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Shutemov" , William Kucharski , Yang Huan , linux-kernel@vger.kernel.org, linux-mm@kvack.org Cc: kernel@vivo.com, Wang Qing Subject: [PATCH] mm/page_alloc: enable alloc bulk when page owner is on Date: Fri, 16 Jul 2021 16:17:53 +0800 Message-Id: <20210716081756.25419-1-link@vivo.com> X-Mailer: git-send-email 2.32.0 MIME-Version: 1.0 X-HM-Spam-Status: e1kfGhgUHx5ZQUtXWQgPGg8OCBgUHx5ZQUlOS1dZCBgUCR5ZQVlLVUtZV1 kWDxoPAgseWUFZKDYvK1lXWShZQUhPN1dZLVlBSVdZDwkaFQgSH1lBWUMeGEhWGh9IGRoZGB9MGU 1OVRMBExYaEhckFA4PWVdZFhoPEhUdFFlBWU9LSFVKSktISkxVS1kG X-HM-Sender-Digest: e1kMHhlZQR0aFwgeV1kSHx4VD1lBWUc6Mio6EAw4LD9JMg8BFikUTksw NU9PFDdVSlVKTUlNT0lIT0JNSEpOVTMWGhIXVRcSFRA7DRINFFUYFBZFWVdZEgtZQVlITVVKTklV Sk9OVUpDS1lXWQgBWUFKS0xNSDcG X-HM-Tid: 0a7aae650d16b037kuuub2fc08014e Content-Transfer-Encoding: quoted-printable Authentication-Results: imf25.hostedemail.com; dkim=none ("invalid DKIM record") header.d=vivo.com header.s=default header.b=aOPdwd1j; spf=pass (imf25.hostedemail.com: domain of link@vivo.com designates 115.236.121.142 as permitted sender) smtp.mailfrom=link@vivo.com; dmarc=pass (policy=none) header.from=vivo.com X-Rspamd-Server: rspam02 X-Stat-Signature: hma7wc11b687yu7agrmhxptsatikewap X-Rspamd-Queue-Id: 6F30DB0002AC X-HE-Tag: 1626423501-618292 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Last alloc bulk version have a bug, when page_owner is on, system maybe crashed due to alloc bulk invoke prep_new_page in irq disabled context, and set_page_owner use page_flag(may GFP_KERNEL) to get memory and save stacktrace. We fix it by a circumvention plan -- bandon alloc bulk feature when page_owner is set. I think both alloc_bulk and page_owner is valuable, so, it's worth to find a way enable alloc bulk when page owner is on. The original bug as Zhang, Qiang reported BUG: sleeping function called from invalid context at mm/page_alloc.c:5= 179 in_atomic(): 0, irqs_disabled(): 1, non_block: 0, pid: 1, name: swapper= /0 ..... __dump_stack lib/dump_stack.c:79 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:96 ___might_sleep.cold+0x1f1/0x237 kernel/sched/core.c:9153 prepare_alloc_pages+0x3da/0x580 mm/page_alloc.c:5179 __alloc_pages+0x12f/0x500 mm/page_alloc.c:5375 alloc_page_interleave+0x1e/0x200 mm/mempolicy.c:2147 alloc_pages+0x238/0x2a0 mm/mempolicy.c:2270 stack_depot_save+0x39d/0x4e0 lib/stackdepot.c:303 save_stack+0x15e/0x1e0 mm/page_owner.c:120 __set_page_owner+0x50/0x290 mm/page_owner.c:181 prep_new_page mm/page_alloc.c:2445 [inline] __alloc_pages_bulk+0x8b9/0x1870 mm/page_alloc.c:5313 alloc_pages_bulk_array_node include/linux/gfp.h:557 [inline] vm_area_alloc_pages mm/vmalloc.c:2775 [inline] __vmalloc_area_node mm/vmalloc.c:2845 [inline] __vmalloc_node_range+0x39d/0x960 mm/vmalloc.c:2947 __vmalloc_node mm/vmalloc.c:2996 [inline] vzalloc+0x67/0x80 mm/vmalloc.c:3066 Actually, the problem is caused by set_page_owner alloc memory to save stack with GFP_KERNEL in local_riq disabled. So, we just can't assume that alloc flags should be same with new page, prep_new_page should prep/trace the page gfp, but shouldn't use the same gfp to get memory, let's depend on caller. Now, here is two gfp flags, alloc_gfp used to alloc memory, depend on caller, page_gfp is page's gfp, used to trace/prep itself. In most situation, alloc_gfp same is ok, in alloc_pages_bulk, use GFP_ATOMIC, due to irq is disabled. Notice: GFP_ATOMIC may cause alloc_bulk pages lost page owner stacktrace when memory get failed due to can't reclaim memory. But, Actually, we are in irq context, can't relcaim memory is true, use GFP_ATOMIC is appropriate. Now that we fixed bug, let's enabled alloc bulk when page_owner is on. Suggested-by: Wang Qing Signed-off-by: Yang Huan --- include/linux/page_owner.h | 8 ++++---- mm/compaction.c | 2 +- mm/internal.h | 2 +- mm/page_alloc.c | 36 ++++++++++++------------------------ mm/page_owner.c | 6 +++--- 5 files changed, 21 insertions(+), 33 deletions(-) diff --git a/include/linux/page_owner.h b/include/linux/page_owner.h index 719bfe5108c5..76669c272b4b 100644 --- a/include/linux/page_owner.h +++ b/include/linux/page_owner.h @@ -10,7 +10,7 @@ extern struct page_ext_operations page_owner_ops; =20 extern void __reset_page_owner(struct page *page, unsigned int order); extern void __set_page_owner(struct page *page, - unsigned int order, gfp_t gfp_mask); + unsigned int order, gfp_t alloc_gfp, gfp_t page_gfp); extern void __split_page_owner(struct page *page, unsigned int nr); extern void __copy_page_owner(struct page *oldpage, struct page *newpage= ); extern void __set_page_owner_migrate_reason(struct page *page, int reaso= n); @@ -25,10 +25,10 @@ static inline void reset_page_owner(struct page *page= , unsigned int order) } =20 static inline void set_page_owner(struct page *page, - unsigned int order, gfp_t gfp_mask) + unsigned int order, gfp_t alloc_gfp, gfp_t page_gfp) { if (static_branch_unlikely(&page_owner_inited)) - __set_page_owner(page, order, gfp_mask); + __set_page_owner(page, order, alloc_gfp, page_gfp); } =20 static inline void split_page_owner(struct page *page, unsigned int nr) @@ -56,7 +56,7 @@ static inline void reset_page_owner(struct page *page, = unsigned int order) { } static inline void set_page_owner(struct page *page, - unsigned int order, gfp_t gfp_mask) + unsigned int order, gfp_t alloc_gfp, gfp_t page_gfp) { } static inline void split_page_owner(struct page *page, diff --git a/mm/compaction.c b/mm/compaction.c index 79aaf21058da..187869e21690 100644 --- a/mm/compaction.c +++ b/mm/compaction.c @@ -96,7 +96,7 @@ static void split_map_pages(struct list_head *list) order =3D page_private(page); nr_pages =3D 1 << order; =20 - post_alloc_hook(page, order, __GFP_MOVABLE); + post_alloc_hook(page, order, __GFP_MOVABLE, __GFP_MOVABLE); if (order) split_page(page, order); =20 diff --git a/mm/internal.h b/mm/internal.h index cf3cb933eba3..7eaf18b1fa2f 100644 --- a/mm/internal.h +++ b/mm/internal.h @@ -200,7 +200,7 @@ extern void memblock_free_pages(struct page *page, un= signed long pfn, extern void __free_pages_core(struct page *page, unsigned int order); extern void prep_compound_page(struct page *page, unsigned int order); extern void post_alloc_hook(struct page *page, unsigned int order, - gfp_t gfp_flags); + gfp_t alloc_gfp, gfp_t page_gfp); extern int user_min_free_kbytes; =20 extern void free_unref_page(struct page *page, unsigned int order); diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 62dc229c1dd1..03bcb7f34fa6 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -2384,7 +2384,7 @@ static bool check_new_pages(struct page *page, unsi= gned int order) } =20 inline void post_alloc_hook(struct page *page, unsigned int order, - gfp_t gfp_flags) + gfp_t alloc_gfp, gfp_t page_gfp) { set_page_private(page, 0); set_page_refcounted(page); @@ -2405,25 +2405,25 @@ inline void post_alloc_hook(struct page *page, un= signed int order, * kept together to avoid discrepancies in behavior. */ if (kasan_has_integrated_init()) { - kasan_alloc_pages(page, order, gfp_flags); + kasan_alloc_pages(page, order, page_gfp); } else { - bool init =3D !want_init_on_free() && want_init_on_alloc(gfp_flags); + bool init =3D !want_init_on_free() && want_init_on_alloc(page_gfp); =20 kasan_unpoison_pages(page, order, init); if (init) kernel_init_free_pages(page, 1 << order, - gfp_flags & __GFP_ZEROTAGS); + page_gfp & __GFP_ZEROTAGS); } =20 - set_page_owner(page, order, gfp_flags); + set_page_owner(page, order, alloc_gfp, page_gfp); } =20 -static void prep_new_page(struct page *page, unsigned int order, gfp_t g= fp_flags, - unsigned int alloc_flags) +static void prep_new_page(struct page *page, unsigned int order, gfp_t a= lloc_gfp, + gfp_t page_gfp, unsigned int alloc_flags) { - post_alloc_hook(page, order, gfp_flags); + post_alloc_hook(page, order, alloc_gfp, page_gfp); =20 - if (order && (gfp_flags & __GFP_COMP)) + if (order && (page_gfp & __GFP_COMP)) prep_compound_page(page, order); =20 /* @@ -4149,7 +4149,7 @@ get_page_from_freelist(gfp_t gfp_mask, unsigned int= order, int alloc_flags, page =3D rmqueue(ac->preferred_zoneref->zone, zone, order, gfp_mask, alloc_flags, ac->migratetype); if (page) { - prep_new_page(page, order, gfp_mask, alloc_flags); + prep_new_page(page, order, gfp_mask, gfp_mask, alloc_flags); =20 /* * If this is a high-order atomic allocation then check @@ -4369,7 +4369,7 @@ __alloc_pages_direct_compact(gfp_t gfp_mask, unsign= ed int order, =20 /* Prep a captured page if available */ if (page) - prep_new_page(page, order, gfp_mask, alloc_flags); + prep_new_page(page, order, gfp_mask, gfp_mask, alloc_flags); =20 /* Try get a page from the freelist if available */ if (!page) @@ -5226,18 +5226,6 @@ unsigned long __alloc_pages_bulk(gfp_t gfp, int pr= eferred_nid, if (nr_pages - nr_populated =3D=3D 1) goto failed; =20 -#ifdef CONFIG_PAGE_OWNER - /* - * PAGE_OWNER may recurse into the allocator to allocate space to - * save the stack with pagesets.lock held. Releasing/reacquiring - * removes much of the performance benefit of bulk allocation so - * force the caller to allocate one page at a time as it'll have - * similar performance to added complexity to the bulk allocator. - */ - if (static_branch_unlikely(&page_owner_inited)) - goto failed; -#endif - /* May set ALLOC_NOFRAGMENT, fragmentation will return 1 page. */ gfp &=3D gfp_allowed_mask; alloc_gfp =3D gfp; @@ -5297,7 +5285,7 @@ unsigned long __alloc_pages_bulk(gfp_t gfp, int pre= ferred_nid, } nr_account++; =20 - prep_new_page(page, 0, gfp, 0); + prep_new_page(page, 0, GFP_ATOMIC, gfp, 0); if (page_list) list_add(&page->lru, page_list); else diff --git a/mm/page_owner.c b/mm/page_owner.c index 62402d22539b..3c7419b72c76 100644 --- a/mm/page_owner.c +++ b/mm/page_owner.c @@ -170,7 +170,7 @@ static inline void __set_page_owner_handle(struct pag= e_ext *page_ext, } =20 noinline void __set_page_owner(struct page *page, unsigned int order, - gfp_t gfp_mask) + gfp_t alloc_gfp, gfp_t page_gfp) { struct page_ext *page_ext =3D lookup_page_ext(page); depot_stack_handle_t handle; @@ -178,8 +178,8 @@ noinline void __set_page_owner(struct page *page, uns= igned int order, if (unlikely(!page_ext)) return; =20 - handle =3D save_stack(gfp_mask); - __set_page_owner_handle(page_ext, handle, order, gfp_mask); + handle =3D save_stack(alloc_gfp); + __set_page_owner_handle(page_ext, handle, order, page_gfp); } =20 void __set_page_owner_migrate_reason(struct page *page, int reason) --=20 2.32.0