From: Mark Wielaard <mark@klomp.org>
To: Roland McGrath <roland@redhat.com>
Cc: Phil Muldoon <pmuldoon@redhat.com>, Frysk Hackers <frysk@sourceware.org>
Subject: Re: Optimizing watchpoints
Date: Mon, 01 Oct 2007 08:41:00 -0000 [thread overview]
Message-ID: <1191228112.3842.24.camel@dijkstra.wildebeest.org> (raw)
In-Reply-To: <20071001012529.D264A4D0325@magilla.localdomain>
Hi Roland,
On Sun, 2007-09-30 at 18:25 -0700, Roland McGrath wrote:
> (For compatibility, ptrace
> itself will use that facility to virtualize the demands made by
> PTRACE_SET_DEBUGREG and the like. ptrace uses a known priority number that
> is fairly high, so that some system-wide or other background tracing would
> have to knowingly intend to interfere with traditional user application use
> by choosing an even higher priority.)
Just a FYI. I see (through a quick kernel grep) PTRACE_SET_DEBUGREG is
only available on powerpc. For x86[_64] frysk pokes at the hardware
debug registers through the USR area and getting/setting them
"directly". This might have to become a special case of the above.
Cheers,
Mark
next prev parent reply other threads:[~2007-10-01 8:41 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-09-28 21:21 Phil Muldoon
2007-09-30 19:10 ` Mark Wielaard
2007-10-01 1:25 ` Roland McGrath
2007-10-01 8:41 ` Mark Wielaard [this message]
2007-10-01 9:11 ` Phil Muldoon
2007-10-01 9:20 ` Mark Wielaard
2007-10-01 17:40 ` Roland McGrath
2007-10-01 17:54 ` Phil Muldoon
2007-10-10 7:11 ` Phil Muldoon
2007-10-10 10:28 ` Mark Wielaard
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