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From: David Hildenbrand <david@redhat.com>
To: Jason Gunthorpe <jgg@ziepe.ca>
Cc: Vlastimil Babka <vbabka@suse.cz>, Jens Axboe <axboe@kernel.dk>,
	Andrew Dona-Couch <andrew@donacou.ch>,
	Andrew Morton <akpm@linux-foundation.org>,
	Drew DeVault <sir@cmpwn.com>,
	Ammar Faizi <ammarfaizi2@gnuweeb.org>,
	linux-kernel@vger.kernel.org, linux-api@vger.kernel.org,
	io_uring Mailing List <io-uring@vger.kernel.org>,
	Pavel Begunkov <asml.silence@gmail.com>,
	linux-mm@kvack.org
Subject: Re: [PATCH] Increase default MLOCK_LIMIT to 8 MiB
Date: Wed, 24 Nov 2021 14:25:09 +0100	[thread overview]
Message-ID: <cca0229e-e53e-bceb-e215-327b6401f256@redhat.com> (raw)
In-Reply-To: <20211124132353.GG5112@ziepe.ca>

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 :)

-- 
Thanks,

David / dhildenb


  reply	other threads:[~2021-11-24 13:29 UTC|newest]

Thread overview: 58+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-10-28  8:08 [PATCH] Increase default MLOCK_LIMIT to 8 MiB Drew DeVault
2021-10-28 18:22 ` Jens Axboe
2021-11-04 14:27   ` Cyril Hrubis
2021-11-04 14:44     ` Jens Axboe
2021-11-06  2:33 ` Ammar Faizi
2021-11-06  7:05   ` Drew DeVault
2021-11-06  7:12     ` Ammar Faizi
2021-11-16  4:35       ` Andrew Morton
2021-11-16  6:32         ` Drew DeVault
2021-11-16 19:47           ` Andrew Morton
2021-11-16 19:48             ` Drew DeVault
2021-11-16 21:37               ` Andrew Morton
2021-11-17  8:23                 ` Drew DeVault
2021-11-22 17:11                 ` David Hildenbrand
2021-11-22 17:55                   ` Andrew Dona-Couch
2021-11-22 18:26                     ` David Hildenbrand
2021-11-22 19:53                       ` Jens Axboe
2021-11-22 20:03                         ` Matthew Wilcox
2021-11-22 20:04                           ` Jens Axboe
2021-11-22 20:08                         ` David Hildenbrand
2021-11-22 20:44                           ` Jens Axboe
2021-11-22 21:56                             ` David Hildenbrand
2021-11-23 12:02                               ` David Hildenbrand
2021-11-23 13:25                           ` Jason Gunthorpe
2021-11-23 13:39                             ` David Hildenbrand
2021-11-23 14:07                               ` Jason Gunthorpe
2021-11-23 14:44                                 ` David Hildenbrand
2021-11-23 17:00                                   ` Jason Gunthorpe
2021-11-23 17:04                                     ` David Hildenbrand
2021-11-23 22:04                                     ` Vlastimil Babka
2021-11-23 23:59                                       ` Jason Gunthorpe
2021-11-24  8:57                                         ` David Hildenbrand
2021-11-24 13:23                                           ` Jason Gunthorpe
2021-11-24 13:25                                             ` David Hildenbrand [this message]
2021-11-24 13:28                                               ` Jason Gunthorpe
2021-11-24 13:29                                                 ` David Hildenbrand
2021-11-24 13:48                                                   ` Jason Gunthorpe
2021-11-24 14:14                                                     ` David Hildenbrand
2021-11-24 15:34                                                       ` Jason Gunthorpe
2021-11-24 16:43                                                         ` David Hildenbrand
2021-11-24 18:35                                                           ` Jason Gunthorpe
2021-11-24 19:09                                                             ` David Hildenbrand
2021-11-24 23:11                                                               ` Jason Gunthorpe
2021-11-30 15:52                                                                 ` David Hildenbrand
2021-11-24 18:37                                                           ` David Hildenbrand
2021-11-24 14:37                                           ` Vlastimil Babka
2021-11-24 14:41                                             ` David Hildenbrand
2021-11-16 18:36         ` Matthew Wilcox
2021-11-16 18:44           ` Drew DeVault
2021-11-16 18:55           ` Jens Axboe
2021-11-16 19:21             ` Vito Caputo
2021-11-16 19:25               ` Drew DeVault
2021-11-16 19:46                 ` Vito Caputo
2021-11-16 19:41               ` Jens Axboe
2021-11-17 22:26         ` Johannes Weiner
2021-11-17 23:17           ` Jens Axboe
2021-11-18 21:58             ` Andrew Morton
2021-11-19  7:41               ` Drew DeVault

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