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Subject: Re: [PATCH 6/9] x86, pkeys: add pkey set/get syscalls
References: <20160707124719.3F04C882@viggo.jf.intel.com>
 <20160707124728.C1116BB1@viggo.jf.intel.com>
 <20160707144508.GZ11498@techsingularity.net> <577E924C.6010406@sr71.net>
 <20160708071810.GA27457@gmail.com>
From: Dave Hansen <dave@sr71.net>
Message-ID: <577FD587.6050101@sr71.net>
Date: Fri, 8 Jul 2016 09:32:07 -0700
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Sender: owner-linux-mm@kvack.org
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To: Ingo Molnar <mingo@kernel.org>
Cc: Mel Gorman <mgorman@techsingularity.net>, linux-kernel@vger.kernel.org, x86@kernel.org, linux-api@vger.kernel.org, linux-arch@vger.kernel.org, linux-mm@kvack.org, torvalds@linux-foundation.org, akpm@linux-foundation.org, dave.hansen@linux.intel.com, arnd@arndb.de, hughd@google.com, viro@zeniv.linux.org.uk

On 07/08/2016 12:18 AM, Ingo Molnar wrote:
> So the question is, what is user-space going to do? Do any glibc
> patches exist? How are the user-space library side APIs going to look
> like?

My goal at the moment is to get folks enabled to the point that they can
start modifying apps to use pkeys without having to patch their kernels.
 I don't have confidence that we can design good high-level userspace
interfaces without seeing some real apps try to use the low-level ones
and seeing how they struggle.

I had some glibc code to do the pkey alloc/free operations, but those
aren't necessary if we're doing it in the kernel.  Other than getting
the syscall wrappers in place, I don't have any immediate plans to do
anything in glibc.

Was there something you were expecting to see?

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