Re: [PATCH v6 16/18] perf: enable reading of perf.data files fromdifferent ABI rev

[David Ahern]

On 02/09/2012 03:21 PM, Stephane Eranian wrote:
> This patch allows perf to process perf.data files generated
> using an ABI that has a different perf_event_attr struct size, i.e.,
> a different ABI version.
> 
> The perf_event_attr can be extended, yet perf needs to cope with
> older perf.data files. Similarly, perf must be able to cope with
> a perf.data file which is using a newer version of the ABI than
> what it knows about.
> 
> This patch adds read_attr(), a routine that reads a perf_event_attr
> struct from a file incrementally based on its advertised size. If
> the on-file struct is smaller than what perf knows, then the extra
> fields are zeroed. If the on-file struct is bigger, then perf only
> uses what it knows about, the rest is skipped.
> 
> Signed-off-by: Stephane Eranian <eranian@xxxxxxxxxx>

Acked-by: David Ahern <dsahern@xxxxxxxxx>

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/