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Commit a1645ce1 authored by Zhang, Yanmin's avatar Zhang, Yanmin Committed by Avi Kivity
Browse files

perf: 'perf kvm' tool for monitoring guest performance from host 



Here is the patch of userspace perf tool.

Signed-off-by: default avatarZhang Yanmin <yanmin_zhang@linux.intel.com>
Signed-off-by: default avatarAvi Kivity <avi@redhat.com>
parent ff9d07a0

tools/perf/Documentation/perf-kvm.txt

0 → 100644
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perf-kvm(1)

==============



NAME

----

perf-kvm - Tool to trace/measure kvm guest os



SYNOPSIS

--------

[verse]

'perf kvm' [--host] [--guest] [--guestmount=<path>

	[--guestkallsyms=<path> --guestmodules=<path> | --guestvmlinux=<path>]]

	{top|record|report|diff|buildid-list}

'perf kvm' [--host] [--guest] [--guestkallsyms=<path> --guestmodules=<path>

	| --guestvmlinux=<path>] {top|record|report|diff|buildid-list}



DESCRIPTION

-----------

There are a couple of variants of perf kvm:



  'perf kvm [options] top <command>' to generates and displays

  a performance counter profile of guest os in realtime

  of an arbitrary workload.



  'perf kvm record <command>' to record the performance couinter profile

  of an arbitrary workload and save it into a perf data file. If both

  --host and --guest are input, the perf data file name is perf.data.kvm.

  If there is  no --host but --guest, the file name is perf.data.guest.

  If there is no --guest but --host, the file name is perf.data.host.



  'perf kvm report' to display the performance counter profile information

  recorded via perf kvm record.



  'perf kvm diff' to displays the performance difference amongst two perf.data

  files captured via perf record.



  'perf kvm buildid-list' to  display the buildids found in a perf data file,

  so that other tools can be used to fetch packages with matching symbol tables

  for use by perf report.



OPTIONS

-------

--host=::

        Collect host side perforamnce profile.

--guest=::

        Collect guest side perforamnce profile.

--guestmount=<path>::

	Guest os root file system mount directory. Users mounts guest os

        root directories under <path> by a specific filesystem access method,

	typically, sshfs. For example, start 2 guest os. The one's pid is 8888

	and the other's is 9999.

        #mkdir ~/guestmount; cd ~/guestmount

        #sshfs -o allow_other,direct_io -p 5551 localhost:/ 8888/

        #sshfs -o allow_other,direct_io -p 5552 localhost:/ 9999/

        #perf kvm --host --guest --guestmount=~/guestmount top

--guestkallsyms=<path>::

        Guest os /proc/kallsyms file copy. 'perf' kvm' reads it to get guest

	kernel symbols. Users copy it out from guest os.

--guestmodules=<path>::

	Guest os /proc/modules file copy. 'perf' kvm' reads it to get guest

	kernel module information. Users copy it out from guest os.

--guestvmlinux=<path>::

	Guest os kernel vmlinux.



SEE ALSO

--------

linkperf:perf-top[1] perf-record[1] perf-report[1] perf-diff[1] perf-buildid-list[1]

tools/perf/Makefile

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@@ -472,6 +472,7 @@ BUILTIN_OBJS += $(OUTPUT)builtin-trace.o 
BUILTIN_OBJS += $(OUTPUT)builtin-probe.o

BUILTIN_OBJS += $(OUTPUT)builtin-kmem.o

BUILTIN_OBJS += $(OUTPUT)builtin-lock.o

BUILTIN_OBJS += $(OUTPUT)builtin-kvm.o



PERFLIBS = $(LIB_FILE)

tools/perf/builtin-annotate.c

+1 −1
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@@ -571,7 +571,7 @@ static int __cmd_annotate(void) 
		perf_session__fprintf(session, stdout);



	if (verbose > 2)

		dsos__fprintf(stdout);

		dsos__fprintf(&session->kerninfo_root, stdout);



	perf_session__collapse_resort(&session->hists);

	perf_session__output_resort(&session->hists, session->event_total[0]);

tools/perf/builtin-buildid-list.c

+1 −1
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@@ -46,7 +46,7 @@ static int __cmd_buildid_list(void) 
	if (with_hits)

		perf_session__process_events(session, &build_id__mark_dso_hit_ops);



	dsos__fprintf_buildid(stdout, with_hits);

	dsos__fprintf_buildid(&session->kerninfo_root, stdout, with_hits);



	perf_session__delete(session);

	return err;

tools/perf/builtin-diff.c

+5 −1
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@@ -33,7 +33,7 @@ static int perf_session__add_hist_entry(struct perf_session *self, 
		return -ENOMEM;



	if (hit)

		he->count += count;

		__perf_session__add_count(he, al, count);



	return 0;

}
@@ -225,6 +225,10 @@ int cmd_diff(int argc, const char **argv, const char *prefix __used) 
			input_new = argv[1];

		} else

			input_new = argv[0];

	} else if (symbol_conf.default_guest_vmlinux_name ||

		   symbol_conf.default_guest_kallsyms) {

		input_old = "perf.data.host";

		input_new = "perf.data.guest";

	}



	symbol_conf.exclude_other = false;