On Tue, May 4, 2010 at 11:44 PM, Corey Ashford
<[email protected]> wrote:
> Almost perfect. It worked correctly for the first test cases I tried, and
> there's a nice touch on the print that separates groups (I like it!).
> However, when I tried adding the -f switch, just to see what would happen, I
> get this:
>
> % ./task -f -e PM_RUN_CYC,PM_CYC -e
> PM_RUN_CYC,PM_FXU_IDLE,PM_CYC,PM_CYC,PM_CYC md5sum `which gdb`
> 825b15d7279ef21d6c9d018d775758ae /usr/bin/gdb
> task: could not read event 0, tried to read 40 bytes, but got 32
> task: cannot read values event PM_RUN_CYC: No space left on device
>
If you run strace, I am sure would will see that ENOSPACE is coming
from the kernel, i.e., read().
Could be that the read buffer is too small.
> From the source code, it looks like maybe the .name string is not getting
> terminated properly, and that ": No space left on device" is left over from
> some other call.
>
> This wouldn't explain the error, but the fds index being used on
> perf_utilc.s:105 isn't right:
> ret = read(fds[evt].fd, values, sz);
> if (ret != sz) { /* unsigned */
> if (ret == -1)
> err(1, "cannot read values event %s",
> fds[0].name);
>
> That should be fds[evt].name
>
Yes, will fix that.
> Any idea how the string terminator may be getting stomped on?
>
I doubt think this is the problem.
>
> - Corey
>
>
> On 5/4/2010 2:21 PM, stephane eranian wrote:
>> On Tue, May 4, 2010 at 11:17 PM, Corey Ashford
>> <[email protected]> wrote:
>>>
>>>
>>> On 5/4/2010 2:13 PM, stephane eranian wrote:
>>>> Corey,
>>>>
>>>> I have not yet pushed the patch, I wanted to get your opinion first.
>>>
>>> Push away! it looks good to me.
>>>
>> Done, try now.
>> Thanks for your contribution.
>>
>>> Thanks,
>>>
>>> - Corey
>>>
>>>
>
> --
> Regards,
>
> - Corey
>
> Corey Ashford
> Software Engineer
> IBM Linux Technology Center, Linux Toolchain
> Beaverton, OR
> 503-578-3507
> [email protected]
>
>
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