From patchwork Mon Apr 12 22:55:03 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Waiman Long X-Patchwork-Id: 12199017 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=-15.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 8E662C43470 for ; Mon, 12 Apr 2021 22:55:41 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 2B42361249 for ; Mon, 12 Apr 2021 22:55:41 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 2B42361249 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id C20616B0073; Mon, 12 Apr 2021 18:55:40 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id BF7746B0074; Mon, 12 Apr 2021 18:55:40 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id A99476B0075; Mon, 12 Apr 2021 18:55:40 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0076.hostedemail.com [216.40.44.76]) by kanga.kvack.org (Postfix) with ESMTP id 8DC126B0073 for ; Mon, 12 Apr 2021 18:55:40 -0400 (EDT) Received: from smtpin07.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with ESMTP id 4C9AB8248D51 for ; Mon, 12 Apr 2021 22:55:40 +0000 (UTC) X-FDA: 78025223640.07.FEF52CD Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by imf09.hostedemail.com (Postfix) with ESMTP id F31876000109 for ; Mon, 12 Apr 2021 22:55:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1618268139; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:in-reply-to:in-reply-to:references:references; bh=x9sOHgVsi/JZH5ao8kUPYU6FS5v/REIN9a6IWHWDaPc=; b=EVqu1LHd2N6pfFbZBzfsvnv4EeBxphkoSt0qAv4ZiFk9q4nS4I5TuV5tL0JSQ1POSjBuwu 01sy7j7sMaSBMvIgfL14WtZt3Rr9n7jZIbl1MVJCTc0f/bDdwdhpeXF+H0cFdStyaGNVDk +jgPAVfWSIVo2n2pHFdnqQ1ce5uxgoc= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-468-m1nKxJdYMfuZaHkW4x29oQ-1; Mon, 12 Apr 2021 18:55:35 -0400 X-MC-Unique: m1nKxJdYMfuZaHkW4x29oQ-1 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.15]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 2BABA801814; Mon, 12 Apr 2021 22:55:33 +0000 (UTC) Received: from llong.com (ovpn-114-18.rdu2.redhat.com [10.10.114.18]) by smtp.corp.redhat.com (Postfix) with ESMTP id EBF1E5D6D1; Mon, 12 Apr 2021 22:55:30 +0000 (UTC) From: Waiman Long To: Johannes Weiner , Michal Hocko , Vladimir Davydov , Andrew Morton , Tejun Heo , Christoph Lameter , Pekka Enberg , David Rientjes , Joonsoo Kim , Vlastimil Babka , Roman Gushchin Cc: linux-kernel@vger.kernel.org, cgroups@vger.kernel.org, linux-mm@kvack.org, Shakeel Butt , Muchun Song , Alex Shi , Chris Down , Yafang Shao , Wei Yang , Masayoshi Mizuma , Xing Zhengjun , Waiman Long Subject: [PATCH v2 5/5] mm/memcg: Optimize user context object stock access Date: Mon, 12 Apr 2021 18:55:03 -0400 Message-Id: <20210412225503.15119-6-longman@redhat.com> In-Reply-To: <20210412225503.15119-1-longman@redhat.com> References: <20210412225503.15119-1-longman@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: F31876000109 X-Stat-Signature: ai35ohwkgegzxoejbzjtcya561te3eks Received-SPF: none (redhat.com>: No applicable sender policy available) receiver=imf09; identity=mailfrom; envelope-from=""; helo=us-smtp-delivery-124.mimecast.com; client-ip=170.10.133.124 X-HE-DKIM-Result: pass/pass X-HE-Tag: 1618268136-95080 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: Most kmem_cache_alloc() calls are from user context. With instrumentation enabled, the measured amount of kmem_cache_alloc() calls from non-task context was about 0.01% of the total. The irq disable/enable sequence used in this case to access content from object stock is slow. To optimize for user context access, there are now two object stocks for task context and interrupt context access respectively. The task context object stock can be accessed after disabling preemption which is cheap in non-preempt kernel. The interrupt context object stock can only be accessed after disabling interrupt. User context code can access interrupt object stock, but not vice versa. The mod_objcg_state() function is also modified to make sure that memcg and lruvec stat updates are done with interrupted disabled. The downside of this change is that there are more data stored in local object stocks and not reflected in the charge counter and the vmstat arrays. However, this is a small price to pay for better performance. Signed-off-by: Waiman Long Acked-by: Roman Gushchin Reviewed-by: Shakeel Butt --- mm/memcontrol.c | 73 +++++++++++++++++++++++++++++++++++++++---------- 1 file changed, 59 insertions(+), 14 deletions(-) diff --git a/mm/memcontrol.c b/mm/memcontrol.c index 69f728383efe..29f2df76644a 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -2229,7 +2229,8 @@ struct obj_stock { struct memcg_stock_pcp { struct mem_cgroup *cached; /* this never be root cgroup */ unsigned int nr_pages; - struct obj_stock obj; + struct obj_stock task_obj; + struct obj_stock irq_obj; struct work_struct work; unsigned long flags; @@ -2254,11 +2255,48 @@ static bool obj_stock_flush_required(struct memcg_stock_pcp *stock, } #endif +/* + * Most kmem_cache_alloc() calls are from user context. The irq disable/enable + * sequence used in this case to access content from object stock is slow. + * To optimize for user context access, there are now two object stocks for + * task context and interrupt context access respectively. + * + * The task context object stock can be accessed by disabling preemption only + * which is cheap in non-preempt kernel. The interrupt context object stock + * can only be accessed after disabling interrupt. User context code can + * access interrupt object stock, but not vice versa. + */ static inline struct obj_stock *current_obj_stock(void) { struct memcg_stock_pcp *stock = this_cpu_ptr(&memcg_stock); - return &stock->obj; + return in_task() ? &stock->task_obj : &stock->irq_obj; +} + +#define get_obj_stock(flags) \ +({ \ + struct memcg_stock_pcp *stock; \ + struct obj_stock *obj_stock; \ + \ + if (in_task()) { \ + preempt_disable(); \ + (flags) = -1L; \ + stock = this_cpu_ptr(&memcg_stock); \ + obj_stock = &stock->task_obj; \ + } else { \ + local_irq_save(flags); \ + stock = this_cpu_ptr(&memcg_stock); \ + obj_stock = &stock->irq_obj; \ + } \ + obj_stock; \ +}) + +static inline void put_obj_stock(unsigned long flags) +{ + if (flags == -1L) + preempt_enable(); + else + local_irq_restore(flags); } /** @@ -2327,7 +2365,9 @@ static void drain_local_stock(struct work_struct *dummy) local_irq_save(flags); stock = this_cpu_ptr(&memcg_stock); - drain_obj_stock(&stock->obj); + drain_obj_stock(&stock->irq_obj); + if (in_task()) + drain_obj_stock(&stock->task_obj); drain_stock(stock); clear_bit(FLUSHING_CACHED_CHARGE, &stock->flags); @@ -3183,7 +3223,7 @@ static inline void mod_objcg_state(struct obj_cgroup *objcg, memcg = obj_cgroup_memcg(objcg); if (pgdat) lruvec = mem_cgroup_lruvec(memcg, pgdat); - __mod_memcg_lruvec_state(memcg, lruvec, idx, nr); + mod_memcg_lruvec_state(memcg, lruvec, idx, nr); rcu_read_unlock(); } @@ -3193,7 +3233,7 @@ static bool consume_obj_stock(struct obj_cgroup *objcg, unsigned int nr_bytes) unsigned long flags; bool ret = false; - local_irq_save(flags); + stock = get_obj_stock(flags); stock = current_obj_stock(); if (objcg == stock->cached_objcg && stock->nr_bytes >= nr_bytes) { @@ -3201,7 +3241,7 @@ static bool consume_obj_stock(struct obj_cgroup *objcg, unsigned int nr_bytes) ret = true; } - local_irq_restore(flags); + put_obj_stock(flags); return ret; } @@ -3254,8 +3294,13 @@ static bool obj_stock_flush_required(struct memcg_stock_pcp *stock, { struct mem_cgroup *memcg; - if (stock->obj.cached_objcg) { - memcg = obj_cgroup_memcg(stock->obj.cached_objcg); + if (in_task() && stock->task_obj.cached_objcg) { + memcg = obj_cgroup_memcg(stock->task_obj.cached_objcg); + if (memcg && mem_cgroup_is_descendant(memcg, root_memcg)) + return true; + } + if (stock->irq_obj.cached_objcg) { + memcg = obj_cgroup_memcg(stock->irq_obj.cached_objcg); if (memcg && mem_cgroup_is_descendant(memcg, root_memcg)) return true; } @@ -3283,9 +3328,9 @@ static void refill_obj_stock(struct obj_cgroup *objcg, unsigned int nr_bytes) { unsigned long flags; - local_irq_save(flags); + get_obj_stock(flags); __refill_obj_stock(objcg, nr_bytes); - local_irq_restore(flags); + put_obj_stock(flags); } static void __mod_obj_stock_state(struct obj_cgroup *objcg, @@ -3325,9 +3370,9 @@ void mod_obj_stock_state(struct obj_cgroup *objcg, struct pglist_data *pgdat, { unsigned long flags; - local_irq_save(flags); + get_obj_stock(flags); __mod_obj_stock_state(objcg, pgdat, idx, nr); - local_irq_restore(flags); + put_obj_stock(flags); } int obj_cgroup_charge(struct obj_cgroup *objcg, gfp_t gfp, size_t size) @@ -3380,10 +3425,10 @@ void obj_cgroup_uncharge_mod_state(struct obj_cgroup *objcg, size_t size, { unsigned long flags; - local_irq_save(flags); + get_obj_stock(flags); __refill_obj_stock(objcg, size); __mod_obj_stock_state(objcg, pgdat, idx, -(int)size); - local_irq_restore(flags); + put_obj_stock(flags); } #endif /* CONFIG_MEMCG_KMEM */