perf kvm: Introduce option -v for perf kvm command. (100b9073) · Commits · 戴 / test

As there is no -v option for perf kvm, the all debug message for perf kvm will nerver be printed out to user. Example: # 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. Example: # 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 <yangds.fnst@cn.fujitsu.com> Cc: David Ahern <dsahern@gmail.com> Link: http://lkml.kernel.org/r/1386609311-23889-1-git-send-email-yangds.fnst@cn.fujitsu.com Signed-off-by:

Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/Documentation/perf-kvm.txt

+5 −2

Original line number	Diff line number	Diff line
		@@ -10,9 +10,9 @@ SYNOPSIS
		[verse]
		'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>]

		DESCRIPTION
		@@ -93,6 +93,9 @@ OPTIONS
		kernel module information. Users copy it out from guest os.
		--guestvmlinux=<path>::
		Guest os kernel vmlinux.
		-v::
		--verbose::
		Be more verbose (show counter open errors, etc).

		STAT REPORT OPTIONS
		-------------------

tools/perf/builtin-kvm.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -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)"),
		OPT_END()
		};

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