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[209.85.220.65]) by mx.google.com with SMTPS id a14sor43199744wrp.9.2019.07.26.21.36.33 for (Google Transport Security); Fri, 26 Jul 2019 21:36:33 -0700 (PDT) Received-SPF: pass (google.com: domain of natechancellor@gmail.com designates 209.85.220.65 as permitted sender) client-ip=209.85.220.65; Authentication-Results: mx.google.com; dkim=pass header.i=@gmail.com header.s=20161025 header.b=rCdaI5ow; spf=pass (google.com: domain of natechancellor@gmail.com designates 209.85.220.65 as permitted sender) smtp.mailfrom=natechancellor@gmail.com; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to:user-agent; bh=fgu+GGVg1EZygpoH3s9DclHYrB/yjZrN74J1ygtmHDM=; b=rCdaI5ow4Gypn3RIkjHZYS/h7C40k7HDxGmk4PNXBdQyErnWDTj5cewNyXnH9m9Ibc KWgiqyGFfnJyAJxcfuXfIGHiSY4GAexpXh+1OhSaIo227T1Iu7jqhJRpueo4l3EfKiXX SoDKLDixvK8YmE9NPbZiTmSWtQvBcuc5m5pxS6/JCxZo5dP8SHEbyHjxlsiHnAbbeSCq DbjXiK7OAS2UkXQVMBvKp+5HZpL6ObcsyxE+0js4AzVPtRbP6meDeazRmXiuyRJEEIcB 5ZQMwgtb0aFPAWSTUxMcMXHOC8RuOYyRhkNoblpDTMiEEbg//yDXpffEZQkU/SJ0BgI0 lJeg== X-Google-Smtp-Source: APXvYqzccEi33UZ//inmdDXND5H+3IHNcEku4M74cRWUS5+7SqqAECOVxFTsB3ZmO3bcUki1fk+CJg== X-Received: by 2002:adf:de8e:: with SMTP id w14mr3818862wrl.79.1564202193019; Fri, 26 Jul 2019 21:36:33 -0700 (PDT) Received: from archlinux-threadripper ([2a01:4f8:222:2f1b::2]) by smtp.gmail.com with ESMTPSA id j33sm110096204wre.42.2019.07.26.21.36.32 (version=TLS1_3 cipher=AEAD-AES256-GCM-SHA384 bits=256/256); Fri, 26 Jul 2019 21:36:32 -0700 (PDT) Date: Fri, 26 Jul 2019 21:36:31 -0700 From: Nathan Chancellor To: Andrew Morton Cc: Randy Dunlap , broonie@kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-next@vger.kernel.org, mhocko@suse.cz, mm-commits@vger.kernel.org, sfr@canb.auug.org.au, Chris Down Subject: Re: mmotm 2019-07-24-21-39 uploaded (mm/memcontrol) Message-ID: <20190727043631.GA125522@archlinux-threadripper> References: <20190725044010.4tE0dhrji%akpm@linux-foundation.org> <4831a203-8853-27d7-1996-280d34ea824f@infradead.org> <20190725163959.3d759a7f37ba40bb7f75244e@linux-foundation.org> <20190727034205.GA10843@archlinux-threadripper> <20190726211952.757a63db5271d516faa7eaac@linux-foundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190726211952.757a63db5271d516faa7eaac@linux-foundation.org> User-Agent: Mutt/1.12.1 (2019-06-15) 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: On Fri, Jul 26, 2019 at 09:19:52PM -0700, Andrew Morton wrote: > On Fri, 26 Jul 2019 20:42:05 -0700 Nathan Chancellor wrote: > > > > @@ -2414,8 +2414,9 @@ void mem_cgroup_handle_over_high(void) > > > */ > > > clamped_high = max(high, 1UL); > > > > > > - overage = ((u64)(usage - high) << MEMCG_DELAY_PRECISION_SHIFT) > > > - / clamped_high; > > > + overage = (u64)(usage - high) << MEMCG_DELAY_PRECISION_SHIFT; > > > + do_div(overage, clamped_high); > > > + > > > penalty_jiffies = ((u64)overage * overage * HZ) > > > >> (MEMCG_DELAY_PRECISION_SHIFT + MEMCG_DELAY_SCALING_SHIFT); > > > > > > _ > > > > > > > This causes a build error on arm: > > > > Ah. > > It's rather unclear why that u64 cast is there anyway. We're dealing > with ulongs all over this code. The below will suffice. I was thinking the same thing. > Chris, please take a look? > > --- a/mm/memcontrol.c~mm-throttle-allocators-when-failing-reclaim-over-memoryhigh-fix-fix-fix > +++ a/mm/memcontrol.c > @@ -2415,7 +2415,7 @@ void mem_cgroup_handle_over_high(void) > clamped_high = max(high, 1UL); > > overage = (u64)(usage - high) << MEMCG_DELAY_PRECISION_SHIFT; > - do_div(overage, clamped_high); > + overage /= clamped_high; > > penalty_jiffies = ((u64)overage * overage * HZ) > >> (MEMCG_DELAY_PRECISION_SHIFT + MEMCG_DELAY_SCALING_SHIFT); > _ > I assume this will get folded in with the original patch but for completeness (multi_v7_defconfig + CONFIG_MEMCG): Tested-by: Nathan Chancellor Thanks for the quick fix!