linux/kernel/rcu/refscale.c, branch v6.16

refscale: Add srcu_read_lock_fast() support using "srcu-fast"

2025-02-05T15:12:05Z

This commit creates a new srcu-fast option for the refscale.scale_type module parameter that selects srcu_read_lock_fast() and srcu_read_unlock_fast(). Signed-off-by: Paul E. McKenney Cc: Alexei Starovoitov Cc: Andrii Nakryiko Cc: Peter Zijlstra Cc: Kent Overstreet Cc: Signed-off-by: Boqun Feng

refscale: Add test for sched_clock()

2024-12-14T15:16:33Z

This commit adds a "sched-clock" test for the sched_clock() function. Signed-off-by: Paul E. McKenney Signed-off-by: Frederic Weisbecker Signed-off-by: Uladzislau Rezki (Sony)

Merge branches 'rcu/fixes', 'rcu/nocb', 'rcu/torture', 'rcu/stall' and 'rcu/srcu' into rcu/dev

2024-11-15T21:38:53Z

rcuscale: Add guest_os_delay module parameter

2024-11-12T22:05:05Z

This commit adds a guest_os_delay module parameter that extends warm-up and cool-down the specified number of seconds before and after the series of test runs. This allows the data-collection intervals from any given rcuscale guest OSes to line up with active periods in the other rcuscale guest OSes, and also allows the thermal warm-up period required to obtain consistent results from one test to the next. Signed-off-by: Paul E. McKenney Reviewed-by: Neeraj Upadhyay Signed-off-by: Frederic Weisbecker

refscale: Correct affinity check

2024-11-12T22:04:50Z

The current affinity check works fine until there are more reader processes than CPUs, at which point the affinity check is looking for non-existent CPUs. This commit therefore applies the same modulus to the check as is present in the set_cpus_allowed_ptr() call. Signed-off-by: Paul E. McKenney Reviewed-by: Neeraj Upadhyay Signed-off-by: Frederic Weisbecker

refscale: Add srcu_read_lock_lite() support using "srcu-lite"

2024-11-12T14:45:02Z

This commit creates a new srcu-lite option for the refscale.scale_type module parameter that selects srcu_read_lock_lite() and srcu_read_unlock_lite(). [ paulmck: Apply Dan Carpenter feedback. ] Signed-off-by: Paul E. McKenney Cc: Alexei Starovoitov Cc: Andrii Nakryiko Cc: Peter Zijlstra Cc: Kent Overstreet Cc: Reviewed-by: Neeraj Upadhyay Signed-off-by: Frederic Weisbecker

refscale: Constify struct ref_scale_ops

2024-08-14T18:44:48Z

'struct ref_scale_ops' are not modified in these drivers. Constifying this structure moves some data to a read-only section, so increase overall security. On a x86_64, with allmodconfig: Before: ====== text data bss dec hex filename 34231 4167 736 39134 98de kernel/rcu/refscale.o After: ===== text data bss dec hex filename 35175 3239 736 39150 98ee kernel/rcu/refscale.o Signed-off-by: Christophe JAILLET Tested-by: "Paul E. McKenney" Signed-off-by: Neeraj Upadhyay

refscale: Optimize process_durations()

2024-08-14T11:36:01Z

process_durations() is not a hot path, but there is no good reason to iterate over and over the data already in 'buf'. Using a seq_buf saves some useless strcat() and the need of a temp buffer. Data is written directly at the correct place. Signed-off-by: Christophe JAILLET Tested-by: "Paul E. McKenney" Reviewed-by: Davidlohr Bueso Signed-off-by: Neeraj Upadhyay

rcutorture: Add missing MODULE_DESCRIPTION() macros

2024-06-06T18:44:42Z

Fix the following 'make W=1' warnings: WARNING: modpost: missing MODULE_DESCRIPTION() in kernel/rcu/rcutorture.o WARNING: modpost: missing MODULE_DESCRIPTION() in kernel/rcu/rcuscale.o WARNING: modpost: missing MODULE_DESCRIPTION() in kernel/rcu/refscale.o Signed-off-by: Jeff Johnson Signed-off-by: Paul E. McKenney

refscale: Print out additional module parameters

2023-09-11T21:02:18Z

The refscale.verbose_batched and refscale.lookup_instances module parameters are omitted from the ref_scale_print_module_parms() beginning-of-test output. This commit therefore adds them. Signed-off-by: Paul E. McKenney Signed-off-by: Frederic Weisbecker