Re: [PATCH] Remove Powerpc OProfile events the kernel will reject
"Carl E. Love" <[email protected]>
| Newsgroups | gmane.linux.oprofile |
|---|---|
| Message-ID | <1448382535.5606.4.camel@oc3328482554> |
On Sat, 2015-11-21 at 17:58 -0600, 大平怜 wrote:
> Carl,
>
>
> Could you take a look at the question I asked in the previous email?
>
>
> > I have a question about your patch. Your patch removed
> > PM_DATA_ALL_FROM_RL2L3_MOD, but this event does not
> > cause any error when I specify it to a previous version of OProfile.
> > Why does your patch have to remove this event? Maybe it depends
> > on the environment? I confirmed PM_L2_LD_MISS did cause an error,
> > as Chencheng Ye found. I have not yet checked the other events.
>
The event code for PM_DATA_ALL_FROM_RL2L3_MOD is 0x62c046. Bits 22:20
are 2. According to the note 1 in the patch the kernel will reject any
event with non zero bits in 22:20. Hence it was included. I tried the
event on my Power 8 machine:
ocount -e PM_DATA_ALL_FROM_RL2L3_MOD ls
Cannot find event PM_DATA_ALL_FROM_RL2L3_MOD
Error retrieving info for event PM_DATA_ALL_FROM_RL2L3_MOD
and it was rejected.
I have not tracked down exactly when the change went into the kernel. I
have 3.13.0-35 on my Ubuntu 14.04 system. What distro/kernel version
are you running?
Carl Love
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