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torture: Grace periods do not piggyback off of themselves 

The rcuperf trace-event processing counted every "done" trace event
as a piggyback, which is incorrect because the task that started the
grace period didn't piggyback at all.  This commit fixes this problem
by recording the task that started a given grace period and ignoring
that task's "done" record for that grace period.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
This commit is contained in:
Paul E. McKenney 2018-01-30 23:12:27 -08:00
parent cc839ce55d
commit 0da8c08d71
1 changed files with 2 additions and 1 deletions
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3
tools/testing/selftests/rcutorture/bin/kvm-recheck-rcuperf-ftrace.sh
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@ -44,6 +44,7 @@ $8 == "start" {
starttask = $1;
starttime = $3;
startseq = $7;
seqtask[startseq] = starttask;
}
$8 == "end" {
@ -62,7 +63,7 @@ $8 == "end" {
}
}
$8 == "done" {
$8 == "done" && seqtask[$7] != $1 {
piggybackcnt[$1]++;
}