12 Aug, 2011
1 commit
-
A file in /tmp/ might be a symlink, so lstat() should be used instead of
stat().Acked-by: Pekka Enberg
Cc: Frederic Weisbecker
Cc: Ingo Molnar
Cc: Paul Mackerras
Cc: Pekka Enberg
Cc: Peter Zijlstra
Cc: Peter Zijlstra
Link: http://lkml.kernel.org/r/20110811205537.GA22864@albatros
Signed-off-by: Vasiliy Kulikov
Signed-off-by: Arnaldo Carvalho de Melo
11 Aug, 2011
1 commit
-
If we bring the recorded perf data together with kernel binary from another
machine using:on server A:
perf archiveon server B:
tar xjvf perf.data.tar.bz2 -C ~/.debugthe build_id kernel dso is not properly recognized during the "perf report"
command on server B.The reason is, that build_id dsos are added during the session initialization,
while the kernel maps are created during the sample event processing.The machine__create_kernel_maps functions ends up creating new dso object for
kernel, but it does not check if we already have one added by build_id
processing.Also the build_id reading ABI quirk added in commit:
- commit b25114817a73bbd2b84ce9dba02ee1ef8989a947
perf build-id: Add quirk to deal with perf.data file format breakagepopulates the "struct build_id_event::pid" with 0, which
is later interpreted as DEFAULT_GUEST_KERNEL_ID.This is not always correct, so it's better to guess the pid
value based on the "struct build_id_event::header::misc" value.- Tested with data generated on x86 kernel version v2.6.34
and reported back on x86_64 current kernel.
- Not tested for guest kernel case.Note the problem stays for PERF_RECORD_MMAP events recorded by perf that
does not use proper pid (HOST_KERNEL_ID/DEFAULT_GUEST_KERNEL_ID). They are
misinterpreted within the current perf code. Probably there's not much we
can do about that.Cc: Avi Kivity
Cc: Frederic Weisbecker
Cc: Ingo Molnar
Cc: Yanmin Zhang
Link: http://lkml.kernel.org/r/20110601194346.GB1934@jolsa.brq.redhat.com
Signed-off-by: Jiri Olsa
Signed-off-by: Arnaldo Carvalho de Melo
10 Aug, 2011
4 commits
-
It will be immediately replaced in perf_top_browser__run.
Cc: David Ahern
Cc: Frederic Weisbecker
Cc: Mike Galbraith
Cc: Paul Mackerras
Cc: Peter Zijlstra
Cc: Stephane Eranian
Link: http://lkml.kernel.org/n/tip-q7e2jzb44elqpkvdllk94x0i@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo -
The external symbol files are generated by JIT compilers, for example, but we
need to make sure they're ours before injecting them to 'perf report'.Requested-by: Ingo Molnar
Cc: Frederic Weisbecker
Cc: Peter Zijlstra
Link: http://lkml.kernel.org/r/1312919658-17158-1-git-send-email-penberg@kernel.org
Signed-off-by: Pekka Enberg
Signed-off-by: Arnaldo Carvalho de Melo -
The 'perf sched' command usage still showing 'trace' command instead of
the 'script' command.Cc: Ingo Molnar
Cc: Paul Mackerras
Cc: Peter Zijlstra
Link: http://lkml.kernel.org/r/20110809124651.GD2056@jolsa.brq.redhat.com
Signed-off-by: Jiri Olsa
Signed-off-by: Arnaldo Carvalho de Melo -
The session object is released prematurely when processing events for
latency command. The session's thread objects are used within the
output_lat_thread function.Runnning following commands:
# perf sched record
# perf sched latencythe latter displays incorrect data and might cause access violation.
Cc: Ingo Molnar
Cc: Paul Mackerras
Cc: Peter Zijlstra
Link: http://lkml.kernel.org/r/1312837414-3819-1-git-send-email-jolsa@redhat.com
Signed-off-by: Jiri Olsa
Signed-off-by: Arnaldo Carvalho de Melo
09 Aug, 2011
1 commit
-
Just like we do already for perf.data files.
Requested-by: Ingo Molnar
Cc: Ben Hutchings
Cc: Christian Ohm
Cc: David Ahern
Cc: Frederic Weisbecker
Cc: Jonathan Nieder
Cc: Mike Galbraith
Cc: Paul Mackerras
Cc: Peter Zijlstra
Cc: Stephane Eranian
Link: http://lkml.kernel.org/n/tip-qgokmxsmvppwpc5404qhyk7e@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo
08 Aug, 2011
5 commits
-
Adding install-python_ext target to install python extension related
files. Installation directory is governed by python distutils package
and follows the DESTDIR variable settings.Also moving python extension build output into '$(O)python_ext_build'
directory and making it configurable via PYTHON_EXTBUILD variable.Keeping the '$(O)python/perf.so' file, so it could be used for testing
as of until now.Cc: Ingo Molnar
Cc: Paul Mackerras
Cc: Peter Zijlstra
Link: http://lkml.kernel.org/r/20110722113307.GA1931@jolsa.brq.redhat.com
Signed-off-by: Jiri Olsa
Signed-off-by: Arnaldo Carvalho de Melo -
In addition to /etc/perfconfig and $HOME/.perfconfig, perf looks for
configuration in the file ./config, imitating git which looks at
$GIT_DIR/config. If ./config is not a perf configuration file, it
fails, or worse, treats it as a configuration file and changes behavior
in some unexpected way."config" is not an unusual name for a file to be lying around and perf
does not have a private directory dedicated for its own use, so let's
just stop looking for configuration in the cwd. Callers needing
context-sensitive configuration can use the PERF_CONFIG environment
variable.Requested-by: Christian Ohm
Cc: 632923@bugs.debian.org
Cc: Ben Hutchings
Cc: Christian Ohm
Cc: Ingo Molnar
Cc: Paul Mackerras
Cc: Peter Zijlstra
Link: http://lkml.kernel.org/r/20110805165838.GA7237@elie.gateway.2wire.net
Signed-off-by: Jonathan Nieder
Signed-off-by: Arnaldo Carvalho de Melo -
Use LIB_OBJS and BUILTIN_OBJS for .o files.
LIB_FILE is already prefixed with OUTPUT.
Cc: Ingo Molnar
Cc: Paul Mackerras
Cc: Peter Zijlstra
Link: http://lkml.kernel.org/r/20110807083932.9C0E514C03B@msa103.auone-net.jp
Signed-off-by: Kusanagi Kouichi
Signed-off-by: Arnaldo Carvalho de Melo -
Looks to me like the :r modifier is not supported anymore, so remove it
from the list of events. Without this fix 'perf lock record' doesn't
work.Cc: Ingo Molnar
Cc: Paul Mackerras
Cc: Zhu Yanhai
Cc: Peter Zijlstra
Link: http://lkml.kernel.org/r/1312035232-9534-1-git-send-email-gaoyang.zyh@taobao.com
Signed-off-by: Zhu Yanhai
Signed-off-by: Arnaldo Carvalho de Melo -
perf will coredump if the user doesn't give the "-m" option in probe
command, this patch fixes it.[root@localhost perf]# ./perf probe --add='PROBE'
Segmentation fault (core dumped)Cc: Ingo Molnar
Cc: Paul Mackerras
Cc: Peter Zijlstra
Link: http://lkml.kernel.org/r/1311602888-2389-1-git-send-email-bookjovi@gmail.com
Signed-off-by: Jovi Zhang
Signed-off-by: Arnaldo Carvalho de Melo
03 Aug, 2011
1 commit
-
So that we get a proper warning in the TUI in cases like:
$ perf report --stdio -g fractal,0.5,caller --sort pid
Selected -g but no callchain data. Did you call 'perf record' without -g?
$The --stdio case is ok because it uses fprintf, ui__warning is needed to
figure out if --stdio or --tui is being used.Cc: Arun Sharma
Cc: David Ahern
Cc: Frederic Weisbecker
Cc: Mike Galbraith
Cc: Paul Mackerras
Cc: Peter Zijlstra
Cc: Sam Liao
Cc: Stephane Eranian
Link: http://lkml.kernel.org/n/tip-ag9fz2wd17mbbfjsbznq1wms@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo
26 Jul, 2011
1 commit
-
So those friggin "spurious" PERF_RECORD_MMAP events were actually a
brain fart copy'n'paste error in the python binding, doh. I.e. they
weren't MMAPs, just SAMPLEs.Fix it by providing routines for these events instead of using the MMAP
ones.Cc: David Ahern
Cc: Frederic Weisbecker
Cc: Mike Galbraith
Cc: Paul Mackerras
Cc: Peter Zijlstra
Cc: Stephane Eranian
Link: http://lkml.kernel.org/n/tip-b0rc8y5jd03f9f11kftodvkm@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo
25 Jul, 2011
1 commit
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To remove the last case of access to the FD() macro outside the library.
Inspired by a patch by Borislav that moved the FD() macro to util.h, for
namespace concerns I rather preferred to constrain it to ev{sel,list}.c.Cc: Borislav Petkov
Cc: David Ahern
Cc: Frederic Weisbecker
Cc: Mike Galbraith
Cc: Paul Mackerras
Cc: Peter Zijlstra
Cc: Stephane Eranian
Link: http://lkml.kernel.org/n/tip-qn893qsstcg366tkucu649qj@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo
22 Jul, 2011
1 commit
-
The readlink() function doesn't append a null byte to buf. So we should
zero out buf with zalloc(). Or we'll see sometimes error like this:[root@intel-s3e36-01]~# /usr/bin/perf buildid-cache -a /lib/modules/2.6.32-130.el6.x86_64/kernel/crypto/twofish_common.ko -v
Adding f64ba8efd5f53c7ad332fc17db1d21de309038e1 /lib/modules/2.6.32-130.el6.x86_64/kernel/crypto/twofish_common.ko: Ok
[root@intel-s3e36-01]~# /usr/bin/perf buildid-cache -r /lib/modules/2.6.32-130.el6.x86_64/kernel/crypto/twofish_common.ko -v
Removing f64ba8efd5f53c7ad332fc17db1d21de309038e1 /lib/modules/2.6.32-130.el6.x86_64/kernel/crypto/twofish_common.ko: FAIL
/lib/modules/2.6.32-130.el6.x86_64/kernel/crypto/twofish_common.ko wasn't in the cacheThe change in build_id_cache__add_s() is a defense.
Tested-by: Jiri Olsa
Cc: Jiri Olsa
Link: http://lkml.kernel.org/r/20110718031314.GA5802@hpt.nay.redhat.com
Signed-off-by: Han Pingtian
Signed-off-by: Arnaldo Carvalho de Melo
21 Jul, 2011
6 commits
-
Use preset debugfs path instead of hardcoded one.
Signed-off-by: Jiri Olsa
Cc: acme@redhat.com
Cc: a.p.zijlstra@chello.nl
Cc: paulus@samba.org
Link: http://lkml.kernel.org/r/1310635534-4013-4-git-send-email-jolsa@redhat.com
Signed-off-by: Ingo Molnar -
Adding builtin test for parse_events function, which is
responsible for parsing/processing "-e" option for
stat/top/record commands.This new test will run within the builtin test command suite
(perf test).One or several tests were added for each type of event.
More tests could be added easily if needed.Signed-off-by: Jiri Olsa
Cc: acme@redhat.com
Cc: a.p.zijlstra@chello.nl
Cc: paulus@samba.org
Link: http://lkml.kernel.org/r/1310635534-4013-3-git-send-email-jolsa@redhat.com
Signed-off-by: Ingo Molnar -
Moving out the option parameter from parse_events function,
and adding new parse_events_option function instead.The option parameter is used only to carry "struct perf_evlist"
pointer for chaining new events. Putting it away, enable us
to call parse_events from other places without using the
option parameter.Signed-off-by: Jiri Olsa
Cc: acme@redhat.com
Cc: a.p.zijlstra@chello.nl
Cc: paulus@samba.org
Link: http://lkml.kernel.org/r/1310635534-4013-2-git-send-email-jolsa@redhat.com
Signed-off-by: Ingo Molnar -
Non-callchain path is using al.addr which prints as:
openssl 14564 17672.003587: 7862d _x86_64_AES_encrypt_compactThis should be sample->ip to print as:
openssl 14564 17672.003587: 3f7867862d _x86_64_AES_encrypt_compactSigned-off-by: David Ahern
Acked-by: Frederic Weisbecker
Cc: acme@ghostprotocols.net
Cc: peterz@infradead.org
Cc: paulus@samba.org
Link: http://lkml.kernel.org/r/1306768587-15376-1-git-send-email-dsahern@gmail.com
Signed-off-by: Ingo Molnar -
The perf_event_attr struct has two __u32's at the top and
they need to be swapped individually.With this change I was able to analyze a perf.data collected in a
32-bit PPC VM on an x86 system. I tested both 32-bit and 64-bit
binaries for the Intel analysis side; both read the PPC perf.data
file correctly.-v2:
- changed the existing perf_event__attr_swap() to swap only elements
of perf_event_attr and exported it for use in swapping the
attributes in the file header
- updated swap_ops used for processing eventsSigned-off-by: David Ahern
Acked-by: Frederic Weisbecker
Cc: acme@ghostprotocols.net
Cc: peterz@infradead.org
Cc: paulus@samba.org
Cc:
Link: http://lkml.kernel.org/r/1310754849-12474-1-git-send-email-dsahern@gmail.com
Signed-off-by: Ingo Molnar -
Add "node" as a simple alias for NODE cache events.
The addition of NODE cache events broke the parse_alias
function, so any mismatched event caused the segfault, like:# ./perf stat -e krava ls
The hw_cache/hw_cache_op/hw_cache_result arrays needs to follow
PERF_COUNT_HW_CACHE_*MAX enums. Adding those MAXs to be size
of those arrays, so possible ommision in future wil not lead to
segfault.Adding read/write/prefetch as allowed operations for node cache
event.Signed-off-by: Jiri Olsa
Acked-by: Peter Zijlstra
Cc: acme@redhat.com
Link: http://lkml.kernel.org/r/20110713205818.GB7827@jolsa.brq.redhat.com
Signed-off-by: Ingo Molnar
16 Jul, 2011
7 commits
-
Support adding probes on offline kernel modules. This enables
perf-probe to trace kernel-module init functions via perf-probe.
If user gives the path of module with -m option, perf-probe
expects the module is offline.
This feature works with --add, --funcs, and --vars.E.g)
# perf probe -m /lib/modules/`uname -r`/kernel/fs/btrfs/btrfs.ko \
-a "extent_io_init:5 extent_state_cache"
Add new events:
probe:extent_io_init (on extent_io_init:5 with extent_state_cache)
probe:extent_io_init_1 (on extent_io_init:5 with extent_state_cache)You can now use it on all perf tools, such as:
perf record -e probe:extent_io_init_1 -aR sleep 1
Signed-off-by: Masami Hiramatsu
Cc: Peter Zijlstra
Cc: Frederic Weisbecker
Cc: Paul Mackerras
Cc: Ingo Molnar
Cc: Arnaldo Carvalho de Melo
Link: http://lkml.kernel.org/r/20110627072751.6528.10230.stgit@fedora15
Signed-off-by: Steven Rostedt -
Add probed module name and ":" in front of function name
if -m module option is given. In the result, the symbol
name passed to kprobe-tracer becomes MODULE:FUNCTION,
so that kallsyms can solve it as a symbol in the module
correctly.Signed-off-by: Masami Hiramatsu
Cc: Peter Zijlstra
Cc: Frederic Weisbecker
Cc: Paul Mackerras
Cc: Ingo Molnar
Cc: Arnaldo Carvalho de Melo
Link: http://lkml.kernel.org/r/20110627072745.6528.26416.stgit@fedora15
Signed-off-by: Steven Rostedt -
Introduce debuginfo to encapsulate dwarf information.
This new object allows us to reuse and expand debuginfo easily.Signed-off-by: Masami Hiramatsu
Cc: Peter Zijlstra
Cc: Frederic Weisbecker
Cc: Paul Mackerras
Cc: Ingo Molnar
Cc: Arnaldo Carvalho de Melo
Link: http://lkml.kernel.org/r/20110627072739.6528.12438.stgit@fedora15
Signed-off-by: Steven Rostedt -
Move dwarf library related routines to dwarf-aux.{c,h}.
This includes several minor changes.
- Add simple documents for each API.
- Rename die_find_real_subprogram() to die_find_realfunc()
- Rename line_walk_handler_t to line_walk_callback_t.
- Minor cleanups.Signed-off-by: Masami Hiramatsu
Cc: Peter Zijlstra
Cc: Frederic Weisbecker
Cc: Paul Mackerras
Cc: Ingo Molnar
Cc: Arnaldo Carvalho de Melo
Link: http://lkml.kernel.org/r/20110627072727.6528.57647.stgit@fedora15
Signed-off-by: Steven Rostedt -
Since there are dwarf_bitsize, dwarf_bitoffset and dwarf_bytesize
defined in libdw, we don't need die_get_bit_size, die_get_bit_offset
and die_get_byte_size anymore.Signed-off-by: Masami Hiramatsu
Cc: Peter Zijlstra
Cc: Frederic Weisbecker
Cc: Paul Mackerras
Cc: Ingo Molnar
Cc: Arnaldo Carvalho de Melo
Link: http://lkml.kernel.org/r/20110627072721.6528.2747.stgit@fedora15
Signed-off-by: Steven Rostedt -
Since strtailcmp() is enough generic, it should be defined in string.c.
Signed-off-by: Masami Hiramatsu
Cc: Peter Zijlstra
Cc: Frederic Weisbecker
Cc: Paul Mackerras
Cc: Ingo Molnar
Cc: Arnaldo Carvalho de Melo
Link: http://lkml.kernel.org/r/20110627072715.6528.10677.stgit@fedora15
Signed-off-by: Steven Rostedt -
Since die_find/walk* callbacks use DIE_FIND_CB_FOUND for
both of failed and found cases, it should be "END"
instead "FOUND" for avoiding confusion.Signed-off-by: Masami Hiramatsu
Reported-by: Arnaldo Carvalho de Melo
Cc: Peter Zijlstra
Cc: Frederic Weisbecker
Cc: Paul Mackerras
Cc: Ingo Molnar
Link: http://lkml.kernel.org/r/20110627072709.6528.45706.stgit@fedora15
Signed-off-by: Steven Rostedt
15 Jul, 2011
1 commit
-
While attempting to create a timechart of boot up I found perf didn't
tolerate modules being loaded/unloaded. This patch fixes this by
reading the file once and then writing the size read at the correct
point in the file. It also simplifies the code somewhat.Cc: Peter Zijlstra
Cc: Paul Mackerras
Cc: Ingo Molnar
Cc: Arnaldo Carvalho de Melo
Signed-off-by: Sonny Rao
Signed-off-by: Michael Neuling
Link: http://lkml.kernel.org/r/10011.1310614483@neuling.org
Signed-off-by: Steven Rostedt
05 Jul, 2011
1 commit
-
Add an option to perf report/annotate/script to specify which
CPUs to operate on. This enables us to take a single system wide
profile and analyse each CPU (or group of CPUs) in isolation.This was useful when profiling a multiprocess workload where the
bottleneck was on one CPU but this was hidden in the overall
profile. Per process and per thread breakdowns didn't help
because multiple processes were running on each CPU and no
single process consumed an entire CPU.The patch converts the list of CPUs returned by cpu_map__new
into a bitmap for fast lookup. I wanted to use -C to be
consistent with perf top/record/stat, but unfortunately perf
report already uses -C .v2: Incorporate suggestions from David Ahern:
- Added -c to perf script
- Check that SAMPLE_CPU is set when -c is used
- Update documentationv3: Create perf_session__cpu_bitmap()
Signed-off-by: Anton Blanchard
Acked-by: David Ahern
Cc: Arnaldo Carvalho de Melo
Cc: Peter Zijlstra
Cc: Paul Mackerras
Link: http://lkml.kernel.org/r/20110704215750.11647eb9@kryten
Signed-off-by: Ingo Molnar
01 Jul, 2011
3 commits
-
Previously, when you want perf-stat to output the statistics in
csv mode, no information of the noise will be printed out.For example right now we output this --repeat information:
./perf stat -r3 -x, sleep 1
1.164789,task-clock
8,context-switches
0,CPU-migrations
219,page-faults
3337800,cyclesWith this patch, the output will be appended with an additional
entry for the noise value:./perf stat -r3 -x, sleep 1
1.164789,task-clock,3.75%
8,context-switches,75.00%
0,CPU-migrations,100.00%
219,page-faults,0.00%
3337800,cycles,3.36%Signed-off-by: Zhengyu He
Cc: Paul Mackerras
Cc: Arnaldo Carvalho de Melo
Cc: Stephane Eranian
Cc: Venkatesh Pallipadi
Cc: Peter Zijlstra
Cc: Frederic Weisbecker
Link: http://lkml.kernel.org/r/1308861942-4945-1-git-send-email-zhengyuh@google.com
Signed-off-by: Ingo Molnar -
…ic/random-tracing into perf/core
-
Merge reason: Pick up the latest fixes.
Signed-off-by: Ingo Molnar
30 Jun, 2011
6 commits
-
We don't need to display the parent field if the parent
sorting machinery is only used for parent filtering
(as in "-p foo").However if parent filtering is used in combination with
explicit parent sorting ( -s parent), we want to
display it.Result with:
perf report -p kernel_thread -s parent
Before:
# Overhead Parent symbol
# ........ .............
#
0.07%
|
--- ioread8
ata_sff_check_status
ata_sff_tf_load
ata_sff_qc_issue
ata_bmdma_qc_issue
ata_qc_issue
ata_scsi_translate
ata_scsi_queuecmd
scsi_dispatch_cmd
scsi_request_fn
__blk_run_queue
__make_request
generic_make_request
submit_bio
submit_bh
journal_submit_commit_record
jbd2_journal_commit_transaction
kjournald2
kthread
kernel_thread_helpeAfter:
# Overhead Parent symbol
# ........ .............
#
0.07% kernel_thread_helper
|
--- ioread8
ata_sff_check_status
ata_sff_tf_load
ata_sff_qc_issue
ata_bmdma_qc_issue
ata_qc_issue
ata_scsi_translate
ata_scsi_queuecmd
scsi_dispatch_cmd
scsi_request_fn
__blk_run_queue
__make_request
generic_make_request
submit_bio
submit_bh
journal_submit_commit_record
jbd2_journal_commit_transaction
kjournald2
kthread
kernel_thread_helperSigned-off-by: Frederic Weisbecker
Cc: Ingo Molnar
Cc: Peter Zijlstra
Cc: Arnaldo Carvalho de Melo
Cc: Stephane Eranian
Cc: David Ahern
Cc: Sam Liao -
So that the parent sort dimension can be registered twice: once
if we add it as an explicit sort dimension (-s parent) and twice
if we request a parent filter (-p foo).We'll have only one parent sort dimension in the end but this
allows to override the default parent filter with we gave in "-p"
option. The goal of this is to prepare to allow the use of
"-s parent" and "-p foo" at the same time, ie: sort by filtered
parent.Signed-off-by: Frederic Weisbecker
Cc: Ingo Molnar
Cc: Peter Zijlstra
Cc: Arnaldo Carvalho de Melo
Cc: Stephane Eranian
Cc: David Ahern
Cc: Sam Liao -
As for newt ui, don't display entries that have been marked
as ignored.The practical current effect of this is to make parent
filtering really working. Before, entries that were ignored
were given a null parent but were still displayed. This
resulted in some weird effects:# Overhead Command Shared Object Symbol
# ........ ........... ................. ............
#
^A
|
--- __lock_acquire
|
|--95.97%-- lock_acquire
| |
| |--30.75%-- _raw_spin_lockDiscard these from the stdio display.
Signed-off-by: Frederic Weisbecker
Cc: Ingo Molnar
Cc: Peter Zijlstra
Cc: Arnaldo Carvalho de Melo
Cc: Stephane Eranian
Cc: David Ahern
Cc: Sam Liao -
These are probably some old leftovers.
Signed-off-by: Frederic Weisbecker
Cc: Ingo Molnar
Cc: Peter Zijlstra
Cc: Arnaldo Carvalho de Melo
Cc: Stephane Eranian
Cc: David Ahern
Cc: Sam Liao -
These don't need to be globally visible.
Signed-off-by: Frederic Weisbecker
Cc: Ingo Molnar
Cc: Peter Zijlstra
Cc: Arnaldo Carvalho de Melo
Cc: Stephane Eranian
Cc: David Ahern
Cc: Sam Liao -
Add "caller/callee" option to support inverted butterfly report,
in the inverted report (with caller option), the call graph start
from the callee's ancestor. Users can use such view to catch system's
performance bottleneck from a sysprof like view. Using this option
with specified sort order like pid gives us high level view of call
graph statistics.Also add "-G" alias for inverted call graph.
Signed-off-by: Sam Liao
Cc: Ingo Molnar
Cc: Peter Zijlstra
Cc: Arnaldo Carvalho de Melo
Cc: Stephane Eranian
Cc: David Ahern
Signed-off-by: Frederic Weisbecker
