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a="188430518" X-IronPort-AV: E=Sophos;i="5.81,236,1610438400"; d="scan'208";a="188430518" Received: from orsmga001.jf.intel.com ([10.7.209.18]) by orsmga102.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 09 Mar 2021 13:53:14 -0800 IronPort-SDR: 5QP3bP898qdsOxObYFIXYrySeDVWGeF6d+dMI3ZX7/uXQQL1l9NOy28BEcD4T5LTCbVsNTwNmh f5KKZe4KTs4w== X-IronPort-AV: E=Sophos;i="5.81,236,1610438400"; d="scan'208";a="447658459" Received: from jcchan4-mobl.amr.corp.intel.com (HELO [10.212.217.30]) ([10.212.217.30]) by orsmga001-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 09 Mar 2021 13:53:13 -0800 Subject: Re: [PATCH 10/10] mm/migrate: new zone_reclaim_mode to enable reclaim migration To: Yang Shi , Dave Hansen Cc: Linux Kernel Mailing List , Linux MM , Yang Shi , David Rientjes , Huang Ying , Dan Williams , David Hildenbrand , Oscar Salvador References: <20210304235949.7922C1C3@viggo.jf.intel.com> <20210305000009.EDF902E9@viggo.jf.intel.com> From: Dave Hansen Autocrypt: addr=dave.hansen@intel.com; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 3/8/21 4:24 PM, Yang Shi wrote: >> Once this is enabled page demotion may move data to a NUMA node >> that does not fall into the cpuset of the allocating process. >> This could be construed to violate the guarantees of cpusets. >> However, since this is an opt-in mechanism, the assumption is >> that anyone enabling it is content to relax the guarantees. > I think we'd better have the cpuset violation paragraph along with new > zone reclaim mode text so that the users are aware of the potential > violation. I don't think commit log is the to-go place for any plain > users. > Agreed. I'll add it to the Documentation/.