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[2003:cb:c702:4100:a064:1ded:25ec:cf2f]) by smtp.gmail.com with ESMTPSA id j20-20020a5d6e54000000b002cea8664304sm8371060wrz.91.2023.03.20.02.37.38 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 20 Mar 2023 02:37:39 -0700 (PDT) Message-ID: Date: Mon, 20 Mar 2023 10:37:38 +0100 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.8.0 Subject: Re: [RFC 00/12] module: avoid userspace pressure on unwanted allocations Content-Language: en-US To: Luis Chamberlain Cc: linux-modules@vger.kernel.org, linux-kernel@vger.kernel.org, pmladek@suse.com, petr.pavlu@suse.com, prarit@redhat.com, christophe.leroy@csgroup.eu, song@kernel.org, torvalds@linux-foundation.org References: <20230311051712.4095040-1-mcgrof@kernel.org> <3b25ed5c-8fb9-82d3-2296-fadbbb4db7e4@redhat.com> From: David Hildenbrand Organization: Red Hat In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: On 17.03.23 00:56, Luis Chamberlain wrote: > On Thu, Mar 16, 2023 at 04:55:31PM -0700, Luis Chamberlain wrote: >> On Wed, Mar 15, 2023 at 05:41:53PM +0100, David Hildenbrand wrote: >>> I expect to have a machine (with a crazy number of CPUs/devices) available >>> in a couple of days (1-2), so no need to rush. >>> >>> The original machine I was able to reproduce with is blocked for a little >>> bit longer; so I hope the alternative I looked up will similarly trigger the >>> issue easily. >> >> OK give this a spin: >> >> https://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/linux.git/log/?h=20230316-module-alloc-opts >> >> I'm seeing about ~86 MiB saving on the upper bound on memory usage >> while hammering on kmod test 0008, and this is on a small system. >> >> Probably won't help *that* much but am curious... if it helps somewhat. > > How much cpu count BTW? 220 physical ones and 440 virtual ones. -- Thanks, David / dhildenb