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=-17.0 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 1B533C4332D for ; Wed, 10 Mar 2021 16:15:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id EFBCF64FBB for ; Wed, 10 Mar 2021 16:15:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232940AbhCJQOs (ORCPT ); Wed, 10 Mar 2021 11:14:48 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54654 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231366AbhCJQOj (ORCPT ); Wed, 10 Mar 2021 11:14:39 -0500 Received: from mail-pg1-x534.google.com (mail-pg1-x534.google.com [IPv6:2607:f8b0:4864:20::534]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 46878C061760; Wed, 10 Mar 2021 08:14:39 -0800 (PST) Received: by mail-pg1-x534.google.com with SMTP id w34so10640768pga.8; Wed, 10 Mar 2021 08:14:39 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=sender:from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=2lZIChPtI3p/aQ6I3GH7R9vIF95h/LXfK2s4My5ecFY=; b=PpJW7kp5pzBkHhRmXGWgHhfCoR5r78l0ND0ggR1yOLv9HV1gPw2Ucrv9D1FahpYdNX v/Pq+6lsYoRIRGMfHS9cp+RFs5LOFR4izsjtsBv3ctsddBwDVuUBJos2yKEW0g/I8CIy GZaSi5mU7jBOOTlw6J9itpKWr2FrElsM6Nz5PVwFamSgbcaN9/vIs24Qkol7SQq8xJPN diOupJhOcJ7Jv+3wbA3GI3OLkZI7pJhQCMsrPwzOtlw5oWxeSuXNSoq2guC86l5HRGqI /iIhvjog/gC5R0GSdyCFa8oavOc9B8gg+M1WVWD60fKpBBTm3FKaWDS+9OtiqPDbA/eo kYPg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:from:to:cc:subject:date:message-id :in-reply-to:references:mime-version:content-transfer-encoding; bh=2lZIChPtI3p/aQ6I3GH7R9vIF95h/LXfK2s4My5ecFY=; b=px4eyER33OsZkGbAma4t0aBgcOYcGJpdr5kQDPuoMjKXpkkV6EilunEVl9btfiShLZ ZHcrv5LMzUv1puN6irlhB5PB6NcnXWdzSXeN/d0QEnZfxFRAuoxpNAlZuGIQhaIgA9wI y2gD1hB17XSDCjOkQuvJmqFS7klR5sj8yUbtpYSjhmtNBBNwchSM6G1MP0fgVpaHMQEt Sj61cb984gddSu1MYmWsT08a53xkxeL7UHzH315/WQK4QtQ5ClvhnBzCji+eQ1YnUgIw ejSpy8qjip79TtmXt+Y540vFwBAUAqqxBh9+tsVsSom/ly85x9jAAw8rXs1i5v65lZBJ c4mw== X-Gm-Message-State: AOAM533wlDWWcR/cvM1v074gMC115h+jmU2ndvrIAZ+tlZqSSWOZEDMs COiF9+Kyj3fpCaDFQriVUK8= X-Google-Smtp-Source: ABdhPJyPQhcFlW2wScizcKfaE6eSRP+gjVd97qisGxEWmX7zZWVrW7WndKT1z6Wy60BgoWv6yGaykA== X-Received: by 2002:a05:6a00:3:b029:1f3:1959:2e3b with SMTP id h3-20020a056a000003b02901f319592e3bmr3444355pfk.11.1615392878842; Wed, 10 Mar 2021 08:14:38 -0800 (PST) Received: from bbox-1.mtv.corp.google.com ([2620:15c:211:201:64cb:74c7:f2c:e5e0]) by smtp.gmail.com with ESMTPSA id d1sm7121189pjc.24.2021.03.10.08.14.37 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 10 Mar 2021 08:14:38 -0800 (PST) Sender: Minchan Kim From: Minchan Kim To: Andrew Morton Cc: linux-mm , LKML , joaodias@google.com, surenb@google.com, cgoldswo@codeaurora.org, willy@infradead.org, mhocko@suse.com, david@redhat.com, vbabka@suse.cz, linux-fsdevel@vger.kernel.org, Minchan Kim Subject: [PATCH v3 3/3] mm: fs: Invalidate BH LRU during page migration Date: Wed, 10 Mar 2021 08:14:29 -0800 Message-Id: <20210310161429.399432-3-minchan@kernel.org> X-Mailer: git-send-email 2.30.1.766.gb4fecdf3b7-goog In-Reply-To: <20210310161429.399432-1-minchan@kernel.org> References: <20210310161429.399432-1-minchan@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Pages containing buffer_heads that are in one of the per-CPU buffer_head LRU caches will be pinned and thus cannot be migrated. This can prevent CMA allocations from succeeding, which are often used on platforms with co-processors (such as a DSP) that can only use physically contiguous memory. It can also prevent memory hot-unplugging from succeeding, which involves migrating at least MIN_MEMORY_BLOCK_SIZE bytes of memory, which ranges from 8 MiB to 1 GiB based on the architecture in use. Correspondingly, invalidate the BH LRU caches before a migration starts and stop any buffer_head from being cached in the LRU caches, until migration has finished. Signed-off-by: Chris Goldsworthy Signed-off-by: Minchan Kim --- fs/buffer.c | 12 ++++++++++-- include/linux/buffer_head.h | 4 ++++ mm/swap.c | 5 ++++- 3 files changed, 18 insertions(+), 3 deletions(-) diff --git a/fs/buffer.c b/fs/buffer.c index 0cb7ffd4977c..ca9dd736bcb8 100644 --- a/fs/buffer.c +++ b/fs/buffer.c @@ -1264,6 +1264,14 @@ static void bh_lru_install(struct buffer_head *bh) int i; check_irqs_on(); + /* + * buffer_head in bh_lru could increase refcount of the page + * until it will be invalidated. It causes page migraion failure. + * Skip putting upcoming bh into bh_lru until migration is done. + */ + if (lru_cache_disabled()) + return; + bh_lru_lock(); b = this_cpu_ptr(&bh_lrus); @@ -1409,7 +1417,7 @@ EXPORT_SYMBOL(__bread_gfp); * This doesn't race because it runs in each cpu either in irq * or with preempt disabled. */ -static void invalidate_bh_lru(void *arg) +void invalidate_bh_lru(void *arg) { struct bh_lru *b = &get_cpu_var(bh_lrus); int i; @@ -1421,7 +1429,7 @@ static void invalidate_bh_lru(void *arg) put_cpu_var(bh_lrus); } -static bool has_bh_in_lru(int cpu, void *dummy) +bool has_bh_in_lru(int cpu, void *dummy) { struct bh_lru *b = per_cpu_ptr(&bh_lrus, cpu); int i; diff --git a/include/linux/buffer_head.h b/include/linux/buffer_head.h index 6b47f94378c5..05998b5947a2 100644 --- a/include/linux/buffer_head.h +++ b/include/linux/buffer_head.h @@ -194,6 +194,8 @@ void __breadahead_gfp(struct block_device *, sector_t block, unsigned int size, struct buffer_head *__bread_gfp(struct block_device *, sector_t block, unsigned size, gfp_t gfp); void invalidate_bh_lrus(void); +void invalidate_bh_lru(void *arg); +bool has_bh_in_lru(int cpu, void *dummy); struct buffer_head *alloc_buffer_head(gfp_t gfp_flags); void free_buffer_head(struct buffer_head * bh); void unlock_buffer(struct buffer_head *bh); @@ -406,6 +408,8 @@ static inline int inode_has_buffers(struct inode *inode) { return 0; } static inline void invalidate_inode_buffers(struct inode *inode) {} static inline int remove_inode_buffers(struct inode *inode) { return 1; } static inline int sync_mapping_buffers(struct address_space *mapping) { return 0; } +static inline void invalidate_bh_lru(void *arg) {} +static inline bool has_bh_in_lru(int cpu, void *dummy) { return 0; } #define buffer_heads_over_limit 0 #endif /* CONFIG_BLOCK */ diff --git a/mm/swap.c b/mm/swap.c index fbdf6ac05aec..2a431959a45d 100644 --- a/mm/swap.c +++ b/mm/swap.c @@ -36,6 +36,7 @@ #include #include #include +#include #include "internal.h" @@ -641,6 +642,7 @@ void lru_add_drain_cpu(int cpu) pagevec_lru_move_fn(pvec, lru_lazyfree_fn); activate_page_drain(cpu); + invalidate_bh_lru(NULL); } /** @@ -828,7 +830,8 @@ static void __lru_add_drain_all(bool force_all_cpus) pagevec_count(&per_cpu(lru_pvecs.lru_deactivate_file, cpu)) || pagevec_count(&per_cpu(lru_pvecs.lru_deactivate, cpu)) || pagevec_count(&per_cpu(lru_pvecs.lru_lazyfree, cpu)) || - need_activate_page_drain(cpu)) { + need_activate_page_drain(cpu) || + has_bh_in_lru(cpu, NULL)) { INIT_WORK(work, lru_add_drain_per_cpu); queue_work_on(cpu, mm_percpu_wq, work); __cpumask_set_cpu(cpu, &has_work); -- 2.30.1.766.gb4fecdf3b7-goog