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b/include/trace/events/sched.h >> @@ -745,6 +745,37 @@ TRACE_EVENT(sched_skip_vma_numa, >> __entry->vm_end, >> __print_symbolic(__entry->reason, NUMAB_SKIP_REASON)) >> ); >> + >> +TRACE_EVENT(sched_skip_cpuset_numa, >> + >> + TP_PROTO(struct task_struct *tsk, nodemask_t *mem_allowed_ptr), >> + >> + TP_ARGS(tsk, mem_allowed_ptr), >> + >> + TP_STRUCT__entry( >> + __array( char, comm, TASK_COMM_LEN ) >> + __field( pid_t, pid ) >> + __field( pid_t, tgid ) >> + __field( pid_t, ngid ) >> + __array( unsigned long, mem_allowed, BITS_TO_LONGS(MAX_NUMNODES)) >> + ), >> + >> + TP_fast_assign( >> + memcpy(__entry->comm, tsk->comm, TASK_COMM_LEN); >> + __entry->pid = task_pid_nr(tsk); >> + __entry->tgid = task_tgid_nr(tsk); >> + __entry->ngid = task_numa_group_id(tsk); >> + memcpy(__entry->mem_allowed, mem_allowed_ptr->bits, >> + sizeof(__entry->mem_allowed)); > > Is mem_allowed->bits guaranteed to be the size of BITS_TO_LONGS(MAX_NUM_NODES) > in size? If not, then memcpy will read beyond that size. > Yes, evidence can be found in the definitions of nodemask_t and DECLARE_BITMAP: // include/linux/nodemask_types.h typedef struct { DECLARE_BITMAP(bits, MAX_NUMNODES); } nodemask_t; // include/linux/types.h #define DECLARE_BITMAP(name,bits) \ unsigned long name[BITS_TO_LONGS(bits)] Thanks, Libo > -- Steve > > >> + ), >> + >> + TP_printk("comm=%s pid=%d tgid=%d ngid=%d mem_nodes_allowed=%*pbl", >> + __entry->comm, >> + __entry->pid, >> + __entry->tgid, >> + __entry->ngid, >> + MAX_NUMNODES, __entry->mem_allowed) >> +); >