[RFC PATCH] perf: align raw sample data on 64-bit boundaries

[Robert Richter]

On 19.04.10 14:19:57, Stephane Eranian wrote:
> > +       perf_sample_data_init(&data, 0);
> > +       if (event->attr.sample_type & PERF_SAMPLE_RAW) {
> > +               for (i = 1; i < size; i++)
> > +                       rdmsrl(msr++, *buf++);
> > +               raw.size = sizeof(u64) * size;
> > +               raw.data = buffer;
> > +               data.raw = &raw;
> > +       }
> > +
> 
> Need to add the padding: raw.size = sizeof(u64) * size + sizeof(u32);

When thinking about this I was wondering if it wouldn't make sense to
better fix the alignment and move the data buffer to a 64 bit
boundary. So take a look at the enclosed RFC patch. Though it breaks
the ABI it would solve some problems. I think more than it introduces.
Hopefully I found all effected code locations using it.

-Robert

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