Repost of "tracing: Fix wasted memory in saved_cmdlines logic" (hence the v3: v2 at: https://lore.kernel.org/linux-trace-kernel/20240213115232.5fd9e...@gandalf.local.home/) That patch was based on the two other patches in this series, but I forgot to post those two other patches.
Instead of applying the update to the saved_cmdlines logic on top of the two phantom patches, apply it first. This way it can be backported nicely. I put a "Fixes" tag on it but not a Cc stable as it's more of a nice to have than fixing any bug (besides wasting some memory). The second two patches simply move code around. The goal is to keep all the saved_cmdlines logic in one place. Currently it's in two files (trace.c and trace_sched_switch.c). Since trace.c is awfully large, move all the code to trace_sched_switch.c, as that's its only purpose today anyway. The first patch is the saved_cmdlines update to consolidate memory. The second patch removes some open coded saved_cmdlines logic in trace.c into a helper function to make it a cleaner move. The last patch simply moves the code from trace.c into trace_sched_switch.c Steven Rostedt (Google) (3): tracing: Have saved_cmdlines arrays all in one allocation tracing: Move open coded processing of tgid_map into helper function tracing: Move saved_cmdline code into trace_sched_switch.c ---- kernel/trace/trace.c | 509 +------------------------------------ kernel/trace/trace.h | 10 + kernel/trace/trace_sched_switch.c | 516 ++++++++++++++++++++++++++++++++++++++ 3 files changed, 529 insertions(+), 506 deletions(-)