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?
next prev parent 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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