Current File : //usr/share/mysql-test/std_data/system_tap.stp
# This systamtap script is used by the test "dynamic_tracing.test" for dynamic
# tracing. This script is executed in background by "dynamic_tracing.test" and
# SQL queries are executed concurrently. When any probe used in this script are
# hit then counter is incremented. After hitting all the 8(exp_probe_hits)
# probes, summary containing probes enabled and their hit state is printed.
#
# For the dynamic tracing of MySQL code using systemtap on Linux, the dtrace
# probes defined in the code are converted to systemtap marks by the dtrace
# tool. This dtrace tool is not used for dynamic tracing like real dtrace tool
# supplied with Sun OS, Mac, FreeBSD and Oracle Linux.
#
global query_parse_start
global query_parse_done
global select_start
global select_done
global net_read_start
global net_read_done
global handler_rdlock_start
global handler_rdlock_done
global tot_probe_hits
global exp_probe_hits
probe begin
{
query_parse_start= 0
query_parse_done= 0
select_start= 0
select_done= 0
net_read_start= 0
net_read_done= 0
handler_rdlock_start= 0
handler_rdlock_done= 0
tot_probe_hits= 0
exp_probe_hits= 8
printf("\n Dynamic tracing ...... started.\n")
}
probe process(@1).mark("query__parse__start")
{
if (query_parse_start == 0)
{
query_parse_start++
tot_probe_hits++
}
if (tot_probe_hits >= exp_probe_hits)
{
print_summary_and_exit()
}
}
probe process(@1).mark("query__parse__done")
{
if (query_parse_done == 0)
{
query_parse_done++
tot_probe_hits++
}
if (tot_probe_hits >= exp_probe_hits)
{
print_summary_and_exit()
}
}
probe process(@1).mark("select__start")
{
if (select_start == 0)
{
select_start++
tot_probe_hits++
}
if (tot_probe_hits >= exp_probe_hits)
{
print_summary_and_exit()
}
}
probe process(@1).mark("select__done")
{
if (select_done == 0)
{
select_done++
tot_probe_hits++
}
if (tot_probe_hits >= exp_probe_hits)
{
print_summary_and_exit()
}
}
probe process(@1).mark("net__read__start")
{
if (net_read_start == 0)
{
net_read_start++
tot_probe_hits++
}
if (tot_probe_hits >= exp_probe_hits)
{
print_summary_and_exit()
}
}
probe process(@1).mark("net__read__done")
{
if (net_read_done == 0)
{
net_read_done++
tot_probe_hits++
}
if (tot_probe_hits >= exp_probe_hits)
{
print_summary_and_exit()
}
}
probe process(@1).mark("handler__rdlock__start")
{
if (handler_rdlock_start == 0)
{
handler_rdlock_start++
tot_probe_hits++
}
if (tot_probe_hits >= exp_probe_hits)
{
print_summary_and_exit()
}
}
probe process(@1).mark("handler__rdlock__done")
{
if (handler_rdlock_done == 0)
{
handler_rdlock_done++
tot_probe_hits++
}
if (tot_probe_hits >= exp_probe_hits)
{
print_summary_and_exit()
}
}
function print_summary_and_exit()
{
printf("\n query-parse-start : %d", query_parse_start)
printf("\n query-parse-done : %d", query_parse_done)
printf("\n select-start : %d", select_start)
printf("\n select-done : %d", select_done)
printf("\n net-read-start : %d", net_read_start)
printf("\n net-read-done : %d", net_read_done)
printf("\n handler_rdlock_start : %d", handler_rdlock_start)
printf("\n handler_rdlock_done : %d", handler_rdlock_done)
printf("\n")
printf("\n Expected probe hits : %d", exp_probe_hits)
printf("\n Actual probe hits : %d\n", tot_probe_hits)
printf("\n Dynamic tracing ...... completed.\n\n")
exit()
}
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