From: Andi Kleen <andi@firstfloor.org>
To: "Kirill A. Shutemov" <kirill@shutemov.name>
Cc: Andi Kleen <andi@firstfloor.org>, Ingo Molnar <mingo@elte.hu>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [PATCH] x86_64: Implement personality ADDR_LIMIT_32BIT
Date: Mon, 6 Oct 2008 11:56:28 +0200 [thread overview]
Message-ID: <20081006095628.GE3180@one.firstfloor.org> (raw)
In-Reply-To: <20081006091709.GB20852@localhost.localdomain>
> > And personality() is not thread local/safe, so it's not a particularly
> > good interface to use later.
>
> qemu can call personality() before any threads will be created.
It still makes it unsuitable for a lot of other applications.
e.g. a JVM using 32bit pointers couldn't use it because it would
affect native C threads running in the same process.
>
> > Per system call switches are preferable
> > and more flexible.
>
> Per syscall switches are cool, but I don't see any advantage from it for
> qemu.
Linux interfaces are not supposed to be "interfaces for qemu" but generally
applicable interfaces.
-Andi
--
ak@linux.intel.com
WARNING: multiple messages have this Message-ID (diff)
From: Andi Kleen <andi@firstfloor.org>
To: "Kirill A. Shutemov" <kirill@shutemov.name>
Cc: Andi Kleen <andi@firstfloor.org>, Ingo Molnar <mingo@elte.hu>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [PATCH] x86_64: Implement personality ADDR_LIMIT_32BIT
Date: Mon, 6 Oct 2008 11:56:28 +0200 [thread overview]
Message-ID: <20081006095628.GE3180@one.firstfloor.org> (raw)
In-Reply-To: <20081006091709.GB20852@localhost.localdomain>
> > And personality() is not thread local/safe, so it's not a particularly
> > good interface to use later.
>
> qemu can call personality() before any threads will be created.
It still makes it unsuitable for a lot of other applications.
e.g. a JVM using 32bit pointers couldn't use it because it would
affect native C threads running in the same process.
>
> > Per system call switches are preferable
> > and more flexible.
>
> Per syscall switches are cool, but I don't see any advantage from it for
> qemu.
Linux interfaces are not supposed to be "interfaces for qemu" but generally
applicable interfaces.
-Andi
--
ak@linux.intel.com
--
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next prev parent reply other threads:[~2008-10-06 9:50 UTC|newest]
Thread overview: 53+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-10-03 7:04 [PATCH] x86_64: Implement personality ADDR_LIMIT_32BIT Kirill A. Shutemov
2008-10-03 7:04 ` Kirill A. Shutemov
2008-10-03 8:02 ` Ingo Molnar
2008-10-03 8:02 ` Ingo Molnar
2008-10-03 9:25 ` Kirill A. Shutemov
2008-10-03 12:44 ` Arjan van de Ven
2008-10-03 12:44 ` Arjan van de Ven
2008-10-03 12:58 ` Kirill A. Shutemov
2008-10-06 6:13 ` Andi Kleen
2008-10-06 6:13 ` Andi Kleen
2008-10-06 8:17 ` Kirill A. Shutemov
2008-10-06 8:42 ` Andi Kleen
2008-10-06 8:42 ` Andi Kleen
2008-10-06 9:17 ` Kirill A. Shutemov
2008-10-06 9:56 ` Andi Kleen [this message]
2008-10-06 9:56 ` Andi Kleen
2008-10-06 10:12 ` Kirill A. Shutemov
2008-10-06 13:26 ` Andi Kleen
2008-10-06 13:26 ` Andi Kleen
2008-10-06 14:37 ` [PATCH, RFC] shmat: introduce flag SHM_MAP_HINT Kirill A. Shutemov
2008-10-06 14:37 ` Kirill A. Shutemov
2008-10-06 19:29 ` Andi Kleen
2008-10-06 19:29 ` Andi Kleen
2008-10-07 6:57 ` Kirill A. Shutemov
2008-10-07 6:57 ` [PATCH, RFC, v2] " Kirill A. Shutemov
2008-10-07 6:57 ` Kirill A. Shutemov
2008-10-07 8:20 ` Andi Kleen
2008-10-07 8:20 ` Andi Kleen
2008-10-07 10:09 ` Kirill A. Shutemov
2008-10-07 11:26 ` Andi Kleen
2008-10-07 11:26 ` Andi Kleen
2008-10-07 11:23 ` Kirill A. Shutemov
2008-10-07 14:38 ` Hugh Dickins
2008-10-07 14:38 ` Hugh Dickins
2008-10-07 15:10 ` Andi Kleen
2008-10-07 15:10 ` Andi Kleen
2008-10-07 11:08 ` [PATCH, RFC] " KOSAKI Motohiro
2008-10-07 11:08 ` KOSAKI Motohiro
2008-10-07 11:21 ` Andi Kleen
2008-10-07 11:21 ` Andi Kleen
2008-10-07 11:21 ` Kirill A. Shutemov
2008-10-07 11:26 ` KOSAKI Motohiro
2008-10-07 11:26 ` KOSAKI Motohiro
2008-10-07 11:30 ` Kirill A. Shutemov
2008-10-07 11:50 ` Andi Kleen
2008-10-07 11:50 ` Andi Kleen
2008-10-07 11:24 ` Kirill A. Shutemov
2008-10-07 12:31 ` Alan Cox
2008-10-07 12:31 ` Alan Cox
2008-10-07 13:14 ` Andi Kleen
2008-10-07 13:14 ` Andi Kleen
2008-10-03 9:33 ` [PATCH] x86_64: Implement personality ADDR_LIMIT_32BIT Kirill A. Shutemov
2008-10-03 9:33 ` Kirill A. Shutemov
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