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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 20 Dec 2024 06:35:04.5538 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: cb04f288-c9b0-42a0-f69a-08dd20c07057 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: SJ1PEPF00001CE4.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ1PR12MB6049 Content-Type: text/plain; charset="utf-8" From: K Prateek Nayak Currently, there does not exist a straightforward way to extract the names of the sched domains and match them to the per-cpu domain entry in /proc/schedstat other than looking at the debugfs files which are only visible after enabling "verbose" debug after commit 34320745dfc9 ("sched/debug: Put sched/domains files under the verbose flag") Since tools like `perf sched stats`[1] require displaying per-domain information in user friendly manner, display the names of sched domain, alongside their level in /proc/schedstat. Domain names also makes the /proc/schedstat data unambiguous when some of the cpus are offline. For example, on a 128 cpus AMD Zen3 machine where CPU0 and CPU64 are SMT siblings and CPU64 is offline: Before: cpu0 ... domain0 ... domain1 ... cpu1 ... domain0 ... domain1 ... domain2 ... After: cpu0 ... domain0 MC ... domain1 PKG ... cpu1 ... domain0 SMT ... domain1 MC ... domain2 PKG ... [1] https://lore.kernel.org/lkml/20241122084452.1064968-1-swapnil.sapkal@am= d.com/ Signed-off-by: K Prateek Nayak Signed-off-by: Ravi Bangoria Signed-off-by: Swapnil Sapkal Tested-by: James Clark --- kernel/sched/stats.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/sched/stats.c b/kernel/sched/stats.c index 802bd9398a2e..5f563965976c 100644 --- a/kernel/sched/stats.c +++ b/kernel/sched/stats.c @@ -138,7 +138,7 @@ static int show_schedstat(struct seq_file *seq, void *v) for_each_domain(cpu, sd) { enum cpu_idle_type itype; =20 - seq_printf(seq, "domain%d %*pb", dcount++, + seq_printf(seq, "domain%d %s %*pb", dcount++, sd->name, cpumask_pr_args(sched_domain_span(sd))); for (itype =3D 0; itype < CPU_MAX_IDLE_TYPES; itype++) { seq_printf(seq, " %u %u %u %u %u %u %u %u %u %u %u", --=20 2.43.0