diff options
| 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 /kernel/rcu/rcu.h | |
| parent | 7e01c4c5cff293627209bac4337b1971b2f57d4e (diff) | |
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 'kernel/rcu/rcu.h')
| -rw-r--r-- | kernel/rcu/rcu.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/kernel/rcu/rcu.h b/kernel/rcu/rcu.h index eed2951a4962..516b26024a37 100644 --- a/kernel/rcu/rcu.h +++ b/kernel/rcu/rcu.h @@ -572,6 +572,8 @@ void do_trace_rcu_torture_read(const char *rcutorturename, unsigned long c_old, unsigned long c); void rcu_gp_set_torture_wait(int duration); +void rcu_set_gpwrap_lag(unsigned long lag); +int rcu_get_gpwrap_count(int cpu); #else static inline void rcutorture_get_gp_data(int *flags, unsigned long *gp_seq) { @@ -589,6 +591,8 @@ void do_trace_rcu_torture_read(const char *rcutorturename, do { } while (0) #endif static inline void rcu_gp_set_torture_wait(int duration) { } +static inline void rcu_set_gpwrap_lag(unsigned long lag) { } +static inline int rcu_get_gpwrap_count(int cpu) { return 0; } #endif unsigned long long rcutorture_gather_gp_seqs(void); void rcutorture_format_gp_seqs(unsigned long long seqs, char *cp, size_t len); |