From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8CAD8C433B4 for ; Fri, 30 Apr 2021 05:56:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6D7A46147E for ; Fri, 30 Apr 2021 05:56:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230284AbhD3F5l (ORCPT ); Fri, 30 Apr 2021 01:57:41 -0400 Received: from mail.kernel.org ([198.145.29.99]:50480 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230215AbhD3F5k (ORCPT ); Fri, 30 Apr 2021 01:57:40 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 79F1C610FC; Fri, 30 Apr 2021 05:56:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1619762212; bh=OIa60qXYRziHPkoCedA/pF5l8j2BVuxrkPYHw2J1L6U=; h=Date:From:To:Subject:In-Reply-To:From; b=W/ZrYcufX/2dzBAZk8uCYxMSzNFWXqxd3y70fHmz2rJo7QO2G5KjcD2QtGTJDEWqG bTi031Ub++VtkvWXHiVGn4oumQwfod4YhgABrZsOkKfjFLzx1vRq+PpnWIWgboSteC 1OViamYQRc6BFfmm/F96Xs4mnUPplaUNk0WLgdbk= Date: Thu, 29 Apr 2021 22:56:52 -0700 From: Andrew Morton To: akpm@linux-foundation.org, borntraeger@de.ibm.com, duanxiongchun@bytedance.com, guro@fb.com, hannes@cmpxchg.org, linmiaohe@huawei.com, linux-mm@kvack.org, mhocko@kernel.org, mm-commits@vger.kernel.org, shakeelb@google.com, songmuchun@bytedance.com, torvalds@linux-foundation.org, vdavydov.dev@gmail.com Subject: [patch 072/178] mm: memcontrol: use obj_cgroup APIs to charge kmem pages Message-ID: <20210430055652.278jEq0w7%akpm@linux-foundation.org> In-Reply-To: <20210429225251.02b6386d21b69255b4f6c163@linux-foundation.org> User-Agent: s-nail v14.8.16 Precedence: bulk Reply-To: linux-kernel@vger.kernel.org List-ID: X-Mailing-List: mm-commits@vger.kernel.org From: Muchun Song Subject: mm: memcontrol: use obj_cgroup APIs to charge kmem pages Since Roman's series "The new cgroup slab memory controller" applied. All slab objects are charged via the new APIs of obj_cgroup. The new APIs introduce a struct obj_cgroup to charge slab objects. It prevents long-living objects from pinning the original memory cgroup in the memory. But there are still some corner objects (e.g. allocations larger than order-1 page on SLUB) which are not charged via the new APIs. Those objects (include the pages which are allocated from buddy allocator directly) are charged as kmem pages which still hold a reference to the memory cgroup. We want to reuse the obj_cgroup APIs to charge the kmem pages. If we do that, we should store an object cgroup pointer to page->memcg_data for the kmem pages. Finally, page->memcg_data will have 3 different meanings. 1) For the slab pages, page->memcg_data points to an object cgroups vector. 2) For the kmem pages (exclude the slab pages), page->memcg_data points to an object cgroup. 3) For the user pages (e.g. the LRU pages), page->memcg_data points to a memory cgroup. We do not change the behavior of page_memcg() and page_memcg_rcu(). They are also suitable for LRU pages and kmem pages. Why? Because memory allocations pinning memcgs for a long time - it exists at a larger scale and is causing recurring problems in the real world: page cache doesn't get reclaimed for a long time, or is used by the second, third, fourth, ... instance of the same job that was restarted into a new cgroup every time. Unreclaimable dying cgroups pile up, waste memory, and make page reclaim very inefficient. We can convert LRU pages and most other raw memcg pins to the objcg direction to fix this problem, and then the page->memcg will always point to an object cgroup pointer. At that time, LRU pages and kmem pages will be treated the same. The implementation of page_memcg() will remove the kmem page check. This patch aims to charge the kmem pages by using the new APIs of obj_cgroup. Finally, the page->memcg_data of the kmem page points to an object cgroup. We can use the __page_objcg() to get the object cgroup associated with a kmem page. Or we can use page_memcg() to get the memory cgroup associated with a kmem page, but caller must ensure that the returned memcg won't be released (e.g. acquire the rcu_read_lock or css_set_lock). Link: https://lkml.kernel.org/r/20210319163821.20704-6-songmuchun@bytedance.com Signed-off-by: Muchun Song Acked-by: Johannes Weiner Reviewed-by: Shakeel Butt Acked-by: Roman Gushchin Reviewed-by: Miaohe Lin Cc: Michal Hocko Cc: Vladimir Davydov Cc: Xiongchun Duan Cc: Christian Borntraeger [songmuchun@bytedance.com: fix forget to obtain the ref to objcg in split_page_memcg] Link: https://lkml.kernel.org/r/20210401030141.37061-1-songmuchun@bytedance.com Signed-off-by: Andrew Morton --- include/linux/memcontrol.h | 120 ++++++++++++++++++++++++++++------- mm/memcontrol.c | 116 ++++++++++++++++----------------- 2 files changed, 155 insertions(+), 81 deletions(-) --- a/include/linux/memcontrol.h~mm-memcontrol-use-obj_cgroup-apis-to-charge-kmem-pages +++ a/include/linux/memcontrol.h @@ -371,6 +371,62 @@ enum page_memcg_data_flags { #define MEMCG_DATA_FLAGS_MASK (__NR_MEMCG_DATA_FLAGS - 1) +static inline bool PageMemcgKmem(struct page *page); + +/* + * After the initialization objcg->memcg is always pointing at + * a valid memcg, but can be atomically swapped to the parent memcg. + * + * The caller must ensure that the returned memcg won't be released: + * e.g. acquire the rcu_read_lock or css_set_lock. + */ +static inline struct mem_cgroup *obj_cgroup_memcg(struct obj_cgroup *objcg) +{ + return READ_ONCE(objcg->memcg); +} + +/* + * __page_memcg - get the memory cgroup associated with a non-kmem page + * @page: a pointer to the page struct + * + * Returns a pointer to the memory cgroup associated with the page, + * or NULL. This function assumes that the page is known to have a + * proper memory cgroup pointer. It's not safe to call this function + * against some type of pages, e.g. slab pages or ex-slab pages or + * kmem pages. + */ +static inline struct mem_cgroup *__page_memcg(struct page *page) +{ + unsigned long memcg_data = page->memcg_data; + + VM_BUG_ON_PAGE(PageSlab(page), page); + VM_BUG_ON_PAGE(memcg_data & MEMCG_DATA_OBJCGS, page); + VM_BUG_ON_PAGE(memcg_data & MEMCG_DATA_KMEM, page); + + return (struct mem_cgroup *)(memcg_data & ~MEMCG_DATA_FLAGS_MASK); +} + +/* + * __page_objcg - get the object cgroup associated with a kmem page + * @page: a pointer to the page struct + * + * Returns a pointer to the object cgroup associated with the page, + * or NULL. This function assumes that the page is known to have a + * proper object cgroup pointer. It's not safe to call this function + * against some type of pages, e.g. slab pages or ex-slab pages or + * LRU pages. + */ +static inline struct obj_cgroup *__page_objcg(struct page *page) +{ + unsigned long memcg_data = page->memcg_data; + + VM_BUG_ON_PAGE(PageSlab(page), page); + VM_BUG_ON_PAGE(memcg_data & MEMCG_DATA_OBJCGS, page); + VM_BUG_ON_PAGE(!(memcg_data & MEMCG_DATA_KMEM), page); + + return (struct obj_cgroup *)(memcg_data & ~MEMCG_DATA_FLAGS_MASK); +} + /* * page_memcg - get the memory cgroup associated with a page * @page: a pointer to the page struct @@ -380,20 +436,23 @@ enum page_memcg_data_flags { * proper memory cgroup pointer. It's not safe to call this function * against some type of pages, e.g. slab pages or ex-slab pages. * - * Any of the following ensures page and memcg binding stability: + * For a non-kmem page any of the following ensures page and memcg binding + * stability: + * * - the page lock * - LRU isolation * - lock_page_memcg() * - exclusive reference + * + * For a kmem page a caller should hold an rcu read lock to protect memcg + * associated with a kmem page from being released. */ static inline struct mem_cgroup *page_memcg(struct page *page) { - unsigned long memcg_data = page->memcg_data; - - VM_BUG_ON_PAGE(PageSlab(page), page); - VM_BUG_ON_PAGE(memcg_data & MEMCG_DATA_OBJCGS, page); - - return (struct mem_cgroup *)(memcg_data & ~MEMCG_DATA_FLAGS_MASK); + if (PageMemcgKmem(page)) + return obj_cgroup_memcg(__page_objcg(page)); + else + return __page_memcg(page); } /* @@ -407,11 +466,19 @@ static inline struct mem_cgroup *page_me */ static inline struct mem_cgroup *page_memcg_rcu(struct page *page) { + unsigned long memcg_data = READ_ONCE(page->memcg_data); + VM_BUG_ON_PAGE(PageSlab(page), page); WARN_ON_ONCE(!rcu_read_lock_held()); - return (struct mem_cgroup *)(READ_ONCE(page->memcg_data) & - ~MEMCG_DATA_FLAGS_MASK); + if (memcg_data & MEMCG_DATA_KMEM) { + struct obj_cgroup *objcg; + + objcg = (void *)(memcg_data & ~MEMCG_DATA_FLAGS_MASK); + return obj_cgroup_memcg(objcg); + } + + return (struct mem_cgroup *)(memcg_data & ~MEMCG_DATA_FLAGS_MASK); } /* @@ -419,15 +486,21 @@ static inline struct mem_cgroup *page_me * @page: a pointer to the page struct * * Returns a pointer to the memory cgroup associated with the page, - * or NULL. This function unlike page_memcg() can take any page + * or NULL. This function unlike page_memcg() can take any page * as an argument. It has to be used in cases when it's not known if a page - * has an associated memory cgroup pointer or an object cgroups vector. + * has an associated memory cgroup pointer or an object cgroups vector or + * an object cgroup. + * + * For a non-kmem page any of the following ensures page and memcg binding + * stability: * - * Any of the following ensures page and memcg binding stability: * - the page lock * - LRU isolation * - lock_page_memcg() * - exclusive reference + * + * For a kmem page a caller should hold an rcu read lock to protect memcg + * associated with a kmem page from being released. */ static inline struct mem_cgroup *page_memcg_check(struct page *page) { @@ -440,6 +513,13 @@ static inline struct mem_cgroup *page_me if (memcg_data & MEMCG_DATA_OBJCGS) return NULL; + if (memcg_data & MEMCG_DATA_KMEM) { + struct obj_cgroup *objcg; + + objcg = (void *)(memcg_data & ~MEMCG_DATA_FLAGS_MASK); + return obj_cgroup_memcg(objcg); + } + return (struct mem_cgroup *)(memcg_data & ~MEMCG_DATA_FLAGS_MASK); } @@ -718,21 +798,15 @@ static inline void obj_cgroup_get(struct percpu_ref_get(&objcg->refcnt); } -static inline void obj_cgroup_put(struct obj_cgroup *objcg) +static inline void obj_cgroup_get_many(struct obj_cgroup *objcg, + unsigned long nr) { - percpu_ref_put(&objcg->refcnt); + percpu_ref_get_many(&objcg->refcnt, nr); } -/* - * After the initialization objcg->memcg is always pointing at - * a valid memcg, but can be atomically swapped to the parent memcg. - * - * The caller must ensure that the returned memcg won't be released: - * e.g. acquire the rcu_read_lock or css_set_lock. - */ -static inline struct mem_cgroup *obj_cgroup_memcg(struct obj_cgroup *objcg) +static inline void obj_cgroup_put(struct obj_cgroup *objcg) { - return READ_ONCE(objcg->memcg); + percpu_ref_put(&objcg->refcnt); } static inline void mem_cgroup_put(struct mem_cgroup *memcg) --- a/mm/memcontrol.c~mm-memcontrol-use-obj_cgroup-apis-to-charge-kmem-pages +++ a/mm/memcontrol.c @@ -865,18 +865,22 @@ void __mod_lruvec_page_state(struct page int val) { struct page *head = compound_head(page); /* rmap on tail pages */ - struct mem_cgroup *memcg = page_memcg(head); + struct mem_cgroup *memcg; pg_data_t *pgdat = page_pgdat(page); struct lruvec *lruvec; + rcu_read_lock(); + memcg = page_memcg(head); /* Untracked pages have no memcg, no lruvec. Update only the node */ if (!memcg) { + rcu_read_unlock(); __mod_node_page_state(pgdat, idx, val); return; } lruvec = mem_cgroup_lruvec(memcg, pgdat); __mod_lruvec_state(lruvec, idx, val); + rcu_read_unlock(); } EXPORT_SYMBOL(__mod_lruvec_page_state); @@ -1051,20 +1055,6 @@ static __always_inline struct mem_cgroup return current->active_memcg; } -static __always_inline struct mem_cgroup *get_active_memcg(void) -{ - struct mem_cgroup *memcg; - - rcu_read_lock(); - memcg = active_memcg(); - /* remote memcg must hold a ref. */ - if (memcg && WARN_ON_ONCE(!css_tryget(&memcg->css))) - memcg = root_mem_cgroup; - rcu_read_unlock(); - - return memcg; -} - static __always_inline bool memcg_kmem_bypass(void) { /* Allow remote memcg charging from any context. */ @@ -1079,20 +1069,6 @@ static __always_inline bool memcg_kmem_b } /** - * If active memcg is set, do not fallback to current->mm->memcg. - */ -static __always_inline struct mem_cgroup *get_mem_cgroup_from_current(void) -{ - if (memcg_kmem_bypass()) - return NULL; - - if (unlikely(active_memcg())) - return get_active_memcg(); - - return get_mem_cgroup_from_mm(current->mm); -} - -/** * mem_cgroup_iter - iterate over memory cgroup hierarchy * @root: hierarchy root * @prev: previously returned memcg, NULL on first invocation @@ -3121,18 +3097,18 @@ static void __memcg_kmem_uncharge(struct */ int __memcg_kmem_charge_page(struct page *page, gfp_t gfp, int order) { - struct mem_cgroup *memcg; + struct obj_cgroup *objcg; int ret = 0; - memcg = get_mem_cgroup_from_current(); - if (memcg && !mem_cgroup_is_root(memcg)) { - ret = __memcg_kmem_charge(memcg, gfp, 1 << order); + objcg = get_obj_cgroup_from_current(); + if (objcg) { + ret = obj_cgroup_charge_pages(objcg, gfp, 1 << order); if (!ret) { - page->memcg_data = (unsigned long)memcg | + page->memcg_data = (unsigned long)objcg | MEMCG_DATA_KMEM; return 0; } - css_put(&memcg->css); + obj_cgroup_put(objcg); } return ret; } @@ -3144,16 +3120,16 @@ int __memcg_kmem_charge_page(struct page */ void __memcg_kmem_uncharge_page(struct page *page, int order) { - struct mem_cgroup *memcg = page_memcg(page); + struct obj_cgroup *objcg; unsigned int nr_pages = 1 << order; - if (!memcg) + if (!PageMemcgKmem(page)) return; - VM_BUG_ON_PAGE(mem_cgroup_is_root(memcg), page); - __memcg_kmem_uncharge(memcg, nr_pages); + objcg = __page_objcg(page); + obj_cgroup_uncharge_pages(objcg, nr_pages); page->memcg_data = 0; - css_put(&memcg->css); + obj_cgroup_put(objcg); } static bool consume_obj_stock(struct obj_cgroup *objcg, unsigned int nr_bytes) @@ -3294,7 +3270,11 @@ void split_page_memcg(struct page *head, for (i = 1; i < nr; i++) head[i].memcg_data = head->memcg_data; - css_get_many(&memcg->css, nr - 1); + + if (PageMemcgKmem(head)) + obj_cgroup_get_many(__page_objcg(head), nr - 1); + else + css_get_many(&memcg->css, nr - 1); } #ifdef CONFIG_MEMCG_SWAP @@ -6788,7 +6768,7 @@ void mem_cgroup_swapin_uncharge_swap(swp struct uncharge_gather { struct mem_cgroup *memcg; - unsigned long nr_pages; + unsigned long nr_memory; unsigned long pgpgout; unsigned long nr_kmem; struct page *dummy_page; @@ -6803,10 +6783,10 @@ static void uncharge_batch(const struct { unsigned long flags; - if (!mem_cgroup_is_root(ug->memcg)) { - page_counter_uncharge(&ug->memcg->memory, ug->nr_pages); + if (ug->nr_memory) { + page_counter_uncharge(&ug->memcg->memory, ug->nr_memory); if (do_memsw_account()) - page_counter_uncharge(&ug->memcg->memsw, ug->nr_pages); + page_counter_uncharge(&ug->memcg->memsw, ug->nr_memory); if (!cgroup_subsys_on_dfl(memory_cgrp_subsys) && ug->nr_kmem) page_counter_uncharge(&ug->memcg->kmem, ug->nr_kmem); memcg_oom_recover(ug->memcg); @@ -6814,7 +6794,7 @@ static void uncharge_batch(const struct local_irq_save(flags); __count_memcg_events(ug->memcg, PGPGOUT, ug->pgpgout); - __this_cpu_add(ug->memcg->vmstats_percpu->nr_page_events, ug->nr_pages); + __this_cpu_add(ug->memcg->vmstats_percpu->nr_page_events, ug->nr_memory); memcg_check_events(ug->memcg, ug->dummy_page); local_irq_restore(flags); @@ -6825,40 +6805,60 @@ static void uncharge_batch(const struct static void uncharge_page(struct page *page, struct uncharge_gather *ug) { unsigned long nr_pages; + struct mem_cgroup *memcg; + struct obj_cgroup *objcg; VM_BUG_ON_PAGE(PageLRU(page), page); - if (!page_memcg(page)) - return; - /* * Nobody should be changing or seriously looking at - * page_memcg(page) at this point, we have fully + * page memcg or objcg at this point, we have fully * exclusive access to the page. */ + if (PageMemcgKmem(page)) { + objcg = __page_objcg(page); + /* + * This get matches the put at the end of the function and + * kmem pages do not hold memcg references anymore. + */ + memcg = get_mem_cgroup_from_objcg(objcg); + } else { + memcg = __page_memcg(page); + } - if (ug->memcg != page_memcg(page)) { + if (!memcg) + return; + + if (ug->memcg != memcg) { if (ug->memcg) { uncharge_batch(ug); uncharge_gather_clear(ug); } - ug->memcg = page_memcg(page); + ug->memcg = memcg; ug->dummy_page = page; /* pairs with css_put in uncharge_batch */ - css_get(&ug->memcg->css); + css_get(&memcg->css); } nr_pages = compound_nr(page); - ug->nr_pages += nr_pages; - if (PageMemcgKmem(page)) + if (PageMemcgKmem(page)) { + ug->nr_memory += nr_pages; ug->nr_kmem += nr_pages; - else + + page->memcg_data = 0; + obj_cgroup_put(objcg); + } else { + /* LRU pages aren't accounted at the root level */ + if (!mem_cgroup_is_root(memcg)) + ug->nr_memory += nr_pages; ug->pgpgout++; - page->memcg_data = 0; - css_put(&ug->memcg->css); + page->memcg_data = 0; + } + + css_put(&memcg->css); } /** _