Re: [RFC 2/2] perf: Marker software event and ioctl
From: Pawel Moll <hidden>
Date: 2014-09-12 13:59:07
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On Fri, 2014-09-12 at 14:49 +0100, Arnaldo Carvalho de Melo wrote:
Perhaps both? I.e. an u64 followed from a string, if the u64 is zero, then there is a string right after it?
How would this look like in userspace? Something like this?
8<----
struct perf_event_marker {
uint64_t value;
char *string;
} arg;
arg.value = 0x1234;
/* or */
arg.value = 0;
arg.string = "abcd";
ioctl(fd, PERF_EVENT_IOC_MARKER, &arg)
8<----
If so, maybe it would simpler just to go for classic size/data
structure?
8<-----
struct perf_event_marker {
uint32_t size;
void *data;
}
8<-----
This would directly map into struct perf_raw_record...
Paweł