* [Bug translator/20599] New: collected bit shift & variance rewritten by new histogram during elaboration
@ 2016-09-12 12:25 mcermak at redhat dot com
2016-09-13 9:54 ` [Bug translator/20599] " mcermak at redhat dot com
` (3 more replies)
0 siblings, 4 replies; 5+ messages in thread
From: mcermak at redhat dot com @ 2016-09-12 12:25 UTC (permalink / raw)
To: systemtap
https://sourceware.org/bugzilla/show_bug.cgi?id=20599
Bug ID: 20599
Summary: collected bit shift & variance rewritten by new
histogram during elaboration
Product: systemtap
Version: unspecified
Status: NEW
Severity: normal
Priority: P2
Component: translator
Assignee: systemtap at sourceware dot org
Reporter: mcermak at redhat dot com
Target Milestone: ---
Created attachment 9508
--> https://sourceware.org/bugzilla/attachment.cgi?id=9508&action=edit
proposed patch
Following script fails to compute variance correctly:
=======
$ stap --poison-cache -e 'global x probe oneshot { x<<<1 x<<<10 x<<<100
println("v: ", @variance(x, 3)) print(@hist_linear(x, 0, 100, 1)) }'
v: 1944
value |-------------------------------------------------- count
0 | 0
1 |@ 1
2 | 0
3 | 0
~
8 | 0
9 | 0
10 |@ 1
11 | 0
12 | 0
~
98 | 0
99 | 0
100 |@ 1
$
=======
In the above example, variance should have been 2997, not 1944:
=======
$ stap --poison-cache -e 'global x probe oneshot { x<<<1 x<<<10 x<<<100
println("v: ", @variance(x, 3)) }'
v: 2997
$
=======
One can check the `... -p3 | grep _stp_stat_init` output to see that in the
first case, new histogram rewrites collected stat_ops and bit_shift for given
global. This problem comes from the elaboration phase. Attached patch fixes
it.
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* [Bug translator/20599] collected bit shift & variance rewritten by new histogram during elaboration
2016-09-12 12:25 [Bug translator/20599] New: collected bit shift & variance rewritten by new histogram during elaboration mcermak at redhat dot com
@ 2016-09-13 9:54 ` mcermak at redhat dot com
2016-09-13 11:39 ` mcermak at redhat dot com
` (2 subsequent siblings)
3 siblings, 0 replies; 5+ messages in thread
From: mcermak at redhat dot com @ 2016-09-13 9:54 UTC (permalink / raw)
To: systemtap
https://sourceware.org/bugzilla/show_bug.cgi?id=20599
Martin Cermak <mcermak at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
--- Comment #1 from Martin Cermak <mcermak at redhat dot com> ---
Fixed in commit 4d0a1c2359e069c37fc9cccb1824ad22620afa9f
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* [Bug translator/20599] collected bit shift & variance rewritten by new histogram during elaboration
2016-09-12 12:25 [Bug translator/20599] New: collected bit shift & variance rewritten by new histogram during elaboration mcermak at redhat dot com
2016-09-13 9:54 ` [Bug translator/20599] " mcermak at redhat dot com
@ 2016-09-13 11:39 ` mcermak at redhat dot com
2016-09-13 11:41 ` [Bug translator/20599] histogram breaks @variance mcermak at redhat dot com
2016-09-14 11:15 ` mcermak at redhat dot com
3 siblings, 0 replies; 5+ messages in thread
From: mcermak at redhat dot com @ 2016-09-13 11:39 UTC (permalink / raw)
To: systemtap
https://sourceware.org/bugzilla/show_bug.cgi?id=20599
--- Comment #2 from Martin Cermak <mcermak at redhat dot com> ---
Created attachment 9509
--> https://sourceware.org/bugzilla/attachment.cgi?id=9509&action=edit
related testcase updates
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* [Bug translator/20599] histogram breaks @variance
2016-09-12 12:25 [Bug translator/20599] New: collected bit shift & variance rewritten by new histogram during elaboration mcermak at redhat dot com
2016-09-13 9:54 ` [Bug translator/20599] " mcermak at redhat dot com
2016-09-13 11:39 ` mcermak at redhat dot com
@ 2016-09-13 11:41 ` mcermak at redhat dot com
2016-09-14 11:15 ` mcermak at redhat dot com
3 siblings, 0 replies; 5+ messages in thread
From: mcermak at redhat dot com @ 2016-09-13 11:41 UTC (permalink / raw)
To: systemtap
https://sourceware.org/bugzilla/show_bug.cgi?id=20599
Martin Cermak <mcermak at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|collected bit shift & |histogram breaks @variance
|variance rewritten by new |
|histogram during |
|elaboration |
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* [Bug translator/20599] histogram breaks @variance
2016-09-12 12:25 [Bug translator/20599] New: collected bit shift & variance rewritten by new histogram during elaboration mcermak at redhat dot com
` (2 preceding siblings ...)
2016-09-13 11:41 ` [Bug translator/20599] histogram breaks @variance mcermak at redhat dot com
@ 2016-09-14 11:15 ` mcermak at redhat dot com
3 siblings, 0 replies; 5+ messages in thread
From: mcermak at redhat dot com @ 2016-09-14 11:15 UTC (permalink / raw)
To: systemtap
https://sourceware.org/bugzilla/show_bug.cgi?id=20599
--- Comment #3 from Martin Cermak <mcermak at redhat dot com> ---
Pushed as commit 5c6d39236741312fb0999d0b79d8d33f31388663 .
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2016-09-12 12:25 [Bug translator/20599] New: collected bit shift & variance rewritten by new histogram during elaboration mcermak at redhat dot com
2016-09-13 9:54 ` [Bug translator/20599] " mcermak at redhat dot com
2016-09-13 11:39 ` mcermak at redhat dot com
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