* [Bug tapsets/23761] New: generalized @entry
@ 2018-10-11 18:46 fche at redhat dot com
2018-10-18 16:26 ` [Bug tapsets/23761] " fche at redhat dot com
0 siblings, 1 reply; 2+ messages in thread
From: fche at redhat dot com @ 2018-10-11 18:46 UTC (permalink / raw)
To: systemtap
https://sourceware.org/bugzilla/show_bug.cgi?id=23761
Bug ID: 23761
Summary: generalized @entry
Product: systemtap
Version: unspecified
Status: NEW
Severity: normal
Priority: P2
Component: tapsets
Assignee: systemtap at sourceware dot org
Reporter: fche at redhat dot com
Target Milestone: ---
With the arrival of non-[uk]retprobe mechanisms to trap return events (e.g.,
tp_syscall.*.return), the traditional @entry(expression) trick is no longer
directly workable. This is because there is no mechanically-obvious entry
probe to collect the expression, and @entry($var) may need $var that are not
available at all in that form.
So we need to generalize this a bit.
One way is to introduce some macros that explicitly implement the @entry()
machinations behind the scenes:
- one macro to 'probe entry point & save variables'
- and one macro to 'probe exit point & expose saved variables'
used something like
probe syscall.* { @save(myargstr,argstr) }
probe syscall.*.return {
@restore(myargstr)
log(myargstr)
}
which would expand to code that manages a myargstr global array, tid()-indexed.
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* [Bug tapsets/23761] generalized @entry
2018-10-11 18:46 [Bug tapsets/23761] New: generalized @entry fche at redhat dot com
@ 2018-10-18 16:26 ` fche at redhat dot com
0 siblings, 0 replies; 2+ messages in thread
From: fche at redhat dot com @ 2018-10-18 16:26 UTC (permalink / raw)
To: systemtap
https://sourceware.org/bugzilla/show_bug.cgi?id=23761
Frank Ch. Eigler <fche at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Assignee|systemtap at sourceware dot org |juddin at redhat dot com
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