40 lines
1.4 KiB
Diff
40 lines
1.4 KiB
Diff
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From 39fe2093254db5d4cd223e7d9c228689ba6382ca Mon Sep 17 00:00:00 2001
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From: Jakub Hrozek <jhrozek@redhat.com>
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Date: Mon, 28 Nov 2016 08:44:04 +0100
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Subject: [PATCH 38/39] STAP: Only print transaction statistics if the script
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caught some transactions
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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If the script measured an 'id' run from the cache, there would be no
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transactions and dereferencing the aggrefate would throw an error.
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Reviewed-by: Fabiano Fidêncio <fidencio@redhat.com>
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(cherry picked from commit 150a0cc8fe1936002af136e5552ef6cdd210956f)
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(cherry picked from commit e6c74de2cbc9b0b713ed6dadbfef80c7c1b5cd51)
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---
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contrib/systemtap/id_perf.stp | 6 ++++--
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1 file changed, 4 insertions(+), 2 deletions(-)
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diff --git a/contrib/systemtap/id_perf.stp b/contrib/systemtap/id_perf.stp
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index 0ad619506..a7789750f 100644
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--- a/contrib/systemtap/id_perf.stp
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+++ b/contrib/systemtap/id_perf.stp
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@@ -64,8 +64,10 @@ function print_report()
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}
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}
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- printf("The most expensive transaction breakdown, per transaction:\n")
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- print(@hist_linear(bts[max_trans_time_bt], 0, 500, 50))
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+ if (max_trans_time > 0) {
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+ printf("The most expensive transaction breakdown, per transaction:\n")
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+ print(@hist_linear(bts[max_trans_time_bt], 0, 500, 50))
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+ }
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}
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probe process("/usr/bin/id").begin
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--
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2.11.0
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