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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: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Link: http://lkml.kernel.org/n/tip-or5aj3rghy9ngyg882z6kln9@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Joerg Roedel 2012-01-04 17:54:19 +01:00 committed by Arnaldo Carvalho de Melo
parent 1aed267173
commit 99320cc824
2 changed files with 14 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
tools/perf/Documentation/perf-list.txt
View File

@ -21,6 +21,8 @@ EVENT MODIFIERS
Events can optionally have a modifer by appending a colon and one or Events can optionally have a modifer by appending a colon and one or
more modifiers. Modifiers allow the user to restrict when events are more modifiers. Modifiers allow the user to restrict when events are
counted with 'u' for user-space, 'k' for kernel, 'h' for hypervisor. 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 The 'p' modifier can be used for specifying how precise the instruction
address should be. The 'p' modifier is currently only implemented for address should be. The 'p' modifier is currently only implemented for

14
tools/perf/util/parse-events.c
View File

@ -735,8 +735,8 @@ static int
parse_event_modifier(const char **strp, struct perf_event_attr *attr) parse_event_modifier(const char **strp, struct perf_event_attr *attr)
{ {
const char *str = *strp; const char *str = *strp;
int exclude = 0; int exclude = 0, exclude_GH = 0;
int eu = 0, ek = 0, eh = 0, precise = 0; int eu = 0, ek = 0, eh = 0, eH = 0, eG = 0, precise = 0;
if (!*str) if (!*str)
return 0; return 0;
@ -760,6 +760,14 @@ parse_event_modifier(const char **strp, struct perf_event_attr *attr)
if (!exclude) if (!exclude)
exclude = eu = ek = eh = 1; exclude = eu = ek = eh = 1;
eh = 0; 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') { } else if (*str == 'p') {
precise++; precise++;
} else } else
@ -776,6 +784,8 @@ parse_event_modifier(const char **strp, struct perf_event_attr *attr)
attr->exclude_kernel = ek; attr->exclude_kernel = ek;
attr->exclude_hv = eh; attr->exclude_hv = eh;
attr->precise_ip = precise; attr->precise_ip = precise;
attr->exclude_host = eH;
attr->exclude_guest = eG;
return 0; return 0;
} }