Messages in this thread Patch in this message | | | From | Vince Weaver <> | Date | Wed, 11 Feb 2015 14:04:53 -0500 (EST) | Subject | [patch] perf_event_open.2: Exclude_hv clarification |
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This manpage patch relates to the exclude_hv bit added to the kernel in the following commit:
exclude_hv; Linux 2.6.31 commit 0475f9ea8e2cc030298908949e0d5da9f2fc2cfe Author: Paul Mackerras <paulus@samba.org>
perf_counters: allow users to count user, kernel and/or hypervisor events
Signed-off-by: Paul Mackerras <paulus@samba.org>
The updated manpage text points out that the exclude_hv "exclude hypervisor" bit only applies on hardware that supports this feature (such as PowerPC) and is silently ignored on other platforms such as x86.
This is a resend of the patch; the previous time I sent it (http://thread.gmane.org/gmane.linux.man/7500) it did not receive any comments.
Signed-off-by: Vince Weaver <vincent.weaver@maine.edu>
diff --git a/man2/perf_event_open.2 b/man2/perf_event_open.2 index 39c8d8c..665aa31 100644 --- a/man2/perf_event_open.2 +++ b/man2/perf_event_open.2 @@ -856,10 +856,9 @@ If this bit is set, the count excludes events that happen in kernel-space. .IR "exclude_hv" If this bit is set, the count excludes events that happen in the hypervisor. -This is mainly for PMUs that have built-in support for handling this -(such as POWER). -Extra support is needed for handling hypervisor measurements on most -machines. +This is mainly for PMUs that have built-in hardware support +for this feature (such as POWER; this setting is silently +ignored on x86). .TP .IR "exclude_idle" If set, don't count when the CPU is idle.
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