* [Bug translator/13820] New: timer.profile(NNN) variant using perf probes
@ 2012-03-08 1:34 fche at redhat dot com
2012-03-08 1:49 ` [Bug translator/13820] " fche at redhat dot com
2015-12-02 21:30 ` flu at redhat dot com
0 siblings, 2 replies; 3+ messages in thread
From: fche at redhat dot com @ 2012-03-08 1:34 UTC (permalink / raw)
To: systemtap
http://sourceware.org/bugzilla/show_bug.cgi?id=13820
Bug #: 13820
Summary: timer.profile(NNN) variant using perf probes
Product: systemtap
Version: unspecified
Status: NEW
Severity: normal
Priority: P2
Component: translator
AssignedTo: systemtap@sourceware.org
ReportedBy: fche@redhat.com
Classification: Unclassified
It would be nice to have some syntactic sugar implemented in the
translator to present a profiling/backtrace-capable probe point
at arbitrary frequencies, and implement them in terms of
perf.hw.cpu_cycles (unscaled variant if possible), related to
the cpu core speed and the script-requested Hz rate.
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* [Bug translator/13820] timer.profile(NNN) variant using perf probes
2012-03-08 1:34 [Bug translator/13820] New: timer.profile(NNN) variant using perf probes fche at redhat dot com
@ 2012-03-08 1:49 ` fche at redhat dot com
2015-12-02 21:30 ` flu at redhat dot com
1 sibling, 0 replies; 3+ messages in thread
From: fche at redhat dot com @ 2012-03-08 1:49 UTC (permalink / raw)
To: systemtap
http://sourceware.org/bugzilla/show_bug.cgi?id=13820
--- Comment #1 from Frank Ch. Eigler <fche at redhat dot com> 2012-03-08 01:48:28 UTC ---
e.g.
probe timer.profile.hz(997) { }
could map on a 2000 MHz core to perf.hw.cpu_clock
probe perf.type(0).config(0).sample(2006018) { }
(where 2006018 would be 2,000,000,000 / 997).
This would have to be calculated at module startup time.
And it may be that we'd actually need a more complicated
function, or even some sort of baby PLL, to approximate
the desired frequency.
It would probably be unwise to map timer.{hz,ms,etc.}(NNN)
to this because this uses up scarce resources, so can't be
unprivileged-safe.
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* [Bug translator/13820] timer.profile(NNN) variant using perf probes
2012-03-08 1:34 [Bug translator/13820] New: timer.profile(NNN) variant using perf probes fche at redhat dot com
2012-03-08 1:49 ` [Bug translator/13820] " fche at redhat dot com
@ 2015-12-02 21:30 ` flu at redhat dot com
1 sibling, 0 replies; 3+ messages in thread
From: flu at redhat dot com @ 2015-12-02 21:30 UTC (permalink / raw)
To: systemtap
https://sourceware.org/bugzilla/show_bug.cgi?id=13820
Felix Lu <flu at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
CC| |flu at redhat dot com
Resolution|--- |FIXED
--- Comment #2 from Felix Lu <flu at redhat dot com> ---
Added a probe point timer.profile.freq.hz(N).
This is only accurate up to 100 hz.
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2012-03-08 1:34 [Bug translator/13820] New: timer.profile(NNN) variant using perf probes fche at redhat dot com
2012-03-08 1:49 ` [Bug translator/13820] " fche at redhat dot com
2015-12-02 21:30 ` flu at redhat dot com
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