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 Received: from lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id CAB23C001DC for ; Wed, 26 Jul 2023 07:11:05 +0000 (UTC) Authentication-Results: lists.ozlabs.org; dkim=fail reason="signature verification failed" (1024-bit key; unprotected) header.d=linux.dev header.i=@linux.dev header.a=rsa-sha256 header.s=key1 header.b=MJNzwcgK; dkim-atps=neutral Received: from boromir.ozlabs.org (localhost [IPv6:::1]) by lists.ozlabs.org (Postfix) with ESMTP id 4R9lRr3TjFz3c18 for ; Wed, 26 Jul 2023 17:11:04 +1000 (AEST) Authentication-Results: lists.ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=linux.dev header.i=@linux.dev header.a=rsa-sha256 header.s=key1 header.b=MJNzwcgK; dkim-atps=neutral Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=linux.dev (client-ip=91.218.175.40; helo=out-40.mta0.migadu.com; envelope-from=muchun.song@linux.dev; receiver=lists.ozlabs.org) Received: from out-40.mta0.migadu.com (out-40.mta0.migadu.com [91.218.175.40]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4R9lRf5jcsz2yVb for ; Wed, 26 Jul 2023 17:10:52 +1000 (AEST) Message-ID: DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1690355449; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=Jvc7jyiFGsEgqDLQ8SvDwKCvjECMcl21zak/YPsttTU=; b=MJNzwcgKcI8WMs1vcHIk9odpFzXJXYJZkCEqMlLlvbf0FvKHK96bLJs5XTXQyUPcTsHXLS nIqAIZhilsKlD4q7ONNAKGG+YEnzT1SMJk3OhEOossreA6CsEZNAbhHhb/1A0W8D/Gm3Q3 yKiIjz335Q++bI56PmpRINRM4YbGaI0= Date: Wed, 26 Jul 2023 15:10:21 +0800 MIME-Version: 1.0 Subject: Re: [PATCH v2 19/47] mm: thp: dynamically allocate the thp-related shrinkers To: Qi Zheng References: <20230724094354.90817-1-zhengqi.arch@bytedance.com> <20230724094354.90817-20-zhengqi.arch@bytedance.com> X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. From: Muchun Song In-Reply-To: <20230724094354.90817-20-zhengqi.arch@bytedance.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Migadu-Flow: FLOW_OUT X-BeenThere: linux-erofs@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Development of Linux EROFS file system List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: kvm@vger.kernel.org, djwong@kernel.org, roman.gushchin@linux.dev, david@fromorbit.com, dri-devel@lists.freedesktop.org, virtualization@lists.linux-foundation.org, linux-mm@kvack.org, dm-devel@redhat.com, linux-mtd@lists.infradead.org, cel@kernel.org, x86@kernel.org, steven.price@arm.com, cluster-devel@redhat.com, xen-devel@lists.xenproject.org, linux-ext4@vger.kernel.org, paulmck@kernel.org, linux-arm-msm@vger.kernel.org, brauner@kernel.org, rcu@vger.kernel.org, linux-bcache@vger.kernel.org, yujie.liu@intel.com, vbabka@suse.cz, linux-raid@vger.kernel.org, linux-nfs@vger.kernel.org, tytso@mit.edu, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net, linux-xfs@vger.kernel.org, senozhatsky@chromium.org, gregkh@linuxfoundation.org, linux-fsdevel@vger.kernel.org, akpm@linux-foundation.org, linux-erofs@lists.ozlabs.org, linux-btrfs@vger.kernel.org, tkhai@ya.ru Errors-To: linux-erofs-bounces+linux-erofs=archiver.kernel.org@lists.ozlabs.org Sender: "Linux-erofs" On 2023/7/24 17:43, Qi Zheng wrote: > Use new APIs to dynamically allocate the thp-zero and thp-deferred_split > shrinkers. > > Signed-off-by: Qi Zheng > --- > mm/huge_memory.c | 69 +++++++++++++++++++++++++++++++----------------- > 1 file changed, 45 insertions(+), 24 deletions(-) > > diff --git a/mm/huge_memory.c b/mm/huge_memory.c > index 8c94b34024a2..4db5a1834d81 100644 > --- a/mm/huge_memory.c > +++ b/mm/huge_memory.c > @@ -65,7 +65,11 @@ unsigned long transparent_hugepage_flags __read_mostly = > (1< (1< > -static struct shrinker deferred_split_shrinker; > +static struct shrinker *deferred_split_shrinker; > +static unsigned long deferred_split_count(struct shrinker *shrink, > + struct shrink_control *sc); > +static unsigned long deferred_split_scan(struct shrinker *shrink, > + struct shrink_control *sc); > > static atomic_t huge_zero_refcount; > struct page *huge_zero_page __read_mostly; > @@ -229,11 +233,7 @@ static unsigned long shrink_huge_zero_page_scan(struct shrinker *shrink, > return 0; > } > > -static struct shrinker huge_zero_page_shrinker = { > - .count_objects = shrink_huge_zero_page_count, > - .scan_objects = shrink_huge_zero_page_scan, > - .seeks = DEFAULT_SEEKS, > -}; > +static struct shrinker *huge_zero_page_shrinker; Same as patch #17. > > #ifdef CONFIG_SYSFS > static ssize_t enabled_show(struct kobject *kobj, > @@ -454,6 +454,40 @@ static inline void hugepage_exit_sysfs(struct kobject *hugepage_kobj) > } > #endif /* CONFIG_SYSFS */ > > +static int thp_shrinker_init(void) Better to declare it as __init. > +{ > + huge_zero_page_shrinker = shrinker_alloc(0, "thp-zero"); > + if (!huge_zero_page_shrinker) > + return -ENOMEM; > + > + deferred_split_shrinker = shrinker_alloc(SHRINKER_NUMA_AWARE | > + SHRINKER_MEMCG_AWARE | > + SHRINKER_NONSLAB, > + "thp-deferred_split"); > + if (!deferred_split_shrinker) { > + shrinker_free_non_registered(huge_zero_page_shrinker); > + return -ENOMEM; > + } > + > + huge_zero_page_shrinker->count_objects = shrink_huge_zero_page_count; > + huge_zero_page_shrinker->scan_objects = shrink_huge_zero_page_scan; > + huge_zero_page_shrinker->seeks = DEFAULT_SEEKS; > + shrinker_register(huge_zero_page_shrinker); > + > + deferred_split_shrinker->count_objects = deferred_split_count; > + deferred_split_shrinker->scan_objects = deferred_split_scan; > + deferred_split_shrinker->seeks = DEFAULT_SEEKS; > + shrinker_register(deferred_split_shrinker); > + > + return 0; > +} > + > +static void thp_shrinker_exit(void) Same as here. > +{ > + shrinker_unregister(huge_zero_page_shrinker); > + shrinker_unregister(deferred_split_shrinker); > +} > + > static int __init hugepage_init(void) > { > int err; > @@ -482,12 +516,9 @@ static int __init hugepage_init(void) > if (err) > goto err_slab; > > - err = register_shrinker(&huge_zero_page_shrinker, "thp-zero"); > - if (err) > - goto err_hzp_shrinker; > - err = register_shrinker(&deferred_split_shrinker, "thp-deferred_split"); > + err = thp_shrinker_init(); > if (err) > - goto err_split_shrinker; > + goto err_shrinker; > > /* > * By default disable transparent hugepages on smaller systems, > @@ -505,10 +536,8 @@ static int __init hugepage_init(void) > > return 0; > err_khugepaged: > - unregister_shrinker(&deferred_split_shrinker); > -err_split_shrinker: > - unregister_shrinker(&huge_zero_page_shrinker); > -err_hzp_shrinker: > + thp_shrinker_exit(); > +err_shrinker: > khugepaged_destroy(); > err_slab: > hugepage_exit_sysfs(hugepage_kobj); > @@ -2851,7 +2880,7 @@ void deferred_split_folio(struct folio *folio) > #ifdef CONFIG_MEMCG > if (memcg) > set_shrinker_bit(memcg, folio_nid(folio), > - deferred_split_shrinker.id); > + deferred_split_shrinker->id); > #endif > } > spin_unlock_irqrestore(&ds_queue->split_queue_lock, flags); > @@ -2925,14 +2954,6 @@ static unsigned long deferred_split_scan(struct shrinker *shrink, > return split; > } > > -static struct shrinker deferred_split_shrinker = { > - .count_objects = deferred_split_count, > - .scan_objects = deferred_split_scan, > - .seeks = DEFAULT_SEEKS, > - .flags = SHRINKER_NUMA_AWARE | SHRINKER_MEMCG_AWARE | > - SHRINKER_NONSLAB, > -}; > - > #ifdef CONFIG_DEBUG_FS > static void split_huge_pages_all(void) > {