Hi Pawel,
On Tue, 4 Nov 2014 00:28:37 +0000, Pawel Moll wrote:
> + /*
> + * Data in userspace event record is transparent for the kernel
> + *
> + * Userspace perf tool code maintains a list of known types with
> + * reference implementations of parsers for the data field.
> + *
> + * Overall size of the record (including type and size fields)
> + * is always aligned to 8 bytes by adding padding after the data.
> + *
> + * struct {
> + * struct perf_event_header header;
> + * u32 type;
> + * u32 size;
The struct perf_event_header also has 'size' field and it has the entire
length of the record so it's redundant. Also there's 'misc' field in the
perf_event_header and I guess it can be used as 'type' info as it's
mostly for cpumode and we are in user mode by definition.
Thanks,
Namhyung
> + * char data[size];
> + * char __padding[-size & 7];
> + * struct sample_id sample_id;
> + * };
> + */
> + PERF_RECORD_UEVENT = 11,
> +
> PERF_RECORD_MAX, /* non-ABI */
> };
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