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perf tools: Add support for pinned modifier

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This commit adds support for a new modifier "D", which requests that the
event, or group of events, be pinned to the PMU.

The "p" modifier is already taken for precise, and "P" may be used in
future to mean "fully precise".

So we use "D", which stands for pinneD - and looks like a padlock, or if
you're using the ":D" syntax perf smiles at you.

This is an oft-requested feature from our HW folks, who want to be able
to run a large number of events, but also want 100% accurate results for
instructions per cycle.

Comparison of results with and without pinning:

$ perf stat -e '{cycles,instructions}:D' -e cycles,instructions,...

  79,590,480,683 cycles         #  0.000 GHz
 166,123,716,524 instructions   #  2.09  insns per cycle
                                #  0.11  stalled cycles per insn

  79,352,134,463 cycles         #  0.000 GHz                     [11.11%]
 165,178,301,818 instructions   #  2.08  insns per cycle
                                #  0.11  stalled cycles per insn [11.13%]

As you can see although perf does a very good job of scaling the values
in the non-pinned case, there is some small discrepancy.

The patch is fairly straight forward, the one detail is that we need to
make sure we only request pinning for the group leader when we have a
group.

Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Acked-by: Jiri Olsa <jolsa@redhat.com>
Tested-by: Jiri Olsa <jolsa@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1375795686-4226-1-git-send-email-michael@ellerman.id.au
[ Use perf_evsel__is_group_leader instead of open coded equivalent, as
  suggested by Jiri Olsa ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Michael Ellerman 2013-08-06 23:28:05 +10:00 committed by Arnaldo Carvalho de Melo
parent d50bf78ff6
commit e9a7c41447
3 changed files with 13 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
tools/perf/Documentation/perf-list.txt
View File

@ -30,6 +30,7 @@ counted. The following modifiers exist:
H - host counting (not in KVM guests)
p - precise level
S - read sample value (PERF_SAMPLE_READ)
D - pin the event to the PMU
The 'p' modifier can be used for specifying how precise the instruction
address should be. The 'p' modifier can be specified multiple times:

11
tools/perf/util/parse-events.c
View File

@ -688,6 +688,7 @@ struct event_modifier {
int precise;
int exclude_GH;
int sample_read;
int pinned;
};
static int get_event_modifier(struct event_modifier *mod, char *str,
@ -700,6 +701,7 @@ static int get_event_modifier(struct event_modifier *mod, char *str,
int eG = evsel ? evsel->attr.exclude_guest : 0;
int precise = evsel ? evsel->attr.precise_ip : 0;
int sample_read = 0;
int pinned = evsel ? evsel->attr.pinned : 0;
int exclude = eu | ek | eh;
int exclude_GH = evsel ? evsel->exclude_GH : 0;
@ -734,6 +736,8 @@ static int get_event_modifier(struct event_modifier *mod, char *str,
eG = 1;
} else if (*str == 'S') {
sample_read = 1;
} else if (*str == 'D') {
pinned = 1;
} else
break;
@ -761,6 +765,8 @@ static int get_event_modifier(struct event_modifier *mod, char *str,
mod->precise = precise;
mod->exclude_GH = exclude_GH;
mod->sample_read = sample_read;
mod->pinned = pinned;
return 0;
}
@ -773,7 +779,7 @@ static int check_modifier(char *str)
char *p = str;
/* The sizeof includes 0 byte as well. */
if (strlen(str) > (sizeof("ukhGHpppS") - 1))
if (strlen(str) > (sizeof("ukhGHpppSD") - 1))
return -1;
while (*p) {
@ -812,6 +818,9 @@ int parse_events__modifier_event(struct list_head *list, char *str, bool add)
evsel->attr.exclude_guest = mod.eG;
evsel->exclude_GH = mod.exclude_GH;
evsel->sample_read = mod.sample_read;
if (perf_evsel__is_group_leader(evsel))
evsel->attr.pinned = mod.pinned;
}
return 0;

3
tools/perf/util/parse-events.l
View File

@ -82,7 +82,8 @@ num_hex 0x[a-fA-F0-9]+
num_raw_hex [a-fA-F0-9]+
name [a-zA-Z_*?][a-zA-Z0-9_*?]*
name_minus [a-zA-Z_*?][a-zA-Z0-9\-_*?]*
modifier_event [ukhpGHS]+
/* If you add a modifier you need to update check_modifier() */
modifier_event [ukhpGHSD]+
modifier_bp [rwx]{1,3}
%%