From: BlaisorBlade <blaisorblade_spam@yahoo.it>
To: Jeff Dike <jdike@sonycom.com>
Cc: LaurentVivier@wanadoo.fr, user-mode-linux-devel@lists.sourceforge.net
Subject: [uml-devel] Re: sysemu
Date: Mon, 30 Aug 2004 20:48:45 +0200 [thread overview]
Message-ID: <200408301722.56559.blaisorblade_personal@yahoo.it> (raw)
In-Reply-To: <20040822040821.GA7183@tp.user-mode-linux.org>
Alle 06:08, domenica 22 agosto 2004, Jeff Dike ha scritto:
> Call me a lamer, but I only now got around to looking at the sysemu
> patch in detail.
>
> As it stands, it can't be merged into mainline because it adds two
> instructions to the system call fast path. This is the sort of thing
> that make Linus and others go ballistic.
> Below, see a patch which tweaks things to eliminate both problems.
> Now, PT_SCEMU is set in conjunction with PT_TRACESYS, rather than
> one or the other, but not both, being set.
> This means that the PT_TRACESYS test in entry.S covers both cases, and
> the fast path is unchanged.
> The other change was to make syscall_trace return zero or non-zero,
> according as it should run the system call or immediately return.
> This adds a line to syscall_trace and eliminates syscall_emulate.
> The updated patch is 83 lines of diff rather than the original 128.
> I've run it with a small test program, apparently successfully, with
> good speed increases. I'm having more trouble getting a tt mode UML
> running, but I think that's a problem with the UML rather than the
> host.
> Have a look and see if it looks reasonable.
Yes, it does. You should just rename *_SCEMU to *_SYSEMU (the guest patch uses
already *_SYSEMU, which is nicer IMHO, so let's be coherent).
While you are looking at the SYSEMU patch, could you try to understand why
when SYSEMU is active (at least in SKAS mode, never done anything in TT mode)
strace does not work?
I looked at it with gdb a while ago but I wasn't able to make sense from what
I saw.
--
Paolo Giarrusso, aka Blaisorblade
Linux registered user n. 292729
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parent reply other threads:[~2004-08-30 19:27 UTC|newest]
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[parent not found: <20040822040821.GA7183@tp.user-mode-linux.org>]
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