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tracing: make testing syscall events a separate configuration 

Parag noticed that the number of event tests has increased tremendously:

grep "Testing event" dmesg.31rc9 |wc -l
100

grep "Testing event" dmesg.31git |wc -l
1172

This is due to the testing of every syscall event when ftrace self
test is enabled. This adds a bit more time to kernel boot up and can
affect development by slowing down the time it takes between reboots.

This option makes the testing of the syscall events into a separate
config, to still be able to test most of ftrace internals at boot up
but not have to wait for all the syscall events to be tested.

The syscall event testing only tests the enabling and disabling of
the trace point, since the syscalls are not executed. What really needs
to be done is to somehow have a userspace tool test the syscall tracepoints
as well.

Reported-by: Parag Warudkar <parag.lkml@gmail.com>
LKML-Reference: <f7848160909130815l3e768a30n3b28808bbe5c254b@mail.gmail.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt 2009-09-14 11:58:24 -04:00 committed by Steven Rostedt
parent 20a58a7723
commit 1f5a6b4541
2 changed files with 24 additions and 0 deletions
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12
kernel/trace/Kconfig
View File

@ -469,6 +469,18 @@ config FTRACE_STARTUP_TEST
functioning properly. It will do tests on all the configured
tracers of ftrace.
config EVENT_TRACE_TEST_SYSCALLS
bool "Run selftest on syscall events"
depends on FTRACE_STARTUP_TEST
help
This option will also enable testing every syscall event.
It only enables the event and disables it and runs various loads
with the event enabled. This adds a bit more time for kernel boot
up since it runs this on every system call defined.
TBD - enable a way to actually call the syscalls as we test their
events
config MMIOTRACE
bool "Memory mapped IO tracing"
depends on HAVE_MMIOTRACE_SUPPORT && PCI

12
kernel/trace/trace_events.c
View File

@ -1326,6 +1326,18 @@ static __init void event_trace_self_tests(void)
if (!call->regfunc)
continue;
/*
* Testing syscall events here is pretty useless, but
* we still do it if configured. But this is time consuming.
* What we really need is a user thread to perform the
* syscalls as we test.
*/
#ifndef CONFIG_EVENT_TRACE_TEST_SYSCALLS
if (call->system &&
strcmp(call->system, "syscalls") == 0)
continue;
#endif
pr_info("Testing event %s: ", call->name);
/*