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perf kvm top: Limit guest kernel info message to once

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'perf kvm top' shows a continual flurry of:
    Can't find guest [5201]'s kernel information

if it can't find the guest info and with a lot of VMs running a user has no
chance of reading them all. Limit message to once per guest.

Signed-off-by: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1343709095-7089-5-git-send-email-dsahern@gmail.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
David Ahern 2012-07-30 22:31:35 -06:00 committed by Arnaldo Carvalho de Melo
parent 70b40c4a43
commit 6b118e92cc
1 changed files with 11 additions and 2 deletions
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13
tools/perf/builtin-top.c
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@ -38,6 +38,7 @@
#include "util/cpumap.h"
#include "util/xyarray.h"
#include "util/sort.h"
#include "util/intlist.h"
#include "util/debug.h"
@ -706,8 +707,16 @@ static void perf_event__process_sample(struct perf_tool *tool,
int err;
if (!machine && perf_guest) {
pr_err("Can't find guest [%d]'s kernel information\n",
event->ip.pid);
static struct intlist *seen;
if (!seen)
seen = intlist__new();
if (!intlist__has_entry(seen, event->ip.pid)) {
pr_err("Can't find guest [%d]'s kernel information\n",
event->ip.pid);
intlist__add(seen, event->ip.pid);
}
return;
}