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scftorture: Allow zero weight to exclude an smp_call_function*() category 

This commit reworks the weighting calculations to allow zero to
be specified to disable a given weight.  For example, specifying the
scftorture.weight_resched=0 kernel boot parameter without specifying a
non-zero value for any of the other scftorture.weight_* parameters would
provide the default weights for the others, but would refrain from doing
any resched-based IPIs.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Paul E. McKenney 2021-07-13 14:12:54 -07:00
parent 6880fa6c56
commit 2f611d044b
1 changed files with 12 additions and 12 deletions
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24
kernel/scftorture.c
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@ -553,18 +553,18 @@ static int __init scf_torture_init(void)
scftorture_print_module_parms("Start of test");
if (weight_resched == -1 &&
weight_single == -1 && weight_single_rpc == -1 && weight_single_wait == -1 &&
weight_many == -1 && weight_many_wait == -1 &&
weight_all == -1 && weight_all_wait == -1) {
weight_resched1 = 2 * nr_cpu_ids;
weight_single1 = 2 * nr_cpu_ids;
weight_single_rpc1 = 2 * nr_cpu_ids;
weight_single_wait1 = 2 * nr_cpu_ids;
weight_many1 = 2;
weight_many_wait1 = 2;
weight_all1 = 1;
weight_all_wait1 = 1;
if (weight_resched <= 0 &&
weight_single <= 0 && weight_single_rpc <= 0 && weight_single_wait <= 0 &&
weight_many <= 0 && weight_many_wait <= 0 &&
weight_all <= 0 && weight_all_wait <= 0) {
weight_resched1 = weight_resched == 0 ? 0 : 2 * nr_cpu_ids;
weight_single1 = weight_single == 0 ? 0 : 2 * nr_cpu_ids;
weight_single_rpc1 = weight_single_rpc == 0 ? 0 : 2 * nr_cpu_ids;
weight_single_wait1 = weight_single_wait == 0 ? 0 : 2 * nr_cpu_ids;
weight_many1 = weight_many == 0 ? 0 : 2;
weight_many_wait1 = weight_many_wait == 0 ? 0 : 2;
weight_all1 = weight_all == 0 ? 0 : 1;
weight_all_wait1 = weight_all_wait == 0 ? 0 : 1;
} else {
if (weight_resched == -1)
weight_resched1 = 0;