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| author | Paul E. McKenney <paulmck@kernel.org> | 2024-11-06 15:42:06 -0800 |
|---|---|---|
| committer | Uladzislau Rezki (Sony) <urezki@gmail.com> | 2024-12-14 17:05:27 +0100 |
| commit | 282e06cc8f595e999f778bd284d6a3608f7d1d62 (patch) | |
| tree | 36c9257bff40e21a165903bf1d55d72a6eca785a /Documentation/admin-guide | |
| parent | cae7f6319e6451dc49e4239652c6c7b6f54008d2 (diff) | |
| download | linux-next-282e06cc8f595e999f778bd284d6a3608f7d1d62.tar.gz linux-next-282e06cc8f595e999f778bd284d6a3608f7d1d62.zip | |
rcutorture: Add parameters to control polled/conditional wait interval
This commit adds rcutorture module parameters gp_cond_wi, gp_cond_wi_exp,
gp_poll_wi, and gp_poll_wi_exp to control the wait interval for
conditional, conditional expedited, polled, and polled expedited grace
periods, respectively. When rcu_torture_writer() is testing these types
of grace periods, hrtimers are used to randomly wait up to the specified
number of microseconds, but with nanosecond granularity.
In the case of conditional grace periods (get_state_synchronize_rcu()
and cond_synchronize_rcu(), for example) there is just one
wait. For polled grace periods (start_poll_synchronize_rcu() and
poll_state_synchronize_rcu(), for example), there is a repeated series
of waits until the grace period ends.
For normal grace periods, the default is 16 jiffies (for example, 16,000
microseconds on a HZ=1000 system) and for expedited grace periods the
default is 128 microseconds.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
Diffstat (limited to 'Documentation/admin-guide')
| -rw-r--r-- | Documentation/admin-guide/kernel-parameters.txt | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index 03d13ca0604f..3152f2c1da29 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -5380,6 +5380,25 @@ concurrent normal grace periods into account, if available. + rcutorture.gp_cond_wi= [KNL] + Nominal wait interval for normal conditional + grace periods (specified by rcutorture's + gp_cond and gp_cond_full module parameters), + in microseconds. The actual wait interval will + be randomly selected to nanosecond granularity up + to this wait interval. Defaults to 16 jiffies, + for example, 16,000 microseconds on a system + with HZ=1000. + + rcutorture.gp_cond_wi_exp= [KNL] + Nominal wait interval for expedited conditional + grace periods (specified by rcutorture's + gp_cond_exp and gp_cond_exp_full module + parameters), in microseconds. The actual wait + interval will be randomly selected to nanosecond + granularity up to this wait interval. Defaults to + 128 microseconds. + rcutorture.gp_exp= [KNL] Use expedited update-side primitives, if available. @@ -5405,6 +5424,25 @@ primitives that also take concurrent normal grace periods into account, if available. + rcutorture.gp_poll_wi= [KNL] + Nominal wait interval for normal conditional + grace periods (specified by rcutorture's + gp_poll and gp_poll_full module parameters), + in microseconds. The actual wait interval will + be randomly selected to nanosecond granularity up + to this wait interval. Defaults to 16 jiffies, + for example, 16,000 microseconds on a system + with HZ=1000. + + rcutorture.gp_poll_wi_exp= [KNL] + Nominal wait interval for expedited conditional + grace periods (specified by rcutorture's + gp_poll_exp and gp_poll_exp_full module + parameters), in microseconds. The actual wait + interval will be randomly selected to nanosecond + granularity up to this wait interval. Defaults to + 128 microseconds. + rcutorture.gp_sync= [KNL] Use normal (non-expedited) synchronous update-side primitives, if available. If all |