[BUG] perf failed on multi-cpus system with multi-events specified

[Han Pingtian <phan@redhat.com>]

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.
-- 
Han Pingtian
Quality Engineer
hpt @ #kernel-qe
Red Hat, Inc
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