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SubjectRe: [BUG] perf failed on multi-cpus system with multi-events specified
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Le mercredi 02 mars 2011 à 11:58 +0800, Han Pingtian a écrit :
> Hi,
>
> On a Nehalem-EX system, which has 24 CPUs, perf commands with
> multi-events specified fail:
>
> [root@intel-s3e36-01 perf]# ./perf record -e
> syscalls:sys_enter_sched_get_priority_min -e kmem:mm_kernel_pagefault
> -e workqueue:workqueue_execution -e writeback:writeback_pages_written
> -e kmem:mm_kernel_pagefault -e writeback:writeback_bdi_unregister -e
> syscalls:sys_exit_capset -e syscalls:sys_enter_sched_get_priority_min
> -e writeback:writeback_exec -e syscalls:sys_enter_vmsplice -e
> syscalls:sys_exit_mprotect -e block:block_rq_complete -e
> syscalls:sys_enter_readlinkat -e signal:signal_overflow_fail -e
> syscalls:sys_exit_sendfile64 -e block:block_bio_backmerge -e
> syscalls:sys_exit_unlink -e syscalls:sys_exit_keyctl -e
> jbd2:jbd2_submit_inode_data -e syscalls:sys_enter_tgkill -e
> syscalls:sys_exit_lremovexattr -e syscalls:sys_exit_munmap -e
> syscalls:sys_enter_mmap -e syscalls:sys_exit_sched_getparam -e
> syscalls:sys_exit_getpgid -e syscalls:sys_exit_clock_getres -e
> block:block_split -e ext4:ext4_mballoc_discard -e task-clock -e
> syscalls:sys_enter_sendfile64 -e syscalls:sys_enter_ptrace -e
> syscalls:sys_enter_nanosleep -e syscalls:sys_exit_setdomainname -e
> writeback:writeback_nowork -e syscalls:sys_exit_mbind -e
> ext4:ext4_da_write_begin -e syscalls:sys_enter_recvfrom -e
> syscalls:sys_enter_write -e syscalls:sys_exit_getresgid -e
> syscalls:sys_exit_fsync -e syscalls:sys_enter_rt_sigprocmask -e
> syscalls:sys_enter_getdents -e syscalls:sys_exit_semtimedop -f ls
>
> Error: sys_perf_event_open() syscall returned with -1 (Too many open
> files). /bin/dmesg may provide additional information.
>
> Fatal: No CONFIG_PERF_EVENTS=y kernel support configured?
>
> trace-cmd: Too many open files
> No memory to alloc tracepoints list
> [root@intel-s3e36-01 perf]# ./perf --version
> perf version 2.6.38.rc6.166.g493f33
> [root@intel-s3e36-01 perf]#
>
> On another latop which has only two CPUs, there is no this problem.

perf needs nr_cpus * nr_events file descriptors

Try before :

ulimit -n 1000000



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