From: Linus Torvalds <torvalds@linux-foundation.org>
To: Borislav Petkov <bp@amd64.org>
Cc: Andrew Lutomirski <luto@mit.edu>,
Al Viro <viro@zeniv.linux.org.uk>,
"H. Peter Anvin" <hpa@zytor.com>, Ingo Molnar <mingo@kernel.org>,
"user-mode-linux-devel@lists.sourceforge.net"
<user-mode-linux-devel@lists.sourceforge.net>,
Richard Weinberger <richard@nod.at>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"mingo@redhat.com" <mingo@redhat.com>
Subject: Re: [uml-devel] SYSCALL, ptrace and syscall restart breakages (Re: [RFC] weird crap with vdso on uml/i386)
Date: Tue, 23 Aug 2011 09:29:29 -0700 [thread overview]
Message-ID: <CA+55aFxJF88EJ=WhPq08j4+REBgpvVHVwbg5BR05DD+exRyp8A@mail.gmail.com> (raw)
In-Reply-To: <20110823162251.GC13138@aftab>
On Tue, Aug 23, 2011 at 9:22 AM, Borislav Petkov <bp@amd64.org> wrote:
>
> I don't think that removing SYSCALL from 32-bit code just so that UML
> trapped syscalls work is something we'd like since SYSCALL is much
> cheaper than INT $0x80:
Oh yes.
System call performance is *important*. And x86 is *important*.
UML? In comparison, not that important.
So quite frankly, if this is purely an UML issue (and unless we're
missing something else, that's what it looks like, despite all the
confusion we've had so far), then if we have a choice between "remove
syscall instruction" and "remove UML", then ...
Linus
next prev parent reply other threads:[~2011-08-23 16:30 UTC|newest]
Thread overview: 161+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-08-18 18:58 Subject: [PATCH 00/91] pending uml patches Al Viro
2011-08-18 18:58 ` [uml-devel] " Al Viro
2011-08-18 19:12 ` Richard Weinberger
2011-08-18 19:12 ` [uml-devel] " Richard Weinberger
2011-08-18 19:19 ` Al Viro
2011-08-18 19:19 ` [uml-devel] " Al Viro
2011-08-19 4:31 ` Al Viro
2011-08-19 8:51 ` Richard Weinberger
2011-08-19 8:51 ` [uml-devel] " Richard Weinberger
2011-08-20 1:18 ` [RFC] weird crap with vdso on uml/i386 Al Viro
2011-08-20 15:22 ` Richard Weinberger
2011-08-20 20:14 ` Al Viro
2011-08-20 20:14 ` [uml-devel] " Al Viro
2011-08-20 20:55 ` Richard Weinberger
2011-08-20 21:26 ` Andrew Lutomirski
2011-08-20 21:26 ` Andrew Lutomirski
2011-08-20 21:38 ` Richard Weinberger
2011-08-20 21:38 ` [uml-devel] " Richard Weinberger
2011-08-20 21:40 ` Andrew Lutomirski
2011-08-20 21:40 ` [uml-devel] " Andrew Lutomirski
2011-08-21 6:34 ` Al Viro
2011-08-21 6:34 ` [uml-devel] " Al Viro
2011-08-21 8:42 ` SYSCALL, ptrace and syscall restart breakages (Re: [RFC] weird crap with vdso on uml/i386) Al Viro
2011-08-21 8:42 ` [uml-devel] " Al Viro
2011-08-21 11:24 ` Andrew Lutomirski
2011-08-21 11:24 ` [uml-devel] " Andrew Lutomirski
2011-08-21 13:37 ` Andrew Lutomirski
2011-08-21 13:37 ` [uml-devel] " Andrew Lutomirski
2011-08-21 14:51 ` Al Viro
2011-08-21 14:51 ` [uml-devel] " Al Viro
2011-08-21 14:43 ` Al Viro
2011-08-21 16:41 ` Al Viro
2011-08-21 16:41 ` [uml-devel] " Al Viro
2011-08-22 0:44 ` Andrew Lutomirski
2011-08-22 0:44 ` Andrew Lutomirski
2011-08-22 1:09 ` Linus Torvalds
2011-08-22 1:19 ` Al Viro
2011-08-22 1:19 ` [uml-devel] " Al Viro
2011-08-22 1:19 ` H. Peter Anvin
2011-08-22 1:19 ` [uml-devel] " H. Peter Anvin
2011-08-22 21:25 ` [tip:x86/urgent] x86-32, vdso: On system call restart after SYSENTER, use int $0x80 tip-bot for H. Peter Anvin
2011-08-23 23:40 ` tip-bot for H. Peter Anvin
2011-08-22 1:16 ` SYSCALL, ptrace and syscall restart breakages (Re: [RFC] weird crap with vdso on uml/i386) Al Viro
2011-08-22 1:16 ` [uml-devel] " Al Viro
2011-08-22 1:41 ` Linus Torvalds
2011-08-22 1:41 ` [uml-devel] " Linus Torvalds
2011-08-22 1:48 ` H. Peter Anvin
2011-08-22 1:48 ` [uml-devel] " H. Peter Anvin
2011-08-22 2:01 ` Andrew Lutomirski
2011-08-22 2:01 ` [uml-devel] " Andrew Lutomirski
2011-08-22 2:07 ` Al Viro
2011-08-22 2:07 ` [uml-devel] " Al Viro
2011-08-22 2:26 ` Andrew Lutomirski
2011-08-22 2:26 ` [uml-devel] " Andrew Lutomirski
2011-08-22 2:34 ` H. Peter Anvin
2011-08-22 2:34 ` [uml-devel] " H. Peter Anvin
2011-08-22 4:05 ` H. Peter Anvin
2011-08-22 4:05 ` [uml-devel] " H. Peter Anvin
2011-08-22 9:53 ` Ingo Molnar
2011-08-22 13:34 ` Andrew Lutomirski
2011-08-22 13:34 ` Andrew Lutomirski
2011-08-22 14:40 ` Borislav Petkov
2011-08-22 14:40 ` Borislav Petkov
2011-08-22 15:13 ` Al Viro
2011-08-22 15:13 ` Al Viro
2011-08-22 20:05 ` Linus Torvalds
2011-08-22 20:05 ` Linus Torvalds
2011-08-22 20:11 ` H. Peter Anvin
2011-08-22 20:11 ` H. Peter Anvin
2011-08-22 21:52 ` Andrew Lutomirski
2011-08-22 21:52 ` Andrew Lutomirski
2011-08-22 22:04 ` H. Peter Anvin
2011-08-22 22:04 ` H. Peter Anvin
2011-08-22 23:27 ` Linus Torvalds
2011-08-22 23:46 ` H. Peter Anvin
2011-08-22 23:46 ` H. Peter Anvin
2011-08-23 0:03 ` Al Viro
2011-08-23 0:03 ` Al Viro
2011-08-23 0:07 ` Al Viro
2011-08-23 0:07 ` Al Viro
2011-08-23 0:07 ` H. Peter Anvin
2011-08-23 0:07 ` H. Peter Anvin
2011-08-23 0:22 ` Linus Torvalds
2011-08-23 0:22 ` Linus Torvalds
2011-08-23 1:01 ` Al Viro
2011-08-23 1:13 ` Al Viro
2011-08-23 1:13 ` Al Viro
2011-08-23 1:59 ` Linus Torvalds
2011-08-23 1:59 ` Linus Torvalds
2011-08-23 2:59 ` Al Viro
2011-08-23 2:59 ` Al Viro
2011-08-23 2:17 ` Al Viro
2011-08-23 6:15 ` Al Viro
2011-08-23 14:26 ` Borislav Petkov
2011-08-23 16:30 ` Al Viro
2011-08-23 16:30 ` Al Viro
2011-08-23 16:03 ` Linus Torvalds
2011-08-23 16:03 ` Linus Torvalds
2011-08-23 16:11 ` Andrew Lutomirski
2011-08-23 16:11 ` Andrew Lutomirski
2011-08-23 16:20 ` Linus Torvalds
2011-08-23 16:20 ` Linus Torvalds
2011-08-23 17:33 ` Al Viro
2011-08-23 17:33 ` Al Viro
2011-08-23 18:04 ` Al Viro
2011-08-23 18:04 ` Al Viro
2011-08-24 12:44 ` [PATCH] x86, asm: Document some of the syscall asm glue Borislav Petkov
2011-08-23 16:22 ` [uml-devel] SYSCALL, ptrace and syscall restart breakages (Re: [RFC] weird crap with vdso on uml/i386) Borislav Petkov
2011-08-23 16:29 ` Linus Torvalds [this message]
2011-08-23 16:53 ` Al Viro
2011-08-23 16:53 ` Al Viro
2011-08-23 16:58 ` Richard Weinberger
2011-08-23 16:58 ` Richard Weinberger
2011-08-23 17:07 ` Al Viro
2011-08-23 17:07 ` Al Viro
2011-08-23 17:29 ` Richard Weinberger
2011-08-23 17:29 ` Richard Weinberger
2011-08-25 0:05 ` Richard Weinberger
2011-08-23 19:15 ` H. Peter Anvin
2011-08-23 19:15 ` H. Peter Anvin
2011-08-23 20:56 ` Borislav Petkov
2011-08-23 21:06 ` H. Peter Anvin
2011-08-23 21:10 ` Borislav Petkov
2011-08-23 23:04 ` H. Peter Anvin
2011-08-23 23:04 ` H. Peter Anvin
2011-08-24 21:10 ` H. Peter Anvin
2011-08-24 21:10 ` H. Peter Anvin
2011-08-23 16:48 ` Al Viro
2011-08-23 16:48 ` Al Viro
2011-08-23 17:33 ` Linus Torvalds
2011-08-23 17:33 ` Linus Torvalds
2011-08-23 21:08 ` H. Peter Anvin
2011-08-23 21:08 ` H. Peter Anvin
2011-08-23 21:20 ` Linus Torvalds
2011-08-23 21:20 ` Linus Torvalds
2011-08-23 23:04 ` H. Peter Anvin
2011-08-23 23:04 ` H. Peter Anvin
2011-08-23 19:18 ` H. Peter Anvin
2011-08-23 19:18 ` H. Peter Anvin
2011-08-23 19:24 ` Linus Torvalds
2011-08-23 19:24 ` Linus Torvalds
2011-08-23 19:26 ` H. Peter Anvin
2011-08-23 19:26 ` H. Peter Anvin
2011-08-23 19:41 ` Al Viro
2011-08-23 19:41 ` Al Viro
2011-08-23 19:43 ` Linus Torvalds
2011-08-23 19:43 ` Linus Torvalds
2011-08-23 21:17 ` Al Viro
2011-08-23 21:17 ` Al Viro
2011-08-23 1:16 ` Andrew Lutomirski
2011-08-23 1:18 ` H. Peter Anvin
2011-08-23 1:18 ` H. Peter Anvin
2011-08-22 4:07 ` Al Viro
2011-08-22 4:11 ` H. Peter Anvin
2011-08-22 4:11 ` [uml-devel] " H. Peter Anvin
2011-08-22 4:26 ` Al Viro
2011-08-22 4:26 ` [uml-devel] " Al Viro
2011-08-22 5:03 ` H. Peter Anvin
2011-08-22 5:03 ` [uml-devel] " H. Peter Anvin
2011-08-23 5:10 ` Andrew Lutomirski
2011-08-23 5:10 ` [uml-devel] " Andrew Lutomirski
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