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    SubjectRe: [BUG] perf failed on multi-cpus system with multi-events specified
    On Wed, Mar 02, 2011 at 05:35:30AM +0100, Eric Dumazet wrote:
    > 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
    It works. Thanks!
    >
    >

    --
    Han Pingtian
    Quality Engineer
    hpt @ #kernel-qe
    Red Hat, Inc
    Freedom ... courage ... Commitment ... ACCOUNTABILITY
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