[lkml]   [2013]   [Dec]   [8]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
Patch in this message
Subject[PATCH] perf kvm: Introduce option -v for perf kvm command.
As there is no -v option for perf kvm, the all debug message for perf kvm
will nerver be printed out to user.

# perf kvm --guestmount /tmp/guestmount/ record -a
Not enough memory for reading perf file header

It is confusing message for newbies such as me. With this patch applied,
we can use -v option to get the detail.

# perf kvm --guestmount /tmp/guestmount/ record -a -v
Can't access file /tmp/guestmount//15069/proc/kallsyms
Not enough memory for reading perf file header

Signed-off-by: Dongsheng Yang <>
tools/perf/Documentation/perf-kvm.txt | 7 +++++--
tools/perf/builtin-kvm.c | 2 ++
2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/tools/perf/Documentation/perf-kvm.txt b/tools/perf/Documentation/perf-kvm.txt
index 96a9a1d..52276a6 100644
--- a/tools/perf/Documentation/perf-kvm.txt
+++ b/tools/perf/Documentation/perf-kvm.txt
@@ -10,9 +10,9 @@ SYNOPSIS
'perf kvm' [--host] [--guest] [--guestmount=<path>
[--guestkallsyms=<path> --guestmodules=<path> | --guestvmlinux=<path>]]
- {top|record|report|diff|buildid-list}
+ {top|record|report|diff|buildid-list} [<options>]
'perf kvm' [--host] [--guest] [--guestkallsyms=<path> --guestmodules=<path>
- | --guestvmlinux=<path>] {top|record|report|diff|buildid-list|stat}
+ | --guestvmlinux=<path>] {top|record|report|diff|buildid-list|stat} [<options>]
'perf kvm stat [record|report|live] [<options>]

@@ -93,6 +93,9 @@ OPTIONS
kernel module information. Users copy it out from guest os.
Guest os kernel vmlinux.
+ Be more verbose (show counter open errors, etc).

diff --git a/tools/perf/builtin-kvm.c b/tools/perf/builtin-kvm.c
index f8bf5f2..d9cc0e3 100644
--- a/tools/perf/builtin-kvm.c
+++ b/tools/perf/builtin-kvm.c
@@ -1690,6 +1690,8 @@ int cmd_kvm(int argc, const char **argv, const char *prefix __maybe_unused)
"file", "file saving guest os /proc/kallsyms"),
OPT_STRING(0, "guestmodules", &symbol_conf.default_guest_modules,
"file", "file saving guest os /proc/modules"),
+ OPT_INCR('v', "verbose", &verbose,
+ "be more verbose (show counter open errors, etc)"),


 \ /
  Last update: 2013-12-09 05:21    [W:0.136 / U:0.276 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site