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prctl.2: Add PR_TASK_PERF_EVENTS_DISABLE and PR_TASK_PERF_EVENTS_ENABLE 

Add some basic documentation of these operations, with a pointer to
tools/perf/design.txt for more information.

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Michael Kerrisk 2012-04-25 04:38:04 +12:00
parent 50fe8d5366
commit 06afe6739c
1 changed files with 34 additions and 2 deletions
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36
man2/prctl.2
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@ -38,10 +38,9 @@
.\" Document PR_GET_TSC and PR_SET_TSC.
.\" 2008-06-15 mtk, Document PR_SET_SECCOMP, PR_GET_SECCOMP
.\" 2009-10-03 Andi Kleen, document PR_MCE_KILL_*
.\" 2012-04 Cyrill Gorcunov, Document PR_SET_MM
.\"
.\" FIXME: Document PR_SET_TIMERSLACK and PR_GET_TIMERSLACK (new in 2.6.28)
.\" FIXME: Document PR_TASK_PERF_EVENTS_DISABLE and
.\" PR_TASK_PERF_EVENTS_ENABLE (new in 2.6.32)
.\"
.TH PRCTL 2 2012-04-23 "Linux" "Linux Programmer's Manual"
.SH NAME
@ -298,6 +297,39 @@ is not currently implemented
.BR PR_GET_TIMING " (since Linux 2.6.0-test4)"
Return (as the function result) which process timing method is currently
in use.
.\" FIXME: Document PR_TASK_PERF_EVENTS_DISABLE and
.\" PR_TASK_PERF_EVENTS_ENABLE (new in 2.6.32)
.\" Was PR_TASK_PERF_COUNTERS_DISABLE/PR_TASK_PERF_COUNTERS_ENABLE
.\" commit: 1d1c7ddbfab358445a542715551301b7fc363e28
.\" (new in 2.6.31)
.\" Renamed with commit cdd6c482c9ff9c55475ee7392ec8f672eddb7be6
.TP
.BR PR_TASK_PERF_EVENTS_DISABLE " (since Linux 2.6.31)"
Disable all performance counters attached to the calling process,
regardless of whether the counters were created by
this process or another process.
Performance counters created by the calling process for other
processes are unaffected.
For more information on performance counters, see the kernel source file
.IR tools/perf/design.txt .
.IP
Originally called
.BR PR_TASK_PERF_COUNTERS_DISABLE ;
.\" commit 1d1c7ddbfab358445a542715551301b7fc363e28
renamed (with same numerical value)
in Linux 2.6.32.
.TP
.BR PR_TASK_PERF_EVENTS_ENABLE " (since Linux 2.6.31)"
The converse of
.BR PR_TASK_PERF_EVENTS_DISABLE ;
enable performance counters attached to the calling process.
.IP
Originally called
.BR PR_TASK_PERF_COUNTERS_ENABLE ;
.\" commit 1d1c7ddbfab358445a542715551301b7fc363e28
renamed
.\" commit cdd6c482c9ff9c55475ee7392ec8f672eddb7be6
in Linux 2.6.32.
.TP
.BR PR_SET_TSC " (since Linux 2.6.26, x86 only)"
Set the state of the flag determining whether the timestamp counter