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| author |   Joel Fernandes <joelagnelf@nvidia.com> | 2025-02-16 06:52:20 -0500 |
|---|---|---|
| committer | Joel Fernandes <joelagnelf@nvidia.com> | 2025-05-16 11:13:27 -0400 |
| commit | aafe12f980640c33882a1d09992560cdf11fbd6f (patch) | |
| tree | e7c46d70047230b352aaaddc6bb801eb4288282b /Documentation/admin-guide | |
| parent | torture: Add testing of RCU's Rust bindings to torture.sh (diff) | |
| download | linux-rng-aafe12f980640c33882a1d09992560cdf11fbd6f.tar.xz linux-rng-aafe12f980640c33882a1d09992560cdf11fbd6f.zip | |
rcutorture: Perform more frequent testing of ->gpwrap
Currently, the ->gpwrap is not tested (at all per my testing) due to the
requirement of a large delta between a CPU's rdp->gp_seq and its node's
rnp->gpseq.
This results in no testing of ->gpwrap being set. This patch by default
adds 5 minutes of testing with ->gpwrap forced by lowering the delta
between rdp->gp_seq and rnp->gp_seq to just 8 GPs. All of this is
configurable, including the active time for the setting and a full
testing cycle.
By default, the first 25 minutes of a test will have the _default_
behavior there is right now (ULONG_MAX / 4) delta. Then for 5 minutes,
we switch to a smaller delta causing 1-2 wraps in 5 minutes. I believe
this is reasonable since we at least add a little bit of testing for
usecases where ->gpwrap is set.
[ Apply fix for Dan Carpenter's bug report on init path cleanup. ]
[ Apply kernel doc warning fix from Akira Yokosawa. ]
Tested-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Joel Fernandes <joelagnelf@nvidia.com>
Diffstat (limited to 'Documentation/admin-guide')
| -rw-r--r-- | Documentation/admin-guide/kernel-parameters.txt | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index 76e538c77e31..50d90b2542d1 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -5657,6 +5657,31 @@ are zero, rcutorture acts as if is interpreted they are all non-zero. + rcutorture.gpwrap_lag= [KNL] + Enable grace-period wrap lag testing. Setting + to false prevents the gpwrap lag test from + running. Default is true. + + rcutorture.gpwrap_lag_gps= [KNL] + Set the value for grace-period wrap lag during + active lag testing periods. This controls how many + grace periods differences we tolerate between + rdp and rnp's gp_seq before setting overflow flag. + The default is always set to 8. + + rcutorture.gpwrap_lag_cycle_mins= [KNL] + Set the total cycle duration for gpwrap lag + testing in minutes. This is the total time for + one complete cycle of active and inactive + testing periods. Default is 30 minutes. + + rcutorture.gpwrap_lag_active_mins= [KNL] + Set the duration for which gpwrap lag is active + within each cycle, in minutes. During this time, + the grace-period wrap lag will be set to the + value specified by gpwrap_lag_gps. Default is + 5 minutes. + rcutorture.irqreader= [KNL] Run RCU readers from irq handlers, or, more accurately, from a timer handler. Not all RCU |