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Commit 99320cc8 authored by Joerg Roedel's avatar Joerg Roedel Committed by Arnaldo Carvalho de Melo
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perf tools: Add support for guest/host-only profiling 



To restrict a counter to either host or guest mode this patch introduces
two new event modifiers: G and H.

With G the counter is configured in guest-only mode and with H in
host-only mode.

Cc: Gleb Natapov <gleb@redhat.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: default avatarGleb Natapov <gleb@redhat.com>
Signed-off-by: default avatarJoerg Roedel <joerg.roedel@amd.com>
Link: http://lkml.kernel.org/n/tip-or5aj3rghy9ngyg882z6kln9@git.kernel.org


Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 1aed2671

tools/perf/Documentation/perf-list.txt

+2 −0
Original line number Diff line number Diff line
@@ -21,6 +21,8 @@ EVENT MODIFIERS 
Events can optionally have a modifer by appending a colon and one or

more modifiers.  Modifiers allow the user to restrict when events are

counted with 'u' for user-space, 'k' for kernel, 'h' for hypervisor.

Additional modifiers are 'G' for guest counting (in KVM guests) and 'H'

for host counting (not in KVM guests).



The 'p' modifier can be used for specifying how precise the instruction

address should be. The 'p' modifier is currently only implemented for

tools/perf/util/parse-events.c

+12 −2
Original line number Diff line number Diff line
@@ -735,8 +735,8 @@ static int 
parse_event_modifier(const char **strp, struct perf_event_attr *attr)

{

	const char *str = *strp;

	int exclude = 0;

	int eu = 0, ek = 0, eh = 0, precise = 0;

	int exclude = 0, exclude_GH = 0;

	int eu = 0, ek = 0, eh = 0, eH = 0, eG = 0, precise = 0;



	if (!*str)

		return 0;
@@ -760,6 +760,14 @@ parse_event_modifier(const char **strp, struct perf_event_attr *attr) 
			if (!exclude)

				exclude = eu = ek = eh = 1;

			eh = 0;

		} else if (*str == 'G') {

			if (!exclude_GH)

				exclude_GH = eG = eH = 1;

			eG = 0;

		} else if (*str == 'H') {

			if (!exclude_GH)

				exclude_GH = eG = eH = 1;

			eH = 0;

		} else if (*str == 'p') {

			precise++;

		} else
@@ -776,6 +784,8 @@ parse_event_modifier(const char **strp, struct perf_event_attr *attr) 
	attr->exclude_kernel = ek;

	attr->exclude_hv     = eh;

	attr->precise_ip     = precise;

	attr->exclude_host   = eH;

	attr->exclude_guest  = eG;



	return 0;

}