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| author | Paul E. McKenney <paulmck@kernel.org> | 2022-05-24 06:50:11 +0300 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@kernel.org> | 2022-06-20 19:22:27 +0300 |
| commit | 3847b64570b1753e9863a4106aec03f4d68e7b17 (patch) | |
| tree | f2ff9588ddb2952f984004b86368b694b24300a8 /include/linux/sched.h | |
| parent | 4a8cc433b8bf3106cf7b1173a936c62d77b40b40 (diff) | |
| download | linux-3847b64570b1753e9863a4106aec03f4d68e7b17.tar.xz | |
rcu-tasks: Merge state into .b.need_qs and atomically update
This commit gets rid of the task_struct structure's ->trc_reader_checked
field, making it instead be a bit within the task_struct structure's
existing ->trc_reader_special.b.need_qs field. This commit also
atomically loads, stores, and checks the resulting combination of the
reader-checked and need-quiescent state flags. This will in turn allow
significant simplification of the rcu_tasks_trace_postgp() function
as well as elimination of the trc_n_readers_need_end counter in later
commits. These changes will in turn simplify later elimination of the
RCU Tasks Trace scan of the task list, which will make RCU Tasks Trace
grace periods less CPU-intensive.
[ paulmck: Apply kernel test robot feedback. ]
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Cc: Neeraj Upadhyay <quic_neeraju@quicinc.com>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Andrii Nakryiko <andrii@kernel.org>
Cc: Martin KaFai Lau <kafai@fb.com>
Cc: KP Singh <kpsingh@kernel.org>
Diffstat (limited to 'include/linux/sched.h')
| -rw-r--r-- | include/linux/sched.h | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/include/linux/sched.h b/include/linux/sched.h index c46f3a63b758..e6eb5871593e 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -843,7 +843,6 @@ struct task_struct { int trc_reader_nesting; int trc_ipi_to_cpu; union rcu_special trc_reader_special; - bool trc_reader_checked; struct list_head trc_holdout_list; #endif /* #ifdef CONFIG_TASKS_TRACE_RCU */ |