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From: Andrew Morton <akpm@linux-foundation.org>
To: Chris Down <chris@chrisdown.name>,
	Johannes Weiner <hannes@cmpxchg.org>,
	linux-mm@kvack.org, linux-kernel@vger.kernel.org,
	kernel-team@fb.com, Alexey Dobriyan <adobriyan@gmail.com>
Subject: Re: [PATCH] kernel: sysctl: make drop_caches write-only
Date: Fri, 1 Nov 2019 12:35:44 -0700	[thread overview]
Message-ID: <20191101123544.c9b0024a1e8f5ddf63148b48@linux-foundation.org> (raw)
In-Reply-To: <20191101122920.798a6d61b2725da8cfe80549@linux-foundation.org>

On Fri, 1 Nov 2019 12:29:20 -0700 Andrew Morton <akpm@linux-foundation.org> wrote:

> > Either change is an upgrade from the current situation, at least. I prefer 
> > towards whatever makes the API the least confusing, which appears to be 
> > Johannes' original change, but I'd support a patch which always set it to 
> > 0 instead if it was deemed safer.
> 
> On the other hand..  As I mentioned earlier, if someone's code is
> failing because of the permissions change, they can chmod
> /proc/sys/vm/drop_caches at boot time and be happy.  They have no such
> workaround if their software misbehaves due to a read always returning
> "0".

I lied.  I can chmod things in /proc but I can't chmod things in
/proc/sys/vm.  Huh, why did we do that?


  reply	other threads:[~2019-11-01 19:35 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-31 22:16 [PATCH] kernel: sysctl: make drop_caches write-only Johannes Weiner
2019-10-31 23:28 ` Andrew Morton
2019-11-01 11:09   ` Chris Down
2019-11-01 11:09     ` Chris Down
2019-11-01 14:45     ` Johannes Weiner
2019-11-01 18:59       ` Andrew Morton
2019-11-01 19:24         ` Chris Down
2019-11-01 19:29           ` Andrew Morton
2019-11-01 19:35             ` Andrew Morton [this message]
2019-11-02 15:55               ` Alexey Dobriyan
2019-11-03 19:00                 ` Eric W. Biederman
2019-11-01 10:58 ` Chris Down
2019-11-04 10:37 ` David Hildenbrand
2019-11-04 13:25 ` Vlastimil Babka
2019-11-05  6:20 ` Michal Hocko

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