Commits · 83da316a3bb6de327a070471584be4a0165bee7f · Kirill Smelkov / linux

25 Jun, 2024 9 commits

perf unwind-libunwind: Add malloc() failure handling · 83da316a

Yunseong Kim authored Jun 20, 2024

Add malloc() failure handling in unread_unwind_spec_debug_frame().
This make caller find_proc_info() works well when the allocation failure.
Signed-off-by: Yunseong Kim <yskelg@gmail.com>
Reviewed-by: Ian Rogers <irogers@google.com>
Cc: Ravi Bangoria <ravi.bangoria@amd.com>
Cc: Austin Kim <austindh.kim@gmail.com>
Cc: shjy180909@gmail.com
Cc: Ze Gao <zegao2021@gmail.com>
Cc: Leo Yan <leo.yan@linux.dev>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Link: https://lore.kernel.org/r/20240619204211.6438-2-yskelg@gmail.com

83da316a

util: constant -1 with expression of type char · e9ffa312

Yunseong Kim authored Jun 20, 2024

This patch resolve following warning.

  tools/perf/util/evsel.c:1620:9: error: result of comparison of constant
   -1 with expression of type 'char' is always false
   -Werror,-Wtautological-constant-out-of-range-compare
   1620 |                 if (c == -1)
        |                     ~ ^  ~~
Signed-off-by: Yunseong Kim <yskelg@gmail.com>
Reviewed-by: Ian Rogers <irogers@google.com>
Cc: Ravi Bangoria <ravi.bangoria@amd.com>
Cc: Austin Kim <austindh.kim@gmail.com>
Cc: shjy180909@gmail.com
Cc: Ze Gao <zegao2021@gmail.com>
Cc: Leo Yan <leo.yan@linux.dev>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Link: https://lore.kernel.org/r/20240619203428.6330-2-yskelg@gmail.com

e9ffa312

perf: Timehist account sch delay for scheduled out running · d363c2a8

Fernand Sieber authored Jun 18, 2024

When using perf timehist, sch delay is only computed for a waking task,
not for a pre empted task. This patches changes sch delay to account for
both. This makes sense as testing scheduling policy need to consider the
effect of scheduling delay globally, not only for waking tasks.

Example of `perf timehist` report before the patch for `stress` task
competing with each other.

First column is wait time, second column sch delay, third column
runtime.

1.492060 [0000] s stress[81] 1.999 0.000 2.000 R next: stress[83]
1.494060 [0000] s stress[83] 2.000 0.000 2.000 R next: stress[81]
1.496060 [0000] s stress[81] 2.000 0.000 2.000 R next: stress[83]
1.498060 [0000] s stress[83] 2.000 0.000 1.999 R next: stress[81]

After the patch, it looks like this (note that all wait time is not zero
anymore):

1.492060 [0000] s stress[81] 1.999 1.999 2.000 R next: stress[83]
1.494060 [0000] s stress[83] 2.000 2.000 2.000 R next: stress[81]
1.496060 [0000] s stress[81] 2.000 2.000 2.000 R next: stress[83]
1.498060 [0000] s stress[83] 2.000 2.000 1.999 R next: stress[81]
Signed-off-by: Fernand Sieber <sieberf@amazon.com>
Reviewed-by: Madadi Vineeth Reddy <vineethr@linux.ibm.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Link: https://lore.kernel.org/r/20240618090339.87482-1-sieberf@amazon.com

d363c2a8

perf tests: Add APX and other new instructions to x86 instruction decoder test · fcd094e5

Adrian Hunter authored May 02, 2024

Add samples of APX and other new instructions to the 'x86 instruction
decoder - new instructions' test.

Note the test is only available if the perf tool has been built with
EXTRA_TESTS=1.

Example:

  $ make EXTRA_TESTS=1 -C tools/perf
  $ tools/perf/perf test -F -v 'new ins' |& grep -i 'jmpabs\|popp\|pushp'
  Decoded ok: d5 00 a1 ef cd ab 90 78 56 34 12    jmpabs $0x1234567890abcdef
  Decoded ok: d5 08 53                    pushp  %rbx
  Decoded ok: d5 18 50                    pushp  %r16
  Decoded ok: d5 19 57                    pushp  %r31
  Decoded ok: d5 19 5f                    popp   %r31
  Decoded ok: d5 18 58                    popp   %r16
  Decoded ok: d5 08 5b                    popp   %rbx
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Chang S. Bae <chang.seok.bae@intel.com>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Nikolay Borisov <nik.borisov@suse.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: x86@kernel.org
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Link: https://lore.kernel.org/r/20240502105853.5338-11-adrian.hunter@intel.com

fcd094e5

perf intel pt: Add new JMPABS instruction to the Intel PT instruction decoder · a44abd2c

Adrian Hunter authored May 02, 2024

JMPABS is 64-bit absolute direct jump instruction, encoded with a mandatory
REX2 prefix. JMPABS is designed to be used in the procedure linkage table
(PLT) to replace indirect jumps, because it has better performance. In that
case the jump target will be amended at run time. To enable Intel PT to
follow the code, a TIP packet is always emitted when JMPABS is traced under
Intel PT.

Refer to the Intel Advanced Performance Extensions (Intel APX) Architecture
Specification for details.

Decode JMPABS as an indirect jump, because it has an associated TIP packet
the same as an indirect jump and the control flow should follow the TIP
packet payload, and not assume it is the same as the on-file object code
JMPABS target address.
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Chang S. Bae <chang.seok.bae@intel.com>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Nikolay Borisov <nik.borisov@suse.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: x86@kernel.org
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Link: https://lore.kernel.org/r/20240502105853.5338-10-adrian.hunter@intel.com

a44abd2c

perf test: Check output of the probe ... --funcs command · abc0f0c4

Chaitanya S Prakash authored Jun 01, 2024

Test "perf probe of function from different CU" only checks if the perf
command has failed and doesn't test the --funcs output. In the issue
reported in the previous commit, the garbage output of the --funcs
command was being ignored by the test when it could have been caught.

The script first makes use of --funcs option with the perf probe command
to check if the function "foo" exists in the testfile before adding a
probe to it in the next command. The output of probe...--funcs command
is redirected to stdout, therefore, add '| grep "foo"' to validate the
result.
Signed-off-by: Chaitanya S Prakash <chaitanyas.prakash@arm.com>
Reviewed-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Cc: anshuman.khandual@arm.com
Cc: james.clark@arm.com
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Link: https://lore.kernel.org/r/20240601125946.1741414-11-ChaitanyaS.Prakash@arm.com

abc0f0c4

tools/perf: Fix parallel-perf python script to replace new python syntax ":=" usage · 7d49ced8

Athira Rajeev authored Jun 23, 2024

perf test "perf script tests" fails as below in systems
with python 3.6

	File "/home/athira/linux/tools/perf/tests/shell/../../scripts/python/parallel-perf.py", line 442
	if line := p.stdout.readline():
             ^
	SyntaxError: invalid syntax
	--- Cleaning up ---
	---- end(-1) ----
	92: perf script tests: FAILED!

This happens because ":=" is a new syntax that assigns values
to variables as part of a larger expression. This is introduced
from python 3.8 and hence fails in setup with python 3.6
Address this by splitting the large expression and check the
value in two steps:
Previous line: if line := p.stdout.readline():
Current change:
	line = p.stdout.readline()
	if line:

With patch

	./perf test "perf script tests"
	 93: perf script tests:  Ok
Signed-off-by: Athira Rajeev <atrajeev@linux.vnet.ibm.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: akanksha@linux.ibm.com
Cc: kjain@linux.ibm.com
Cc: maddy@linux.ibm.com
Cc: disgoel@linux.vnet.ibm.com
Cc: linuxppc-dev@lists.ozlabs.org
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Link: https://lore.kernel.org/r/20240623064850.83720-3-atrajeev@linux.vnet.ibm.com

7d49ced8

tools/perf: Use is_perf_pid_map_name helper function to check dso's of pattern /tmp/perf-%d.map · b9241f15

Athira Rajeev authored Jun 23, 2024

commit 80d496be ("perf report: Add support for profiling JIT
generated code") added support for profiling JIT generated code.
This patch handles dso's of form "/tmp/perf-$PID.map".

Some of the references doesn't check exactly for same pattern.
some uses "if (!strncmp(dso_name, "/tmp/perf-", 10))". Fix
this by using helper function perf_pid_map_tid and
is_perf_pid_map_name which looks for proper pattern of
form: "/tmp/perf-$PID.map" for these checks.
Signed-off-by: Athira Rajeev <atrajeev@linux.vnet.ibm.com>
Reviewed-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: akanksha@linux.ibm.com
Cc: kjain@linux.ibm.com
Cc: maddy@linux.ibm.com
Cc: disgoel@linux.vnet.ibm.com
Cc: linuxppc-dev@lists.ozlabs.org
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Link: https://lore.kernel.org/r/20240623064850.83720-2-atrajeev@linux.vnet.ibm.com

b9241f15

tools/perf: Fix the string match for "/tmp/perf-$PID.map" files in dso__load · b0979f00

Athira Rajeev authored Jun 23, 2024

Perf test for perf probe of function from different CU fails
as below:

	./perf test -vv "test perf probe of function from different CU"
	116: test perf probe of function from different CU:
	--- start ---
	test child forked, pid 2679
	Failed to find symbol foo in /tmp/perf-uprobe-different-cu-sh.Msa7iy89bx/testfile
	  Error: Failed to add events.
	--- Cleaning up ---
	"foo" does not hit any event.
	  Error: Failed to delete events.
	---- end(-1) ----
	116: test perf probe of function from different CU                   : FAILED!

The test does below to probe function "foo" :

	# gcc -g -Og -flto -c /tmp/perf-uprobe-different-cu-sh.XniNxNEVT7/testfile-foo.c
	-o /tmp/perf-uprobe-different-cu-sh.XniNxNEVT7/testfile-foo.o
	# gcc -g -Og -c /tmp/perf-uprobe-different-cu-sh.XniNxNEVT7/testfile-main.c
	-o /tmp/perf-uprobe-different-cu-sh.XniNxNEVT7/testfile-main.o
	# gcc -g -Og -o /tmp/perf-uprobe-different-cu-sh.XniNxNEVT7/testfile
	/tmp/perf-uprobe-different-cu-sh.XniNxNEVT7/testfile-foo.o
	/tmp/perf-uprobe-different-cu-sh.XniNxNEVT7/testfile-main.o

	# ./perf probe -x /tmp/perf-uprobe-different-cu-sh.XniNxNEVT7/testfile foo
	Failed to find symbol foo in /tmp/perf-uprobe-different-cu-sh.XniNxNEVT7/testfile
	   Error: Failed to add events.

Perf probe fails to find symbol foo in the executable placed in
/tmp/perf-uprobe-different-cu-sh.XniNxNEVT7

Simple reproduce:

 # mktemp -d /tmp/perf-checkXXXXXXXXXX
   /tmp/perf-checkcWpuLRQI8j

 # gcc -g -o test test.c
 # cp test /tmp/perf-checkcWpuLRQI8j/
 # nm /tmp/perf-checkcWpuLRQI8j/test | grep foo
   00000000100006bc T foo

 # ./perf probe -x /tmp/perf-checkcWpuLRQI8j/test foo
   Failed to find symbol foo in /tmp/perf-checkcWpuLRQI8j/test
      Error: Failed to add events.

But it works with any files like /tmp/perf/test. Only for
patterns with "/tmp/perf-", this fails.

Further debugging, commit 80d496be ("perf report: Add support
for profiling JIT generated code") added support for profiling JIT
generated code. This patch handles dso's of form
"/tmp/perf-$PID.map" .

The check used "if (strncmp(self->name, "/tmp/perf-", 10) == 0)"
to match "/tmp/perf-$PID.map". With this commit, any dso in
/tmp/perf- folder will be considered separately for processing
(not only JIT created map files ). Fix this by changing the
string pattern to check for "/tmp/perf-%d.map". Add a helper
function is_perf_pid_map_name to do this check. In "struct dso",
dso->long_name holds the long name of the dso file. Since the
/tmp/perf-$PID.map check uses the complete name, use dso___long_name for
the string name.

With the fix,
	# ./perf test "test perf probe of function from different CU"
	117: test perf probe of function from different CU                   : Ok

Fixes: 56cbeacf ("perf probe: Add test for regression introduced by switch to die_get_decl_file()")
Signed-off-by: Athira Rajeev <atrajeev@linux.vnet.ibm.com>
Reviewed-by: Chaitanya S Prakash <chaitanyas.prakash@arm.com>
Reviewed-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: akanksha@linux.ibm.com
Cc: kjain@linux.ibm.com
Cc: maddy@linux.ibm.com
Cc: disgoel@linux.vnet.ibm.com
Cc: linuxppc-dev@lists.ozlabs.org
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Link: https://lore.kernel.org/r/20240623064850.83720-1-atrajeev@linux.vnet.ibm.com

b0979f00

24 Jun, 2024 1 commit

perf test: Make test_arm_callgraph_fp.sh more robust · ff16aeb9

James Clark authored Jun 12, 2024

The 2 second sleep can cause the test to fail on very slow network file
systems because Perf ends up being killed before it finishes starting
up.

Fix it by making the leafloop workload end after a fixed time like the
other workloads so there is no need to kill it after 2 seconds.

Also remove the 1 second start sampling delay because it is similarly
fragile. Instead, search through all samples for a matching one, rather
than just checking the first sample and hoping it's in the right place.

Fixes: cd6382d8 ("perf test arm64: Test unwinding using fame-pointer (fp) mode")
Signed-off-by: James Clark <james.clark@arm.com>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: German Gomez <german.gomez@arm.com>
Cc: Spoorthy S <spoorts2@in.ibm.com>
Cc: Kajol Jain <kjain@linux.ibm.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Link: https://lore.kernel.org/r/20240612140316.3006660-1-james.clark@arm.com

ff16aeb9

21 Jun, 2024 4 commits

perf build: Ensure libtraceevent and libtracefs versions have 3 components · 366e1740

Guilherme Amadio authored Jun 06, 2024

When either of these have a shorter version, like 1.8, the expression
that computes the version has a syntax error that can be seen in the
output of make:

expr: syntax error: missing argument after +

Link: https://bugs.gentoo.org/917559Reported-by: Peter Volkov <peter.volkov@gmail.com>
Signed-off-by: Guilherme Amadio <amadio@gentoo.org>
Reviewed-by: Leo Yan <leo.yan@arm.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Link: https://lore.kernel.org/r/20240606153625.2255470-3-amadio@gentoo.org

366e1740

perf build: Use pkg-config for feature check for libtrace{event,fs} · 0f0e1f44

Guilherme Amadio authored Jun 06, 2024

Needed to add required include directories for the feature detection
to succeed. The header tracefs.h is installed either into the include
directory /usr/include/tracefs/tracefs.h when using the Makefile, or
into /usr/include/libtracefs/tracefs.h when using meson to build
libtracefs. The header tracefs.h uses #include <event-parse.h> from
libtraceevent, so pkg-config needs to pick the correct include directory
for libtracefs and add the one for libtraceevent to succeed.

Note that in baa2ca59 the variable
LIBTRACEEVENT_DIR was introduced, and now the method to compile against
non-standard locations requires PKG_CONFIG_PATH to be set instead, which
works for both libtraceevent and libtracefs.
Signed-off-by: Guilherme Amadio <amadio@gentoo.org>
Reviewed-by: Leo Yan <leo.yan@arm.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Link: https://lore.kernel.org/r/20240606153625.2255470-2-amadio@gentoo.org

0f0e1f44

perf arm: Workaround ARM PMUs cpu maps having offline cpus · 5518063f

Ian Rogers authored Jun 06, 2024

When PMUs have a cpu map in the 'cpus' or 'cpumask' file, perf will
try to open events on those CPUs. ARM doesn't remove offline CPUs
meaning taking a CPU offline will cause perf commands to fail unless a
CPU map is passed on the command line.

More context in:
https://lore.kernel.org/lkml/20240603092812.46616-1-yangyicong@huawei.com/Reported-by: Yicong Yang <yangyicong@huawei.com>
Closes: https://lore.kernel.org/lkml/20240603092812.46616-2-yangyicong@huawei.com/Signed-off-by: Ian Rogers <irogers@google.com>
Tested-by: Yicong Yang <yangyicong@hisilicon.com>
Tested-by: Leo Yan <leo.yan@arm.com>
Cc: James Clark <james.clark@arm.com>
Cc: Suzuki K Poulose <suzuki.poulose@arm.com>
Cc: Will Deacon <will@kernel.org>
Cc: Mike Leach <mike.leach@linaro.org>
Cc: Leo Yan <leo.yan@linux.dev>
Cc: linux-arm-kernel@lists.infradead.org
Cc: coresight@lists.linaro.org
Cc: John Garry <john.g.garry@oracle.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Link: https://lore.kernel.org/r/20240607065343.695369-1-irogers@google.com

5518063f

perf stat: Fix the hard-coded metrics calculation on the hybrid · 3612ca8e

Kan Liang authored Jun 06, 2024

The hard-coded metrics is wrongly calculated on the hybrid machine.

$ perf stat -e cycles,instructions -a sleep 1

 Performance counter stats for 'system wide':

        18,205,487      cpu_atom/cycles/
         9,733,603      cpu_core/cycles/
         9,423,111      cpu_atom/instructions/     #  0.52  insn per cycle
         4,268,965      cpu_core/instructions/     #  0.23  insn per cycle

The insn per cycle for cpu_core should be 4,268,965 / 9,733,603 = 0.44.

When finding the metric events, the find_stat() doesn't take the PMU
type into account. The cpu_atom/cycles/ is wrongly used to calculate
the IPC of the cpu_core.

In the hard-coded metrics, the events from a different PMU are only
SW_CPU_CLOCK and SW_TASK_CLOCK. They both have the stat type,
STAT_NSECS. Except the SW CLOCK events, check the PMU type as well.

Fixes: 0a57b910 ("perf stat: Use counts rather than saved_value")
Reported-by: Khalil, Amiri <amiri.khalil@intel.com>
Reviewed-by: Ian Rogers <irogers@google.com>
Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: stable@vger.kernel.org
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Link: https://lore.kernel.org/r/20240606180316.4122904-1-kan.liang@linux.intel.com