linux-kernel - Re: [BUG] perf failed on multi-cpus system with multi-events specified

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Date:	Wed, 02 Mar 2011 05:35:30 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Han Pingtian <phan@...hat.com>
Cc:	linux-kernel@...r.kernel.org,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: [BUG] perf failed on multi-cpus system with multi-events
 specified

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@...el-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@...el-s3e36-01 perf]# ./perf --version
> perf version 2.6.38.rc6.166.g493f33
> [root@...el-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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