Hi,
Sorry forgot to read the entire sentence...
If you want to attribute this per-thread, it gets harder
and I don't think you can do this using the PMU, at least
not on x86. I believe you could do it on IA-64, though.
If you think major page fault may be a good approximation,
I believe you can retrieve this via /proc/PID/stat (fields 10,12)
or even top.
On Thu, Jun 11, 2009 at 5:43 PM, stephane eranian <eran...@googlemail.com>wrote:
> Hi,
> Can't you get Disk IO with a tool such as iostat or vmstat?
> $ iostat
> Linux 2.6.30-rc7-tip (quad) 06/11/09
>
> avg-cpu: %user %nice %system %iowait %steal %idle
> 0.16 0.00 0.43 0.03 0.00 99.38
>
> Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn
> sda 0.65 5.94 21.69 2224333 8127432
> sda1 0.65 5.93 21.69 2221820 8127432
> sda2 0.00 0.00 0.00 1021 0
> sda3 0.00 0.00 0.00 600 0
> sda4 0.00 0.00 0.00 636 0
>
>
> On Thu, Jun 11, 2009 at 6:35 AM, Andrej van der Zee <
> andrejvander...@gmail.com> wrote:
>
>> Hi,
>>
>> Thanks for your reply.
>>
>> >
>> > The performance monitoring hardware isn't going to determine whether it
>> is a
>> > major or minor page fault. The software needs to do some examination of
>> the data
>> > structures to determine whether a simple fix up of the data structure if
>> > required (minor) and an access to disk (major).
>> >
>>
>> Do you think it is feasible to hack this distinction between minor and
>> major page faults into perfmon2 without to much effort? I am not much
>> of a kernel programmer, so sorry if it is a silly question. But if it
>> is possible, I could delegate the work to one of my coworkers. I am
>> targeting for Intel Dual Core / Xeon CPUs.
>>
>> Thank you,
>> Andrej
>>
>>
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>
>
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