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author | Steven Rostedt (VMware) <rostedt@goodmis.org> | 2017-03-29 22:45:18 -0400 |
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committer | Steven Rostedt (VMware) <rostedt@goodmis.org> | 2017-03-31 18:00:45 -0400 |
commit | 5bd84629a7a0e2462c28ca52e213ebe27fadfee8 (patch) | |
tree | 9fef370dae724a4822358278d0591ba5da1c3a4f /init | |
parent | 43ff926a0c3a0cfd6aa313c3232420f009ab43e8 (diff) |
ftrace: Create separate t_func_next() to simplify the function / hash logic
I noticed that if I use dd to read the set_ftrace_filter file that the first
hash command is repeated.
# cd /sys/kernel/debug/tracing
# echo schedule > set_ftrace_filter
# echo do_IRQ >> set_ftrace_filter
# echo schedule:traceoff >> set_ftrace_filter
# echo do_IRQ:traceoff >> set_ftrace_filter
# cat set_ftrace_filter
schedule
do_IRQ
schedule:traceoff:unlimited
do_IRQ:traceoff:unlimited
# dd if=set_ftrace_filter bs=1
schedule
do_IRQ
schedule:traceoff:unlimited
schedule:traceoff:unlimited
do_IRQ:traceoff:unlimited
98+0 records in
98+0 records out
98 bytes copied, 0.00265011 s, 37.0 kB/s
This is due to the way t_start() calls t_next() as well as the seq_file
calls t_next() and the state is slightly different between the two. Namely,
t_start() will call t_next() with a local "pos" variable.
By separating out the function listing from t_next() into its own function,
we can have better control of outputting the functions and the hash of
triggers. This simplifies the code.
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'init')
0 files changed, 0 insertions, 0 deletions