From: "fche at redhat dot com" <sourceware-bugzilla@sourceware.org>
To: systemtap@sources.redhat.com
Subject: [Bug runtime/10013] Support ENABLED sdt probe macro
Date: Sun, 05 Apr 2009 21:56:00 -0000 [thread overview]
Message-ID: <20090405215642.16110.qmail@sourceware.org> (raw)
In-Reply-To: <20090330093705.10013.mjw@redhat.com>
------- Additional Comments From fche at redhat dot com 2009-04-05 21:56 -------
> Maybe we can teach uprobes to replace with a specific move/assignment
> instruction instead of a trap instruction.
This optimization is the same as in the "move immediate" kernel markers.
However, it is not a *substitute* for a trap. It is only a substitute
for a condition evaluation.
> Then instead of with a normal STAP_PROBE replacing a "nop" with "int3", you
> would replace the "mov $0x0, %somereg" with "mov $0x1, %somereg".
You still need some way to enter the kernel.
--
http://sourceware.org/bugzilla/show_bug.cgi?id=10013
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next prev parent reply other threads:[~2009-04-05 21:56 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-03-30 12:14 [Bug runtime/10013] New: " mjw at redhat dot com
2009-03-30 18:48 ` [Bug runtime/10013] " fche at redhat dot com
2009-04-05 19:17 ` mjw at redhat dot com
2009-04-05 21:56 ` fche at redhat dot com [this message]
2009-04-05 22:22 ` mjw at redhat dot com
2009-04-16 15:21 ` scox at redhat dot com
2009-11-05 13:57 ` fche at redhat dot com
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