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MINOR: cpu-topo: add a function to dump CPU topology

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The new function cpu_dump_topology() will centralize most debugging
calls, and it can make efforts of not dumping some possibly irrelevant
fields (e.g. non-existing cache levels).
This commit is contained in:
Willy Tarreau 2025-01-23 18:00:51 +01:00
parent 041462c4af
commit bdb731172c
2 changed files with 53 additions and 0 deletions
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5
include/haproxy/cpu_topo.h
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@ -9,4 +9,9 @@ extern int cpu_topo_maxcpus;
extern int cpu_topo_lastcpu;
extern struct ha_cpu_topo *ha_cpu_topo;
/* Dump the CPU topology <topo> for up to cpu_topo_maxcpus CPUs for
* debugging purposes. Offline CPUs are skipped.
*/
void cpu_dump_topology(const struct ha_cpu_topo *topo);
#endif /* _HAPROXY_CPU_TOPO_H */

48
src/cpu_topo.c
View File

@ -9,6 +9,54 @@ int cpu_topo_maxcpus = -1; // max number of CPUs supported by OS/haproxy
int cpu_topo_lastcpu = -1; // last supposed online CPU (no need to look beyond)
struct ha_cpu_topo *ha_cpu_topo = NULL;
/* Dump the CPU topology <topo> for up to cpu_topo_maxcpus CPUs for
* debugging purposes. Offline CPUs are skipped.
*/
void cpu_dump_topology(const struct ha_cpu_topo *topo)
{
int has_smt = 0;
int cpu, lvl;
for (cpu = 0; cpu <= cpu_topo_lastcpu; cpu++)
if (ha_cpu_topo[cpu].th_cnt > 1)
has_smt = 1;
for (cpu = 0; cpu <= cpu_topo_lastcpu; cpu++) {
if (ha_cpu_topo[cpu].st & HA_CPU_F_OFFLINE)
continue;
printf("%3d: cpu=%3d excl=%d pk=%02d no=%02d cl=%03d(%03d)",
cpu, ha_cpu_topo[cpu].idx,
(ha_cpu_topo[cpu].st & HA_CPU_F_EXCL_MASK),
ha_cpu_topo[cpu].pk_id,
ha_cpu_topo[cpu].no_id,
ha_cpu_topo[cpu].cl_gid,
ha_cpu_topo[cpu].cl_lid);
/* list only relevant cache levels */
for (lvl = 4; lvl >= 0; lvl--) {
if (ha_cpu_topo[cpu].ca_id[lvl] < 0)
continue;
printf(lvl < 3 ? " l%d=%02d" : " l%d=%03d", lvl, ha_cpu_topo[cpu].ca_id[lvl]);
}
printf(" ts=%03d capa=%d",
ha_cpu_topo[cpu].ts_id,
ha_cpu_topo[cpu].capa);
if (has_smt) {
if (ha_cpu_topo[cpu].th_cnt > 1)
printf(" smt=%d/%d",
ha_cpu_topo[cpu].th_id,
ha_cpu_topo[cpu].th_cnt);
else
printf(" smt=%d",
ha_cpu_topo[cpu].th_cnt);
}
putchar('\n');
}
}
/* returns an optimal maxcpus for the current system. It will take into
* account what is reported by the OS, if any, otherwise will fall back
* to the cpuset size, which serves as an upper limit in any case.