Re: perf record: mmap fails when specifying process/thread

[David Ahern <dsahern@gmail.com>]

On 02/16/11 16:53, Arnaldo Carvalho de Melo wrote:
> Em Wed, Feb 16, 2011 at 08:43:45AM -0700, David Ahern escreveu:
>> Latest perf-core (pulled 5 minutes ago):
>>
>> # ps -C sshd
>>   PID TTY          TIME CMD
>>   961 ?        00:00:00 sshd
>>  1042 ?        00:00:00 sshd
>>
>> # /tmp/build-perf/perf record -v -fo/tmp/perf.data -p 1042
>>   Warning:  ... trying to fall back to cpu-clock-ticks
>>
>>   Fatal: failed to mmap with 22 (Invalid argument)
>>
>>
>> It works fine with -a argument and when a command is given, but fails
>> with the -p or -t argument.
> 
> In my radar, perf/urgent works tho, kinda made me lazy due to compound with
> unrelated company work :-\ Need to fix that ASAP.
> 
> - Arnaldo

Works in latest kernel git too. I looked at a diff of the tools between
the kernel tree and perf-core -- too many changes for me to wade through
right now.

BTW, it fails running the Fedora 14 kernel too, so my guess is a
userspace change.

David