tracing: Place trace_pid_list logic into abstract functions

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Instead of having the logic that does trace_pid_list open coded, wrap it in
abstract functions. This will allow a rewrite of the logic that implements
the trace_pid_list without affecting the users.

Note, this causes a change in behavior. Every time a pid is written into
the set_*_pid file, it creates a new list and uses RCU to update it. If
pid_max is lowered, but there was a pid currently in the list that was
higher than pid_max, those pids will now be removed on updating the list.
The old behavior kept that from happening.

The rewrite of the pid_list logic will no longer depend on pid_max,
and will return the old behavior.

Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

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This commit is contained in:

Steven Rostedt (VMware) 2021-09-23 21:03:49 -04:00

parent bf094cffea

commit 6954e41526

7 changed files with 217 additions and 61 deletions

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1

kernel/trace/Makefile

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6

kernel/trace/ftrace.c

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160

kernel/trace/pid_list.c

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13

kernel/trace/pid_list.h

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78

kernel/trace/trace.c

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14

kernel/trace/trace.h

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6

kernel/trace/trace_events.c

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