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scx_layered: Add helper function to access cpumask within bpf_cpumask

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Before passing "nodec->cpumas" and "cachec->cpumask" into
"bpf_cpumask_test_cpu()", type conversion should be done first.
Implement "cast_mask()" to convert "struct bpf_cpumask *" into "const
struct cpumask *".

Reference from
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/tools/testing/selftests/bpf/progs/cpumask_common.h#n63

Signed-off-by: I Hsin Cheng <richard120310@gmail.com>
This commit is contained in:
I Hsin Cheng 2024-09-19 22:36:29 +08:00
parent e4bb99efc5
commit 7799b94f07
1 changed files with 10 additions and 2 deletions
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12
scheds/rust/scx_layered/src/bpf/main.bpf.c
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@ -254,6 +254,14 @@ static struct cpumask *lookup_layer_cpumask(int idx)
}
}
/*
* Access a cpumask in read-only mode (typically to check bits).
*/
static const struct cpumask *cast_mask(struct bpf_cpumask *mask)
{
return (const struct cpumask *)mask;
}
static void refresh_cpumasks(int idx)
{
struct layer_cpumask_wrapper *cpumaskw;
@ -1313,12 +1321,12 @@ void BPF_STRUCT_OPS(layered_running, struct task_struct *p)
if (!(nodec = lookup_node_ctx(cctx->node_idx)))
return;
if (nodec->cpumask &&
!bpf_cpumask_test_cpu(tctx->last_cpu, nodec->cpumask))
!bpf_cpumask_test_cpu(tctx->last_cpu, cast_mask(nodec->cpumask)))
lstat_inc(LSTAT_XNUMA_MIGRATION, layer, cctx);
if (!(cachec = lookup_cache_ctx(cctx->cache_idx)))
return;
if (cachec->cpumask &&
!bpf_cpumask_test_cpu(tctx->last_cpu, cachec->cpumask))
!bpf_cpumask_test_cpu(tctx->last_cpu, cast_mask(cachec->cpumask)))
lstat_inc(LSTAT_XLLC_MIGRATION, layer, cctx);
}
tctx->last_cpu = task_cpu;