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[91.12.99.128]) by smtp.gmail.com with ESMTPSA id j40sm5638552wms.16.2021.11.24.05.29.38 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 24 Nov 2021 05:29:39 -0800 (PST) Message-ID: Date: Wed, 24 Nov 2021 14:29:38 +0100 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.2.0 Subject: Re: [PATCH] Increase default MLOCK_LIMIT to 8 MiB Content-Language: en-US To: Jason Gunthorpe Cc: Vlastimil Babka , Jens Axboe , Andrew Dona-Couch , Andrew Morton , Drew DeVault , Ammar Faizi , linux-kernel@vger.kernel.org, linux-api@vger.kernel.org, io_uring Mailing List , Pavel Begunkov , linux-mm@kvack.org References: <20211123132523.GA5112@ziepe.ca> <10ccf01b-f13a-d626-beba-cbee70770cf1@redhat.com> <20211123140709.GB5112@ziepe.ca> <20211123170056.GC5112@ziepe.ca> <20211123235953.GF5112@ziepe.ca> <2adca04f-92e1-5f99-6094-5fac66a22a77@redhat.com> <20211124132353.GG5112@ziepe.ca> <20211124132842.GH5112@ziepe.ca> From: David Hildenbrand Organization: Red Hat In-Reply-To: <20211124132842.GH5112@ziepe.ca> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-api@vger.kernel.org On 24.11.21 14:28, Jason Gunthorpe wrote: > On Wed, Nov 24, 2021 at 02:25:09PM +0100, David Hildenbrand wrote: >> On 24.11.21 14:23, Jason Gunthorpe wrote: >>> On Wed, Nov 24, 2021 at 09:57:32AM +0100, David Hildenbrand wrote: >>> >>>> Unfortunately it will only be a band aid AFAIU. I can rewrite my >>>> reproducer fairly easily to pin the whole 2M range first, pin a second >>>> time only a single page, and then unpin the 2M range, resulting in the >>>> very same way to block THP. (I can block some THP less because I always >>>> need the possibility to memlock 2M first, though). >>> >>> Oh! >>> >>> The issue is GUP always pins an entire compound, no matter how little >>> the user requests. >> >> That's a different issue. I make sure to split the compound page before >> pinning anything :) > > ?? Where is that done in GUP? It's done in my reproducer manually. -- Thanks, David / dhildenb