From: "H. Peter Anvin" <hpa@zytor.com>
To: Andy Lutomirski <luto@amacapital.net>,
Linus Torvalds <torvalds@linux-foundation.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>, Ingo Molnar <mingo@redhat.com>,
Thomas Gleixner <tglx@linutronix.de>,
Peter Zijlstra <peterz@infradead.org>,
the arch/x86 maintainers <x86@kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [RFC] de-asmify the x86-64 system call slowpath
Date: Mon, 27 Jan 2014 16:22:39 -0800 [thread overview]
Message-ID: <52E6F84F.1000408@zytor.com> (raw)
In-Reply-To: <CALCETrUXjFYd7ZC958WoNk1mnPCw2kw5jt-Ywo309EObnuqFAg@mail.gmail.com>
On 01/27/2014 02:46 PM, Andy Lutomirski wrote:
>
> I think that sysret for sigreturn is probably not very interesting.
> On the other hand, sysret for #PF might be a huge win, despite being
> even scarier.
>
SYSRET for #PF or other exceptions is a nonstarter; register state is
live at that point.
-hpa
next prev parent reply other threads:[~2014-01-28 0:25 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-01-26 22:28 Linus Torvalds
2014-01-27 0:22 ` Al Viro
2014-01-27 4:32 ` Linus Torvalds
2014-01-27 4:48 ` H. Peter Anvin
2014-01-27 7:42 ` Al Viro
2014-01-27 22:06 ` Andy Lutomirski
2014-01-27 22:17 ` Linus Torvalds
2014-01-27 22:32 ` Al Viro
2014-01-27 22:43 ` Linus Torvalds
2014-01-27 22:46 ` Andy Lutomirski
2014-01-28 0:22 ` H. Peter Anvin [this message]
2014-01-28 0:44 ` Andy Lutomirski
2014-01-27 23:07 ` Al Viro
2014-01-27 10:27 ` Peter Zijlstra
2014-01-27 11:36 ` Al Viro
2014-01-27 17:39 ` Oleg Nesterov
2014-01-28 1:18 ` Al Viro
2014-01-28 16:38 ` Oleg Nesterov
2014-01-28 16:48 ` Al Viro
2014-01-28 17:19 ` Oleg Nesterov
2014-02-06 0:32 ` Linus Torvalds
2014-02-06 0:55 ` Kirill A. Shutemov
2014-02-06 2:32 ` Linus Torvalds
2014-02-06 4:33 ` Linus Torvalds
2014-02-06 21:29 ` Linus Torvalds
2014-02-06 22:24 ` Kirill A. Shutemov
2014-02-07 1:31 ` Linus Torvalds
2014-02-07 15:42 ` [RFC, PATCH] mm: map few pages around fault address if they are in page cache Kirill A. Shutemov
2014-02-07 17:32 ` Andi Kleen
2014-02-07 17:56 ` Kirill A. Shutemov
2014-02-07 18:11 ` Andi Kleen
2014-02-06 5:42 ` [RFC] de-asmify the x86-64 system call slowpath Ingo Molnar
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