From 2f8d489897ae7183b535b1881478b2c6b66d520b Mon Sep 17 00:00:00 2001 From: George Guo Date: Sat, 10 Jan 2026 00:12:14 +0800 Subject: [PATCH] sched_ext: Add error logging for dsq creation failures Add scx_bpf_error() calls when scx_bpf_create_dsq() fails in multiple schedulers to improve debuggability: - scx_central.bpf.c: central_init() - scx_flatcg.bpf.c: fcg_cgroup_init() and fcg_init() - scx_qmap.bpf.c: qmap_init() Signed-off-by: George Guo Signed-off-by: Tejun Heo --- tools/sched_ext/scx_central.bpf.c | 4 +++- tools/sched_ext/scx_flatcg.bpf.c | 4 +++- tools/sched_ext/scx_qmap.bpf.c | 8 ++++++-- 3 files changed, 12 insertions(+), 4 deletions(-) diff --git a/tools/sched_ext/scx_central.bpf.c b/tools/sched_ext/scx_central.bpf.c index 55df8b7988657..1c2376b75b5d0 100644 --- a/tools/sched_ext/scx_central.bpf.c +++ b/tools/sched_ext/scx_central.bpf.c @@ -301,8 +301,10 @@ int BPF_STRUCT_OPS_SLEEPABLE(central_init) int ret; ret = scx_bpf_create_dsq(FALLBACK_DSQ_ID, -1); - if (ret) + if (ret) { + scx_bpf_error("scx_bpf_create_dsq failed (%d)", ret); return ret; + } timer = bpf_map_lookup_elem(¢ral_timer, &key); if (!timer) diff --git a/tools/sched_ext/scx_flatcg.bpf.c b/tools/sched_ext/scx_flatcg.bpf.c index 43126858b8e4c..c216480c3ee05 100644 --- a/tools/sched_ext/scx_flatcg.bpf.c +++ b/tools/sched_ext/scx_flatcg.bpf.c @@ -842,8 +842,10 @@ int BPF_STRUCT_OPS_SLEEPABLE(fcg_cgroup_init, struct cgroup *cgrp, * unlikely case that it breaks. */ ret = scx_bpf_create_dsq(cgid, -1); - if (ret) + if (ret) { + scx_bpf_error("scx_bpf_create_dsq failed (%d)", ret); return ret; + } cgc = bpf_cgrp_storage_get(&cgrp_ctx, cgrp, 0, BPF_LOCAL_STORAGE_GET_F_CREATE); diff --git a/tools/sched_ext/scx_qmap.bpf.c b/tools/sched_ext/scx_qmap.bpf.c index df21fad0c4381..d51d8c38f1cf9 100644 --- a/tools/sched_ext/scx_qmap.bpf.c +++ b/tools/sched_ext/scx_qmap.bpf.c @@ -866,12 +866,16 @@ s32 BPF_STRUCT_OPS_SLEEPABLE(qmap_init) print_cpus(); ret = scx_bpf_create_dsq(SHARED_DSQ, -1); - if (ret) + if (ret) { + scx_bpf_error("failed to create DSQ %d (%d)", SHARED_DSQ, ret); return ret; + } ret = scx_bpf_create_dsq(HIGHPRI_DSQ, -1); - if (ret) + if (ret) { + scx_bpf_error("failed to create DSQ %d (%d)", HIGHPRI_DSQ, ret); return ret; + } timer = bpf_map_lookup_elem(&monitor_timer, &key); if (!timer) -- 2.47.3