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X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 02 Jun 2025 15:13:45.3572 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 6b8c78e2-5acd-4620-0827-08dda1e8117e X-MS-Exchange-CrossTenant-Id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=f34e5979-57d9-4aaa-ad4d-b122a662184d;Ip=[4.158.2.129];Helo=[outbound-uk1.az.dlp.m.darktrace.com] X-MS-Exchange-CrossTenant-AuthSource: AMS1EPF0000004D.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PAVPR08MB8896 Hi David, > > > Before I start testing, I feel concerned about following chain: > > > > > > ./kernel/fork.c: > > > bad_fork_cleanup_perf: > > > perf_event_free_task() > > > perf_free_event() > > > list_del_event() > > > > > > This patch seems changes the behavior in this callchain. > > > Would this have other side-effect? > > > > What behavior is changed you're worry about? > > both error patch is handled by __perf_remove_from_context(), > > There wouldn't be no problem since this patch just move the > > time of disabling cgroup before changing event state. > > > > also, the cgroup event is for only cpuctx not added in taskctx. > > So, there's no effect for event attached in taskctx. > > > > Thanks. > > Am I reading it wrong? > The call chain I mentioned above dose not walk through __perf_remove_from_context, > It is a fail path in fork, which happens rarely, but still possible. I guess... Since commit 90661365021a ("perf Unify perf_event_free_task() / perf_evenet_exit_task_context()") perf_event_free_task() is integrated with perf_event_exit_task_context() So, it calls __perf_remove_from_context(). In v6.15, I think you can test with below change only: @@ -2471,6 +2459,16 @@ __perf_remove_from_context(struct perf_event *event, ctx_time_update(cpuctx, ctx); + /* + * If event was in error state, then keep it + * that way, otherwise bogus counts will be + * returned on read(). The only way to get out + * of error state is by explicit re-enabling + * of the event + */ + if (event->state > PERF_EVENT_STATE_OFF) + perf_cgroup_event_disable(event, ctx); + /* * Ensure event_sched_out() switches to OFF, at the very least * this avoids raising perf_pending_task() at this time. not with modification with "list_del_event()". Thanks -- Sincerely, Yeoreum Yun