.\" commit d6be9ad6c960f43800a6f118932bc8a5a4eadcd1
Records the data source: where in the memory hierarchy
the data associated with the sampled instruction came from.
-This is only available if the underlying hardware
+This is available only if the underlying hardware
supports this feature.
.TP
.BR PERF_SAMPLE_IDENTIFIER " (since Linux 3.12)"
bit flag.
.I wakeup_events
-only counts
+counts only
.B PERF_RECORD_SAMPLE
record types.
To receive overflow notification for all
An unsigned 64-bit value containing the counter result.
.TP
.I id
-A globally unique value for this particular event, only there if
+A globally unique value for this particular event, only present if
.B PERF_FORMAT_ID
was specified in
.IR read_format .
.BR fcntl (2)
to generate SIGIO signals.
-Overflows are only generated by sampling events
+Overflows are generated only by sampling events
.RI ( sample_period
must have a nonzero value).
file can be set to restrict access to the performance counters.
.RS
.IP 2 4
-only allow user-space measurements.
+allow only user-space measurements.
.IP 1
allow both kernel and user measurements (default).
.IP 0