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 kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 61E4FC4332F for ; Tue, 22 Mar 2022 21:40:47 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id E681C6B0073; Tue, 22 Mar 2022 17:40:46 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id DA0DD6B0074; Tue, 22 Mar 2022 17:40:46 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id C8E9C6B0085; Tue, 22 Mar 2022 17:40:46 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (relay.a.hostedemail.com [64.99.140.24]) by kanga.kvack.org (Postfix) with ESMTP id BAAE56B0073 for ; Tue, 22 Mar 2022 17:40:46 -0400 (EDT) Received: from smtpin04.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay02.hostedemail.com (Postfix) with ESMTP id 8CDB423F54 for ; Tue, 22 Mar 2022 21:40:46 +0000 (UTC) X-FDA: 79273342092.04.886F4C3 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by imf12.hostedemail.com (Postfix) with ESMTP id 033514003B for ; Tue, 22 Mar 2022 21:40:45 +0000 (UTC) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 7314A610A1; Tue, 22 Mar 2022 21:40:45 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id C9F9BC340F3; Tue, 22 Mar 2022 21:40:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1647985244; bh=VlyY3pOJ3a0/P4OQp/qLVY9A3L9ShJeRgy6qKyNI2os=; h=Date:To:From:In-Reply-To:Subject:From; b=IFSEvgatPRLp/fZeIvHjI/i/tRPvQDXlPF/YI/s7PPlpFp1gM0HDhr88hfruEmXrh Jmpmq9G+Ypb9cCTEJPes+IWJZvi4ZCxw1Z6rgv6cjA9uwSAfW0XE4Pk39iqrpUmIOA ySPLoc8piepN+yKUd/Eqx6AU8qaAIJZjEFtVFYnA= Date: Tue, 22 Mar 2022 14:40:44 -0700 To: vdavydov.dev@gmail.com,tglx@linutronix.de,shakeelb@google.com,peterz@infradead.org,oliver.sang@intel.com,mkoutny@suse.com,mhocko@suse.com,mhocko@kernel.org,longman@redhat.com,guro@fb.com,bigeasy@linutronix.de,hannes@cmpxchg.org,akpm@linux-foundation.org,patches@lists.linux.dev,linux-mm@kvack.org,mm-commits@vger.kernel.org,torvalds@linux-foundation.org,akpm@linux-foundation.org From: Andrew Morton In-Reply-To: <20220322143803.04a5e59a07e48284f196a2f9@linux-foundation.org> Subject: [patch 044/227] mm/memcg: opencode the inner part of obj_cgroup_uncharge_pages() in drain_obj_stock() Message-Id: <20220322214044.C9F9BC340F3@smtp.kernel.org> X-Stat-Signature: sc6ia8hcxnqfxa8ygkqzshdtjsfjtzgy X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: 033514003B Authentication-Results: imf12.hostedemail.com; dkim=pass header.d=linux-foundation.org header.s=korg header.b=IFSEvgat; dmarc=none; spf=pass (imf12.hostedemail.com: domain of akpm@linux-foundation.org designates 139.178.84.217 as permitted sender) smtp.mailfrom=akpm@linux-foundation.org X-Rspam-User: X-HE-Tag: 1647985245-393129 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: From: Johannes Weiner Subject: mm/memcg: opencode the inner part of obj_cgroup_uncharge_pages() in drain_obj_stock() Provide the inner part of refill_stock() as __refill_stock() without disabling interrupts. This eases the integration of local_lock_t where recursive locking must be avoided. Open code obj_cgroup_uncharge_pages() in drain_obj_stock() and use __refill_stock(). The caller of drain_obj_stock() already disables interrupts. [bigeasy@linutronix.de: patch body around Johannes' diff] Link: https://lkml.kernel.org/r/20220226204144.1008339-5-bigeasy@linutronix.de Signed-off-by: Johannes Weiner Signed-off-by: Sebastian Andrzej Siewior Reviewed-by: Shakeel Butt Reviewed-by: Roman Gushchin Acked-by: Michal Hocko Cc: kernel test robot Cc: Michal Hocko Cc: Michal Koutný Cc: Peter Zijlstra Cc: Thomas Gleixner Cc: Vladimir Davydov Cc: Waiman Long Signed-off-by: Andrew Morton --- mm/memcontrol.c | 24 ++++++++++++++++++------ 1 file changed, 18 insertions(+), 6 deletions(-) --- a/mm/memcontrol.c~mm-memcg-opencode-the-inner-part-of-obj_cgroup_uncharge_pages-in-drain_obj_stock +++ a/mm/memcontrol.c @@ -2251,12 +2251,9 @@ static void drain_local_stock(struct wor * Cache charges(val) to local per_cpu area. * This will be consumed by consume_stock() function, later. */ -static void refill_stock(struct mem_cgroup *memcg, unsigned int nr_pages) +static void __refill_stock(struct mem_cgroup *memcg, unsigned int nr_pages) { struct memcg_stock_pcp *stock; - unsigned long flags; - - local_irq_save(flags); stock = this_cpu_ptr(&memcg_stock); if (stock->cached != memcg) { /* reset if necessary */ @@ -2268,7 +2265,14 @@ static void refill_stock(struct mem_cgro if (stock->nr_pages > MEMCG_CHARGE_BATCH) drain_stock(stock); +} + +static void refill_stock(struct mem_cgroup *memcg, unsigned int nr_pages) +{ + unsigned long flags; + local_irq_save(flags); + __refill_stock(memcg, nr_pages); local_irq_restore(flags); } @@ -3185,8 +3189,16 @@ static void drain_obj_stock(struct memcg unsigned int nr_pages = stock->nr_bytes >> PAGE_SHIFT; unsigned int nr_bytes = stock->nr_bytes & (PAGE_SIZE - 1); - if (nr_pages) - obj_cgroup_uncharge_pages(old, nr_pages); + if (nr_pages) { + struct mem_cgroup *memcg; + + memcg = get_mem_cgroup_from_objcg(old); + + memcg_account_kmem(memcg, -nr_pages); + __refill_stock(memcg, nr_pages); + + css_put(&memcg->css); + } /* * The leftover is flushed to the centralized per-memcg value. _