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perf_event_open.2: Minor tweaks to Vince Weaver's patch 

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Michael Kerrisk 2016-10-19 08:59:31 +02:00
parent 9277a75d39
commit d5a24378f9
1 changed files with 12 additions and 10 deletions
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22
man2/perf_event_open.2
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@ -1120,10 +1120,10 @@ This enables the generation of
records when a context switch occurs.
It also enables the generation of
.B PERF_RECORD_SWITCH_CPU_WIDE
records when sampling in cpu-wide mode.
records when sampling in CPU-wide mode.
This functionality is in addition to existing tracepoint and
software events for measuring context switches.
The advantage of this method is that it will give full
The advantage of this method is that it will give a full
information event with strict
.I perf_event_paranoid
settings.
@ -1808,8 +1808,8 @@ Sample happened in guest user code.
.RE
.RS
The following three statuses are generated by
different record types so they alias to the same bit:
Since the following three statuses are generated by
different record types, they alias to the same bit:
.TP
.BR PERF_RECORD_MISC_MMAP_DATA " (since Linux 3.10)"
.\" commit 2fe85427e3bf65d791700d065132772fc26e4d75
@ -1828,10 +1828,12 @@ system call.
.BR PERF_RECORD_MISC_SWITCH_OUT " (since Linux 4.3)"
.\" commit 45ac1403f564f411c6a383a2448688ba8dd705a4
When a
.BR PERF_RECORD_SWITCH " or " PERF_RECORD_SWITCH_CPU_WIDE
record is generated this bit indicates that the
.BR PERF_RECORD_SWITCH
or
.BR PERF_RECORD_SWITCH_CPU_WIDE
record is generated, this bit indicates that the
context switch is away from the current process
(instead of in to the current process).
(instead of into the current process).
.RE
.RS
@ -2633,7 +2635,7 @@ struct {
As with
.B PERF_RECORD_SWITCH
this record indicates a context switch has happened,
but it only occurs when sampling in cpu-wide mode
but it only occurs when sampling in CPU-wide mode
and provides additional information on the process
being switched to/from.
The
@ -2655,11 +2657,11 @@ struct {
.RS
.TP
.I next_prev_pid
The process id of the previous (if switching in)
The process ID of the previous (if switching in)
or next (if switching out) process on the CPU.
.TP
.I next_prev_tid
The thread id of the previous (if switching in)
The thread ID of the previous (if switching in)
or next (if switching out) thread on the CPU.
.RE
.RE