From 65612369e71726aa6bc7afdc48774bf170fb709f Mon Sep 17 00:00:00 2001
From: Willy Tarreau <w@1wt.eu>
Date: Wed, 8 Jan 2025 17:55:10 +0100
Subject: [PATCH] MINOR: cpu-topo: also store the sibling ID with SMT

The sibling ID was not reported because it's not directly accessible
but we don't care, what matters is that we assign numbers to all the
threads we find using the same CPU so that some strategies permit to
allocate one thread at a time if we want to use few threads with max
performance.
---
 src/cpu_topo.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/cpu_topo.c b/src/cpu_topo.c
index 9166c1195..b1a131021 100644
--- a/src/cpu_topo.c
+++ b/src/cpu_topo.c
@@ -298,11 +298,14 @@ int cpu_detect_topology(void)
 			parse_cpu_set_args[0] = trash.area;
 			parse_cpu_set_args[1] = "\0";
 			if (parse_cpu_set(parse_cpu_set_args, &cpus_list, NULL) == 0) {
+				int sib_id = 0;
+
 				cpu_id.th_cnt = ha_cpuset_count(&cpus_list);
 				for (cpu2 = 0; cpu2 <= cpu_topo_lastcpu; cpu2++) {
 					if (ha_cpuset_isset(&cpus_list, cpu2)) {
 						ha_cpu_topo[cpu2].ts_id  = cpu_id.ts_id;
 						ha_cpu_topo[cpu2].th_cnt = cpu_id.th_cnt;
+						ha_cpu_topo[cpu2].th_id  = sib_id++;
 					}
 				}
 				cpu_id.ts_id++;