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[Bug runtime/6504] New: change _stp_print_flush to avoid calling into kernel/relay.c
- From: "fche at redhat dot com" <sourceware-bugzilla at sourceware dot org>
- To: systemtap at sources dot redhat dot com
- Date: 9 May 2008 19:59:02 -0000
- Subject: [Bug runtime/6504] New: change _stp_print_flush to avoid calling into kernel/relay.c
- Reply-to: sourceware-bugzilla at sourceware dot org
Following from bug #6487, we need to reduce the regions of the kernel
that are dynamically reachable from probe handlers. For this particular
case, _stp_print_flush should avoid calling into the relay subsystem
(on modern kernels) and instead use some other mechanism to flag
available data.
I'm told lttng uses more conservative code (setting a
flag; having a separate worker/timer thread manage data copying, or
something like that). Considering the many copies we already suffer
in sending data to userspace, this sort of thing would not be a big
hit.
--
Summary: change _stp_print_flush to avoid calling into
kernel/relay.c
Product: systemtap
Version: unspecified
Status: NEW
Severity: normal
Priority: P2
Component: runtime
AssignedTo: systemtap at sources dot redhat dot com
ReportedBy: fche at redhat dot com
http://sourceware.org/bugzilla/show_bug.cgi?id=6504
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