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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 77787ECAAD8 for ; Thu, 1 Sep 2022 06:52:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232728AbiIAGwj (ORCPT ); Thu, 1 Sep 2022 02:52:39 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36690 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233401AbiIAGwg (ORCPT ); Thu, 1 Sep 2022 02:52:36 -0400 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 459C616216C; Wed, 31 Aug 2022 23:52:34 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=qvwvxWbXfnEQ3IUNjSPCWfkqNnnfffGD2A+a/tILXCw=; b=eDO+GXurFPPTEhSILm/ZJtBNxQ B/9JFPYXpVAQVWUcHDCKnIJB1CdMNaXyZHSoxVVCmiz4jck+Zph/Hso4OWj1yo59UkEI+TuSjs/0x 4BG2flE2PwSfLX89dYyD5r9GR/8VhGNI0N1wP4bgU/qL1SOlI1eG/E3m2lqxC2LJi2W5e2ZJJ7zFM 9WEyIPPuONeD1Tk8Yc6NZe7o+Iy919N/s3xHO7Z59aKE7A91A4yWodHn2+/k4lX6bmEaKbqBQMFS3 J++P7dbtRWHNfytn2lcsT7UoR+667IJI0PRpmXC+glH+3s6vtPuXP6y5P4CsaHrdycBcwdGm7XaxS LoVTq62g==; Received: from j130084.upc-j.chello.nl ([24.132.130.84] helo=noisy.programming.kicks-ass.net) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1oTe36-005oCV-6V; Thu, 01 Sep 2022 06:51:36 +0000 Received: from hirez.programming.kicks-ass.net (hirez.programming.kicks-ass.net [192.168.1.225]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (Client did not present a certificate) by noisy.programming.kicks-ass.net (Postfix) with ESMTPS id EFD5E300431; Thu, 1 Sep 2022 08:51:31 +0200 (CEST) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id CFCAB20981381; Thu, 1 Sep 2022 08:51:31 +0200 (CEST) Date: Thu, 1 Sep 2022 08:51:31 +0200 From: Peter Zijlstra To: Suren Baghdasaryan Cc: akpm@linux-foundation.org, kent.overstreet@linux.dev, mhocko@suse.com, vbabka@suse.cz, hannes@cmpxchg.org, roman.gushchin@linux.dev, mgorman@suse.de, dave@stgolabs.net, willy@infradead.org, liam.howlett@oracle.com, void@manifault.com, juri.lelli@redhat.com, ldufour@linux.ibm.com, peterx@redhat.com, david@redhat.com, axboe@kernel.dk, mcgrof@kernel.org, masahiroy@kernel.org, nathan@kernel.org, changbin.du@intel.com, ytcoode@gmail.com, vincent.guittot@linaro.org, dietmar.eggemann@arm.com, rostedt@goodmis.org, bsegall@google.com, bristot@redhat.com, vschneid@redhat.com, cl@linux.com, penberg@kernel.org, iamjoonsoo.kim@lge.com, 42.hyeyoo@gmail.com, glider@google.com, elver@google.com, dvyukov@google.com, shakeelb@google.com, songmuchun@bytedance.com, arnd@arndb.de, jbaron@akamai.com, rientjes@google.com, minchan@google.com, kaleshsingh@google.com, kernel-team@android.com, linux-mm@kvack.org, iommu@lists.linux.dev, kasan-dev@googlegroups.com, io-uring@vger.kernel.org, linux-arch@vger.kernel.org, xen-devel@lists.xenproject.org, linux-bcache@vger.kernel.org, linux-modules@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [RFC PATCH 03/30] Lazy percpu counters Message-ID: References: <20220830214919.53220-1-surenb@google.com> <20220830214919.53220-4-surenb@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20220830214919.53220-4-surenb@google.com> Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org On Tue, Aug 30, 2022 at 02:48:52PM -0700, Suren Baghdasaryan wrote: > +static void lazy_percpu_counter_switch_to_pcpu(struct raw_lazy_percpu_counter *c) > +{ > + u64 __percpu *pcpu_v = alloc_percpu_gfp(u64, GFP_ATOMIC|__GFP_NOWARN); Realize that this is incorrect when used under a raw_spinlock_t.