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| author | Paul E. McKenney <paulmck@kernel.org> | 2020-09-09 22:05:41 -0700 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@kernel.org> | 2020-09-16 16:32:37 -0700 |
| commit | 4fe192dfbe5ba9780df699d411aa4f25ba24cf61 (patch) | |
| tree | 7996b27fe887a941a28ac6ad5e69efd62afd77ad /scripts/stackusage | |
| parent | rcu-tasks: Selectively enable more RCU Tasks Trace IPIs (diff) | |
| download | linux-4fe192dfbe5ba9780df699d411aa4f25ba24cf61.tar.gz linux-4fe192dfbe5ba9780df699d411aa4f25ba24cf61.zip | |
rcu-tasks: Shorten per-grace-period sleep for RCU Tasks Trace
The various RCU tasks flavors currently wait 100 milliseconds between each
grace period in order to prevent CPU-bound loops and to favor efficiency
over latency. However, RCU Tasks Trace needs to have a grace-period
latency of roughly 25 milliseconds, which is completely infeasible given
the 100-millisecond per-grace-period sleep. This commit therefore reduces
this sleep duration to 5 milliseconds (or one jiffy, whichever is longer)
in kernels built with CONFIG_TASKS_TRACE_RCU_READ_MB=y.
Link: https://lore.kernel.org/bpf/CAADnVQK_AiX+S_L_A4CQWT11XyveppBbQSQgH_qWGyzu_E8Yeg@mail.gmail.com/
Reported-by: Alexei Starovoitov <alexei.starovoitov@gmail.com>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: <bpf@vger.kernel.org>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Diffstat (limited to 'scripts/stackusage')
0 files changed, 0 insertions, 0 deletions