[patch] perf_event_open.2: Exclude_hv clarification

[Vince Weaver]

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@xxxxxxxxx>

            perf_counters: allow users to count user, kernel and/or hypervisor events

            Signed-off-by: Paul Mackerras <paulus@xxxxxxxxx>

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@xxxxxxxxx>

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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