, unsigned long nr_pages, - struct hugetlb_cgroup **ptr) +static inline int hugetlb_cgroup_charge_cgroup(int idx, unsigned long nr_pages, + struct hugetlb_cgroup **ptr, + bool reserved) { return 0; } -static inline void -hugetlb_cgroup_commit_charge(int idx, unsigned long nr_pages, - struct hugetlb_cgroup *h_cg, - struct page *page) +static inline void hugetlb_cgroup_commit_charge(int idx, unsigned long nr_pages, + struct hugetlb_cgroup *h_cg, + struct page *page, + bool reserved) { } -static inline void -hugetlb_cgroup_uncharge_page(int idx, unsigned long nr_pages, struct page *page) +static inline void hugetlb_cgroup_uncharge_page(int idx, unsigned long nr_pages, + struct page *page, + bool reserved) { } -static inline void -hugetlb_cgroup_uncharge_cgroup(int idx, unsigned long nr_pages, - struct hugetlb_cgroup *h_cg) +static inline void hugetlb_cgroup_uncharge_cgroup(int idx, + unsigned long nr_pages, + struct hugetlb_cgroup *h_cg, + bool reserved) { } diff --git a/mm/hugetlb.c b/mm/hugetlb.c index 37195cd60a345..325d5454bf168 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -1140,7 +1140,7 @@ static void update_and_free_page(struct hstate *h, struct page *page) 1 << PG_active | 1 << PG_private | 1 << PG_writeback); } - VM_BUG_ON_PAGE(hugetlb_cgroup_from_page(page), page); + VM_BUG_ON_PAGE(hugetlb_cgroup_from_page(page, false), page); set_compound_page_dtor(page, NULL_COMPOUND_DTOR); set_page_refcounted(page); if (hstate_is_gigantic(h)) { @@ -1250,8 +1250,8 @@ void free_huge_page(struct page *page) spin_lock(&hugetlb_lock); clear_page_huge_active(page); - hugetlb_cgroup_uncharge_page(hstate_index(h), - pages_per_huge_page(h), page); + hugetlb_cgroup_uncharge_page(hstate_index(h), pages_per_huge_page(h), + page, false); if (restore_reserve) h->resv_huge_pages++; @@ -1277,7 +1277,7 @@ static void prep_new_huge_page(struct hstate *h, struct page *page, int nid) INIT_LIST_HEAD(&page->lru); set_compound_page_dtor(page, HUGETLB_PAGE_DTOR); spin_lock(&hugetlb_lock); - set_hugetlb_cgroup(page, NULL); + set_hugetlb_cgroup(page, NULL, false); h->nr_huge_pages++; h->nr_huge_pages_node[nid]++; spin_unlock(&hugetlb_lock); @@ -2063,7 +2063,8 @@ struct page *alloc_huge_page(struct vm_area_struct *vma, gbl_chg = 1; } - ret = hugetlb_cgroup_charge_cgroup(idx, pages_per_huge_page(h), &h_cg); + ret = hugetlb_cgroup_charge_cgroup(idx, pages_per_huge_page(h), &h_cg, + false); if (ret) goto out_subpool_put; @@ -2087,7 +2088,8 @@ struct page *alloc_huge_page(struct vm_area_struct *vma, list_move(&page->lru, &h->hugepage_activelist); /* Fall through */ } - hugetlb_cgroup_commit_charge(idx, pages_per_huge_page(h), h_cg, page); + hugetlb_cgroup_commit_charge(idx, pages_per_huge_page(h), h_cg, page, + false); spin_unlock(&hugetlb_lock); set_page_private(page, (unsigned long)spool); @@ -2111,7 +2113,8 @@ struct page *alloc_huge_page(struct vm_area_struct *vma, return page; out_uncharge_cgroup: - hugetlb_cgroup_uncharge_cgroup(idx, pages_per_huge_page(h), h_cg); + hugetlb_cgroup_uncharge_cgroup(idx, pages_per_huge_page(h), h_cg, + false); out_subpool_put: if (map_chg || avoid_reserve) hugepage_subpool_put_pages(spool, 1); diff --git a/mm/hugetlb_cgroup.c b/mm/hugetlb_cgroup.c index 1ed4448ca41d3..854117513979b 100644 --- a/mm/hugetlb_cgroup.c +++ b/mm/hugetlb_cgroup.c @@ -73,8 +73,12 @@ static inline bool hugetlb_cgroup_have_usage(struct hugetlb_cgroup *h_cg) int idx; for (idx = 0; idx < hugetlb_max_hstate; idx++) { - if (page_counter_read(&h_cg->hugepage[idx])) + if (page_counter_read( + hugetlb_cgroup_get_counter(h_cg, idx, true)) || + page_counter_read( + hugetlb_cgroup_get_counter(h_cg, idx, false))) { return true; + } } return false; } @@ -85,18 +89,32 @@ static void hugetlb_cgroup_init(struct hugetlb_cgroup *h_cgroup, int idx; for (idx = 0; idx < HUGE_MAX_HSTATE; idx++) { - struct page_counter *counter = &h_cgroup->hugepage[idx]; struct page_counter *parent = NULL; + struct page_counter *reserved_parent = NULL; unsigned long limit; int ret; - if (parent_h_cgroup) - parent = &parent_h_cgroup->hugepage[idx]; - page_counter_init(counter, parent); + if (parent_h_cgroup) { + parent = hugetlb_cgroup_get_counter(parent_h_cgroup, + idx, false); + reserved_parent = hugetlb_cgroup_get_counter( + parent_h_cgroup, idx, true); + } + page_counter_init(hugetlb_cgroup_get_counter(h_cgroup, idx, + false), + parent); + page_counter_init(hugetlb_cgroup_get_counter(h_cgroup, idx, + true), + reserved_parent); limit = round_down(PAGE_COUNTER_MAX, 1 << huge_page_order(&hstates[idx])); - ret = page_counter_set_max(counter, limit); + + ret = page_counter_set_max( + hugetlb_cgroup_get_counter(h_cgroup, idx, false), + limit); + ret = page_counter_set_max( + hugetlb_cgroup_get_counter(h_cgroup, idx, true), limit); VM_BUG_ON(ret); } } @@ -126,6 +144,26 @@ static void hugetlb_cgroup_css_free(struct cgroup_subsys_state *css) kfree(h_cgroup); } +static void hugetlb_cgroup_move_parent_reservation(int idx, + struct hugetlb_cgroup *h_cg) +{ + struct hugetlb_cgroup *parent = parent_hugetlb_cgroup(h_cg); + + /* Move the reservation counters. */ + if (!parent_hugetlb_cgroup(h_cg)) { + parent = root_h_cgroup; + /* root has no limit */ + page_counter_charge( + &root_h_cgroup->reserved_hugepage[idx], + page_counter_read( + hugetlb_cgroup_get_counter(h_cg, idx, true))); + } + + /* Take the pages off the local counter */ + page_counter_cancel( + hugetlb_cgroup_get_counter(h_cg, idx, true), + page_counter_read(hugetlb_cgroup_get_counter(h_cg, idx, true))); +} /* * Should be called with hugetlb_lock held. @@ -142,7 +180,7 @@ static void hugetlb_cgroup_move_parent(int idx, struct hugetlb_cgroup *h_cg, struct hugetlb_cgroup *page_hcg; struct hugetlb_cgroup *parent = parent_hugetlb_cgroup(h_cg); - page_hcg = hugetlb_cgroup_from_page(page); + page_hcg = hugetlb_cgroup_from_page(page, false); /* * We can have pages in active list without any cgroup * ie, hugepage with less than 3 pages. We can safely @@ -161,7 +199,7 @@ static void hugetlb_cgroup_move_parent(int idx, struct hugetlb_cgroup *h_cg, /* Take the pages off the local counter */ page_counter_cancel(counter, nr_pages); - set_hugetlb_cgroup(page, parent); + set_hugetlb_cgroup(page, parent, false); out: return; } @@ -180,6 +218,7 @@ static void hugetlb_cgroup_css_offline(struct cgroup_subsys_state *css) do { for_each_hstate(h) { spin_lock(&hugetlb_lock); + hugetlb_cgroup_move_parent_reservation(idx, h_cg); list_for_each_entry(page, &h->hugepage_activelist, lru) hugetlb_cgroup_move_parent(idx, h_cg, page); @@ -191,7 +230,7 @@ static void hugetlb_cgroup_css_offline(struct cgroup_subsys_state *css) } int hugetlb_cgroup_charge_cgroup(int idx, unsigned long nr_pages, - struct hugetlb_cgroup **ptr) + struct hugetlb_cgroup **ptr, bool reserved) { int ret = 0; struct page_counter *counter; @@ -214,8 +253,11 @@ int hugetlb_cgroup_charge_cgroup(int idx, unsigned long nr_pages, } rcu_read_unlock(); - if (!page_counter_try_charge(&h_cg->hugepage[idx], nr_pages, &counter)) + if (!page_counter_try_charge(hugetlb_cgroup_get_counter(h_cg, idx, + reserved), + nr_pages, &counter)) { ret = -ENOMEM; + } css_put(&h_cg->css); done: *ptr = h_cg; @@ -225,12 +267,12 @@ int hugetlb_cgroup_charge_cgroup(int idx, unsigned long nr_pages, /* Should be called with hugetlb_lock held */ void hugetlb_cgroup_commit_charge(int idx, unsigned long nr_pages, struct hugetlb_cgroup *h_cg, - struct page *page) + struct page *page, bool reserved) { if (hugetlb_cgroup_disabled() || !h_cg) return; - set_hugetlb_cgroup(page, h_cg); + set_hugetlb_cgroup(page, h_cg, reserved); return; } @@ -238,23 +280,26 @@ void hugetlb_cgroup_commit_charge(int idx, unsigned long nr_pages, * Should be called with hugetlb_lock held */ void hugetlb_cgroup_uncharge_page(int idx, unsigned long nr_pages, - struct page *page) + struct page *page, bool reserved) { struct hugetlb_cgroup *h_cg; if (hugetlb_cgroup_disabled()) return; lockdep_assert_held(&hugetlb_lock); - h_cg = hugetlb_cgroup_from_page(page); + h_cg = hugetlb_cgroup_from_page(page, reserved); if (unlikely(!h_cg)) return; - set_hugetlb_cgroup(page, NULL); - page_counter_uncharge(&h_cg->hugepage[idx], nr_pages); + set_hugetlb_cgroup(page, NULL, reserved); + + page_counter_uncharge(hugetlb_cgroup_get_counter(h_cg, idx, reserved), + nr_pages); + return; } void hugetlb_cgroup_uncharge_cgroup(int idx, unsigned long nr_pages, - struct hugetlb_cgroup *h_cg) + struct hugetlb_cgroup *h_cg, bool reserved) { if (hugetlb_cgroup_disabled() || !h_cg) return; @@ -262,8 +307,17 @@ void hugetlb_cgroup_uncharge_cgroup(int idx, unsigned long nr_pages, if (huge_page_order(&hstates[idx]) < HUGETLB_CGROUP_MIN_ORDER) return; - page_counter_uncharge(&h_cg->hugepage[idx], nr_pages); - return; + page_counter_uncharge(hugetlb_cgroup_get_counter(h_cg, idx, reserved), + nr_pages); +} + +void hugetlb_cgroup_uncharge_counter(struct page_counter *p, + unsigned long nr_pages) +{ + if (hugetlb_cgroup_disabled() || !p) + return; + + page_counter_uncharge(p, nr_pages); } static u64 hugetlb_cgroup_read_u64(struct cgroup_subsys_state *css, @@ -475,6 +529,7 @@ void __init hugetlb_cgroup_file_init(void) void hugetlb_cgroup_migrate(struct page *oldhpage, struct page *newhpage) { struct hugetlb_cgroup *h_cg; + struct hugetlb_cgroup *h_cg_reservation; struct hstate *h = page_hstate(oldhpage); if (hugetlb_cgroup_disabled()) @@ -482,11 +537,12 @@ void hugetlb_cgroup_migrate(struct page *oldhpage, struct page *newhpage) VM_BUG_ON_PAGE(!PageHuge(oldhpage), oldhpage); spin_lock(&hugetlb_lock); - h_cg = hugetlb_cgroup_from_page(oldhpage); - set_hugetlb_cgroup(oldhpage, NULL); + h_cg = hugetlb_cgroup_from_page(oldhpage, false); + h_cg_reservation = hugetlb_cgroup_from_page(oldhpage, true); + set_hugetlb_cgroup(oldhpage, NULL, false); /* move the h_cg details to new cgroup */ - set_hugetlb_cgroup(newhpage, h_cg); + set_hugetlb_cgroup(newhpage, h_cg_reservation, true); list_move(&newhpage->lru, &h->hugepage_activelist); spin_unlock(&hugetlb_lock); return;

[v7,2/9] hugetlb_cgroup: add interface for charge/uncharge hugetlb reservations

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Patch