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scx_rusty: fix stats map initialization

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The stats map in scx_rusty is a BPF_MAP_TYPE_PERCPU_ARRAY, with its size
determined by num_possible_cpus(). Initializing it with nr_cpu_ids() can
result in errors such as:

 Error: Failed to zero stat

 Caused by:
     number of values 6 != number of cpus 8

Fix by using num_possible_cpus() to initialize it.

Fixes: 263e02f6 ("rusty: Use nr_cpu_ids instead of nr_cpus_possible")
Signed-off-by: Andrea Righi <andrea.righi@canonical.com>
This commit is contained in:
Andrea Righi 2024-06-30 17:35:04 +02:00
parent 14a33b6275
commit d76551bbd3
1 changed files with 1 additions and 1 deletions
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2
scheds/rust/scx_rusty/src/main.rs
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@ -485,7 +485,7 @@ impl<'a> Scheduler<'a> {
let stats_map = maps.stats();
let mut stats: Vec<u64> = Vec::new();
let zero_vec =
vec![vec![0u8; stats_map.value_size() as usize]; self.top.nr_cpu_ids()];
vec![vec![0u8; stats_map.value_size() as usize]; self.top.nr_cpus_possible()];
for stat in 0..bpf_intf::stat_idx_RUSTY_NR_STATS {
let cpu_stat_vec = stats_map