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From: Dominique Martinet <asmadeus@codewreck.org>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Dave Chinner <david@fromorbit.com>,
	Jiri Kosina <jikos@kernel.org>,
	Matthew Wilcox <willy@infradead.org>,
	Jann Horn <jannh@google.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Greg KH <gregkh@linuxfoundation.org>,
	Peter Zijlstra <peterz@infradead.org>,
	Michal Hocko <mhocko@suse.com>, Linux-MM <linux-mm@kvack.org>,
	kernel list <linux-kernel@vger.kernel.org>,
	Linux API <linux-api@vger.kernel.org>
Subject: Re: [PATCH] mm/mincore: allow for making sys_mincore() privileged
Date: Thu, 10 Jan 2019 13:24:42 +0100	[thread overview]
Message-ID: <20190110122442.GA21216@nautica> (raw)
In-Reply-To: <CAHk-=wigwXV_G-V1VxLs6BAvVkvW5=Oj+xrNHxE_7yxEVwoe3w@mail.gmail.com>

Linus Torvalds wrote on Thu, Jan 10, 2019:
> (Except, of course, if somebody actually notices outside of tests.
> Which may well happen and just force us to revert that commit. But
> that's a separate issue entirely).

Both Dave and I pointed at a couple of utilities that break with
this. nocache can arguably work with the new behaviour but will behave
differently; vmtouch on the other hand is no longer able to display
what's in cache or not - people use that for example to "warm up" a
container in page cache based on how it appears after it had been
running for a while is a pretty valid usecase to me.

>From the list Kevin harvested out of the debian code search, the
postgresql use case is pretty similar - probe what pages of the database
were in cache at shutdown so when you restart it you can preload these
and reach "cruse speed" faster.

Sure that's probably not billions of users but this all looks fairly
valid to me...

-- 
Dominique

  reply	other threads:[~2019-01-10 12:24 UTC|newest]

Thread overview: 161+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-01-05 17:27 [PATCH] mm/mincore: allow for making sys_mincore() privileged Jiri Kosina
2019-01-05 19:14 ` Vlastimil Babka
2019-01-05 19:24   ` Jiri Kosina
2019-01-05 19:38     ` Vlastimil Babka
2019-01-08  9:14       ` Bernd Petrovitsch
2019-01-08 11:37         ` Jiri Kosina
2019-01-08 13:53           ` Bernd Petrovitsch
2019-01-08 14:08             ` Kirill A. Shutemov
2019-01-05 19:44 ` kbuild test robot
2019-01-05 19:46 ` Linus Torvalds
2019-01-05 20:12   ` Jiri Kosina
2019-01-05 20:17     ` Linus Torvalds
2019-01-05 20:43       ` Jiri Kosina
2019-01-05 21:54         ` Linus Torvalds
2019-01-06 11:33           ` Kevin Easton
2019-01-08  8:50           ` Kevin Easton
2019-01-18 14:23           ` Tejun Heo
2019-01-05 20:13   ` Linus Torvalds
2019-01-05 19:56 ` kbuild test robot
2019-01-05 22:54 ` Jann Horn
2019-01-05 23:05   ` Linus Torvalds
2019-01-05 23:16     ` Linus Torvalds
2019-01-05 23:28       ` Linus Torvalds
2019-01-05 23:39       ` Linus Torvalds
2019-01-06  0:11         ` Matthew Wilcox
2019-01-06  0:22           ` Linus Torvalds
2019-01-06  1:50             ` Linus Torvalds
2019-01-06 21:46               ` Linus Torvalds
2019-01-08  4:43                 ` Dave Chinner
2019-01-08 17:57                   ` Linus Torvalds
2019-01-09  2:24                     ` Dave Chinner
2019-01-09  2:31                       ` Jiri Kosina
2019-01-09  4:39                         ` Dave Chinner
2019-01-09 10:08                           ` Jiri Kosina
2019-01-10  1:15                             ` Dave Chinner
2019-01-10  7:54                               ` Jiri Kosina
2019-01-09 18:25                           ` Linus Torvalds
2019-01-10  0:44                             ` Dave Chinner
2019-01-10  1:18                               ` Linus Torvalds
2019-01-10  5:26                                 ` Andy Lutomirski
2019-01-10 14:47                                   ` Matthew Wilcox
2019-01-10 21:44                                     ` Dave Chinner
2019-01-10 21:59                                       ` Linus Torvalds
2019-01-11  1:47                                   ` Dave Chinner
2019-01-10  7:03                                 ` Dave Chinner
2019-01-10 11:47                                   ` Linus Torvalds
2019-01-10 12:24                                     ` Dominique Martinet [this message]
2019-01-10 22:11                                       ` Linus Torvalds
2019-01-11  2:03                                         ` Dave Chinner
2019-01-11  2:18                                           ` Linus Torvalds
2019-01-11  4:04                                             ` Dave Chinner
2019-01-11  4:08                                               ` Andy Lutomirski
2019-01-11  7:20                                                 ` Dave Chinner
2019-01-11  7:08                                               ` Linus Torvalds
2019-01-11  7:36                                                 ` Dave Chinner
2019-01-11 16:26                                                   ` Linus Torvalds
2019-01-15 23:45                                                     ` Dave Chinner
2019-01-16  4:54                                                       ` Linus Torvalds
2019-01-16  5:49                                                         ` Linus Torvalds
2019-01-17  1:26                                                         ` Dave Chinner
2019-02-20 15:49                                                     ` Nicolai Stange
2019-01-11  4:57                                         ` Dominique Martinet
2019-01-11  7:11                                           ` Linus Torvalds
2019-01-11  7:32                                             ` Dominique Martinet
2019-01-16  0:42                                         ` Josh Snyder
2019-01-16  5:00                                           ` Linus Torvalds
2019-01-16  5:25                                             ` Andy Lutomirski
2019-01-16  5:34                                               ` Linus Torvalds
2019-01-16  5:46                                                 ` Dominique Martinet
2019-01-16  5:58                                                   ` Linus Torvalds
2019-01-16  6:34                                                     ` Dominique Martinet
2019-01-16  7:52                                                       ` Josh Snyder
2019-01-16 12:18                                                         ` Kevin Easton
2019-01-17 21:45                                                         ` Vlastimil Babka
2019-01-18  4:49                                                           ` Linus Torvalds
2019-01-18 18:58                                                             ` Vlastimil Babka
2019-01-16 16:12                                                     ` Jiri Kosina
2019-01-16 17:48                                                       ` Linus Torvalds
2019-01-16 20:23                                                         ` Jiri Kosina
2019-01-16 21:37                                                           ` Matthew Wilcox
2019-01-16 21:41                                                             ` Jiri Kosina
2019-01-17  9:52                                                               ` Cyril Hrubis
2019-01-28 13:49                                                               ` Cyril Hrubis
2019-01-17  4:51                                                             ` Linus Torvalds
2019-01-18  4:54                                                               ` Linus Torvalds
2019-01-17  1:49                                                           ` Dominique Martinet
2019-01-23 20:27                                                           ` Linus Torvalds
2019-01-23 20:35                                                             ` Linus Torvalds
2019-01-23 23:12                                                               ` Jiri Kosina
2019-01-24  0:20                                                                 ` Linus Torvalds
2019-01-24  0:24                                                             ` Dominique Martinet
2019-01-24 12:45                                                               ` Dominique Martinet
2019-01-24 14:25                                                                 ` Jiri Kosina
2019-01-27 22:35                                                                   ` Jiri Kosina
2019-01-28  0:05                                                                     ` Dominique Martinet
2019-01-29 23:52                                                                       ` Jiri Kosina
2019-01-30  9:09                                                                         ` Michal Hocko
2019-01-30 12:29                                                                           ` Jiri Kosina
2019-01-16 12:36                                             ` Matthew Wilcox
2019-01-10 14:50                               ` Matthew Wilcox
2019-01-11  7:36                               ` Jiri Kosina
2019-01-17  2:22                                 ` Dave Chinner
2019-01-17  8:18                                   ` Jiri Kosina
2019-01-17 21:06                                     ` Dave Chinner
2019-01-07  4:32             ` Dominique Martinet
2019-01-07 10:33               ` Vlastimil Babka
2019-01-07 11:08                 ` Dominique Martinet
2019-01-07 11:59                   ` Vlastimil Babka
2019-01-07 13:29                   ` Daniel Gruss
2019-01-07 10:10         ` Michael Ellerman
2019-01-05 23:09   ` Jiri Kosina
2019-01-30 12:44 ` [PATCH 0/3] mincore() and IOCB_NOWAIT adjustments Vlastimil Babka
2019-01-30 12:44   ` [PATCH 1/3] mm/mincore: make mincore() more conservative Vlastimil Babka
2019-01-31  9:43     ` Michal Hocko
2019-01-31  9:51       ` Dominique Martinet
2019-01-31 17:46       ` Josh Snyder
2019-02-01  8:56     ` Vlastimil Babka
2019-03-06 23:13     ` Andrew Morton
2019-03-07  0:01       ` Jiri Kosina
2019-03-07  0:40         ` Dominique Martinet
2019-03-07  5:46           ` Jiri Kosina
2019-01-30 12:44   ` [PATCH 2/3] mm/filemap: initiate readahead even if IOCB_NOWAIT is set for the I/O Vlastimil Babka
2019-01-30 15:04     ` Florian Weimer
2019-01-30 15:15       ` Jiri Kosina
2019-01-31 10:47         ` Florian Weimer
2019-01-31 11:34           ` Jiri Kosina
2019-01-31  9:56     ` Michal Hocko
2019-01-31 10:15       ` Jiri Kosina
2019-01-31 10:23         ` Michal Hocko
2019-01-31 10:30           ` Jiri Kosina
2019-01-31 11:32             ` Michal Hocko
2019-01-31 17:54           ` Linus Torvalds
2019-02-01  5:13             ` Dave Chinner
2019-02-01  7:05               ` Linus Torvalds
2019-02-01  7:21                 ` Linus Torvalds
2019-02-01  1:44       ` Dave Chinner
2019-02-12 15:48         ` Jiri Kosina
2019-01-31 12:04     ` Daniel Gruss
2019-01-31 12:06       ` Vlastimil Babka
2019-01-31 12:08       ` Jiri Kosina
2019-01-31 12:57         ` Daniel Gruss
2019-01-30 12:44   ` [PATCH 3/3] mm/mincore: provide mapped status when cached status is not allowed Vlastimil Babka
2019-01-31 10:09     ` Michal Hocko
2019-02-01  9:04       ` Vlastimil Babka
2019-02-01  9:11         ` Michal Hocko
2019-02-01  9:27           ` Vlastimil Babka
2019-02-06 20:14             ` Jiri Kosina
2019-02-12  3:44         ` Jiri Kosina
2019-02-12  6:36           ` Michal Hocko
2019-02-12 13:09             ` Jiri Kosina
2019-02-12 14:01               ` Michal Hocko
2019-03-06 12:11   ` [PATCH 0/3] mincore() and IOCB_NOWAIT adjustments Jiri Kosina
2019-03-06 22:35     ` Andrew Morton
2019-03-06 22:48       ` Jiri Kosina
2019-03-06 23:23         ` Andrew Morton
2019-03-06 23:32           ` Dominique Martinet
2019-03-06 23:38             ` Andrew Morton
2019-03-09 16:53               ` Linus Torvalds
2019-03-12 14:17   ` [PATCH v2 0/2] prevent mincore() page cache leaks Vlastimil Babka
2019-03-12 14:17     ` [PATCH v2 1/2] mm/mincore: make mincore() more conservative Vlastimil Babka
2019-03-12 14:17     ` [PATCH v2 2/2] mm/mincore: provide mapped status when cached status is not allowed Vlastimil Babka

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