* [PATCH 0/1] perf test: Add test for branch stack sampling @ 2022-06-15 13:09 German Gomez 2022-06-15 13:09 ` [PATCH] " German Gomez 0 siblings, 1 reply; 4+ messages in thread From: German Gomez @ 2022-06-15 13:09 UTC (permalink / raw) To: linux-kernel, linux-perf-users, acme Cc: German Gomez, Mark Rutland, Alexander Shishkin, Jiri Olsa, Namhyung Kim Hi, While testing Anshuman Khandual's branch stack sampling ABI, and BRBE driver ([1] and [2] respectively) I've been using this test to check the consistency between arches (x86 and Arm64). We might extend it with Arm64-specific tests once the BRBE driver has been reviewed and merged, but for now I think this is generic enough to cover both x86 LBR and Arm BRBE. Thanks, German [1] https://lore.kernel.org/linux-arm-kernel/20220610035101.424112-1-anshuman.khandual@arm.com/ [2] https://lore.kernel.org/all/20220613100119.684673-1-anshuman.khandual@arm.com/ German Gomez (1): perf test: Add self test for branch stack sampling tools/perf/tests/shell/lib/brstack/main.h | 15 ++++ tools/perf/tests/shell/lib/brstack/test.c | 25 +++++++ tools/perf/tests/shell/test_brstack.sh | 86 +++++++++++++++++++++++ 3 files changed, 126 insertions(+) create mode 100644 tools/perf/tests/shell/lib/brstack/main.h create mode 100644 tools/perf/tests/shell/lib/brstack/test.c create mode 100755 tools/perf/tests/shell/test_brstack.sh -- 2.25.1 ^ permalink raw reply [flat|nested] 4+ messages in thread
* [PATCH] perf test: Add test for branch stack sampling 2022-06-15 13:09 [PATCH 0/1] perf test: Add test for branch stack sampling German Gomez @ 2022-06-15 13:09 ` German Gomez 2022-06-27 16:38 ` Ian Rogers 0 siblings, 1 reply; 4+ messages in thread From: German Gomez @ 2022-06-15 13:09 UTC (permalink / raw) To: linux-kernel, linux-perf-users, acme Cc: German Gomez, Anshuman Khandual, Mark Rutland, Alexander Shishkin, Jiri Olsa, Namhyung Kim Add a self test for branch stack sampling, to check that we get the expected branch types, and filters behave as expected. Suggested-by: Anshuman Khandual <anshuman.khandual@arm.com> Signed-off-by: German Gomez <german.gomez@arm.com> --- tools/perf/tests/shell/lib/brstack/main.h | 16 +++++ tools/perf/tests/shell/lib/brstack/test.c | 24 +++++++ tools/perf/tests/shell/test_brstack.sh | 86 +++++++++++++++++++++++ 3 files changed, 126 insertions(+) create mode 100644 tools/perf/tests/shell/lib/brstack/main.h create mode 100644 tools/perf/tests/shell/lib/brstack/test.c create mode 100755 tools/perf/tests/shell/test_brstack.sh diff --git a/tools/perf/tests/shell/lib/brstack/main.h b/tools/perf/tests/shell/lib/brstack/main.h new file mode 100644 index 000000000..94d2665ec --- /dev/null +++ b/tools/perf/tests/shell/lib/brstack/main.h @@ -0,0 +1,16 @@ +// SPDX-License-Identifier: GPL-2.0 +#define BENCH_RUNS 99999 + +void bench(void); + +int main(void) +{ + int cnt = 0; + + while (1) { + if ((cnt++) > BENCH_RUNS) + break; + bench(); /* call */ + } /* branch (uncond) */ + return 0; +} diff --git a/tools/perf/tests/shell/lib/brstack/test.c b/tools/perf/tests/shell/lib/brstack/test.c new file mode 100644 index 000000000..8a2308901 --- /dev/null +++ b/tools/perf/tests/shell/lib/brstack/test.c @@ -0,0 +1,24 @@ +// SPDX-License-Identifier: GPL-2.0 +#include "main.h" + +int cnt; + +void bar(void) +{ +} /* return */ + +void foo(void) +{ + bar(); /* call */ +} /* return */ + +void bench(void) +{ + void (*foo_ind)(void) = foo; + + if ((cnt++) % 3) /* branch (cond) */ + foo(); /* call */ + + bar(); /* call */ + foo_ind(); /* call (ind) */ +} diff --git a/tools/perf/tests/shell/test_brstack.sh b/tools/perf/tests/shell/test_brstack.sh new file mode 100755 index 000000000..2b1a1b20a --- /dev/null +++ b/tools/perf/tests/shell/test_brstack.sh @@ -0,0 +1,86 @@ +#!/bin/sh +# Check branch stack sampling + +# SPDX-License-Identifier: GPL-2.0 +# German Gomez <german.gomez@arm.com>, 2022 + +set -e + +# we need a C compiler to build the test programs +# so bail if none is found +if ! [ -x "$(command -v cc)" ]; then + echo "failed: no compiler, install gcc" + exit 2 +fi + +# skip the test if the hardware doesn't support branch stack sampling +perf record -b -o- -- true > /dev/null || exit 2 + +TMPDIR=$(mktemp -d /tmp/__perf_test.program.XXXXX) + +cleanup() { + rm -rf $TMPDIR +} + +trap cleanup exit term int + +test_user_branches() { + echo + echo "Testing user branch stack sampling" + echo + + cc -fno-inline -g "$(dirname $0)/lib/brstack/test.c" -o $TMPDIR/a.out + + perf record -o $TMPDIR/perf.data -q --branch-filter any,save_type,u -- $TMPDIR/a.out + perf script -i $TMPDIR/perf.data --fields brstacksym | xargs -n1 > $TMPDIR/perf.script + + # example of branch entries: + # foo+0x14/bar+0x40/P/-/-/0/CALL + + set -x + egrep -m1 "^bench\+[^ ]*/foo\+[^ ]*/IND_CALL$" $TMPDIR/perf.script + egrep -m1 "^foo\+[^ ]*/bar\+[^ ]*/CALL$" $TMPDIR/perf.script + egrep -m1 "^bench\+[^ ]*/foo\+[^ ]*/CALL$" $TMPDIR/perf.script + egrep -m1 "^bench\+[^ ]*/bar\+[^ ]*/CALL$" $TMPDIR/perf.script + egrep -m1 "^bar\+[^ ]*/foo\+[^ ]*/RET$" $TMPDIR/perf.script + egrep -m1 "^foo\+[^ ]*/bench\+[^ ]*/RET$" $TMPDIR/perf.script + egrep -m1 "^bench\+[^ ]*/bench\+[^ ]*/COND$" $TMPDIR/perf.script + egrep -m1 "^main\+[^ ]*/main\+[^ ]*/UNCOND$" $TMPDIR/perf.script + set +x + + # some branch types are still not being tested: + # IND COND_CALL COND_RET SYSCALL SYSRET IRQ SERROR NO_TX +} + +test_filter() { + local filter=$1 + local expect=$2 + + echo + echo "Testing branch stack filtering permutation ($filter,$expect)" + echo + + cc -fno-inline -g "$(dirname $0)/lib/brstack/test.c" -o $TMPDIR/a.out + + perf record -o $TMPDIR/perf.data -q --branch-filter $filter,save_type,u -- $TMPDIR/a.out + perf script -i $TMPDIR/perf.data --fields brstack | xargs -n1 > $TMPDIR/perf.script + + # fail if we find any branch type that doesn't match any of the expected ones + # also consider UNKNOWN branch types (-) + if egrep -vm1 "^[^ ]*/($expect|-|( *))$" $TMPDIR/perf.script; then + return 1 + fi +} + +test_user_branches + +# first argument <arg0> is the argument passed to "--branch-stack <arg0>,save_type,u" +# second argument are the expected branch types for the given filter +test_filter "any_call" "CALL|IND_CALL|COND_CALL|SYSCALL|IRQ|FAULT_DATA|FAULT_INST" +test_filter "call" "CALL|SYSCALL" +test_filter "cond" "COND" +test_filter "any_ret" "RET|COND_RET|SYSRET|ERET" + +test_filter "call,cond" "CALL|SYSCALL|COND" +test_filter "any_call,cond" "CALL|IND_CALL|COND_CALL|IRQ|FAULT_DATA|FAULT_INST|SYSCALL|COND" +test_filter "cond,any_call,any_ret" "COND|CALL|IND_CALL|COND_CALL|SYSCALL|IRQ|FAULT_DATA|FAULT_INST|RET|COND_RET|SYSRET|ERET" -- 2.25.1 ^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] perf test: Add test for branch stack sampling 2022-06-15 13:09 ` [PATCH] " German Gomez @ 2022-06-27 16:38 ` Ian Rogers 2022-06-27 16:45 ` German Gomez 0 siblings, 1 reply; 4+ messages in thread From: Ian Rogers @ 2022-06-27 16:38 UTC (permalink / raw) To: German Gomez Cc: linux-kernel, linux-perf-users, acme, Anshuman Khandual, Mark Rutland, Alexander Shishkin, Jiri Olsa, Namhyung Kim On Wed, Jun 15, 2022 at 6:09 AM German Gomez <german.gomez@arm.com> wrote: > > Add a self test for branch stack sampling, to check that we get the > expected branch types, and filters behave as expected. > > Suggested-by: Anshuman Khandual <anshuman.khandual@arm.com> > Signed-off-by: German Gomez <german.gomez@arm.com> Love tests, thanks! There are already shell tests that compile C code but they do it by having the C code within the shell test, for example: https://git.kernel.org/pub/scm/linux/kernel/git/acme/linux.git/tree/tools/perf/tests/shell/pipe_test.sh?h=perf/core#n14 Having it this way I thinks means the tests can run properly when installed, as we don't install non-sh files: https://git.kernel.org/pub/scm/linux/kernel/git/acme/linux.git/tree/tools/perf/Makefile.perf?h=perf/core#n1016 Thanks, Ian > --- > tools/perf/tests/shell/lib/brstack/main.h | 16 +++++ > tools/perf/tests/shell/lib/brstack/test.c | 24 +++++++ > tools/perf/tests/shell/test_brstack.sh | 86 +++++++++++++++++++++++ > 3 files changed, 126 insertions(+) > create mode 100644 tools/perf/tests/shell/lib/brstack/main.h > create mode 100644 tools/perf/tests/shell/lib/brstack/test.c > create mode 100755 tools/perf/tests/shell/test_brstack.sh > > diff --git a/tools/perf/tests/shell/lib/brstack/main.h b/tools/perf/tests/shell/lib/brstack/main.h > new file mode 100644 > index 000000000..94d2665ec > --- /dev/null > +++ b/tools/perf/tests/shell/lib/brstack/main.h > @@ -0,0 +1,16 @@ > +// SPDX-License-Identifier: GPL-2.0 > +#define BENCH_RUNS 99999 > + > +void bench(void); > + > +int main(void) > +{ > + int cnt = 0; > + > + while (1) { > + if ((cnt++) > BENCH_RUNS) > + break; > + bench(); /* call */ > + } /* branch (uncond) */ > + return 0; > +} > diff --git a/tools/perf/tests/shell/lib/brstack/test.c b/tools/perf/tests/shell/lib/brstack/test.c > new file mode 100644 > index 000000000..8a2308901 > --- /dev/null > +++ b/tools/perf/tests/shell/lib/brstack/test.c > @@ -0,0 +1,24 @@ > +// SPDX-License-Identifier: GPL-2.0 > +#include "main.h" > + > +int cnt; > + > +void bar(void) > +{ > +} /* return */ > + > +void foo(void) > +{ > + bar(); /* call */ > +} /* return */ > + > +void bench(void) > +{ > + void (*foo_ind)(void) = foo; > + > + if ((cnt++) % 3) /* branch (cond) */ > + foo(); /* call */ > + > + bar(); /* call */ > + foo_ind(); /* call (ind) */ > +} > diff --git a/tools/perf/tests/shell/test_brstack.sh b/tools/perf/tests/shell/test_brstack.sh > new file mode 100755 > index 000000000..2b1a1b20a > --- /dev/null > +++ b/tools/perf/tests/shell/test_brstack.sh > @@ -0,0 +1,86 @@ > +#!/bin/sh > +# Check branch stack sampling > + > +# SPDX-License-Identifier: GPL-2.0 > +# German Gomez <german.gomez@arm.com>, 2022 > + > +set -e > + > +# we need a C compiler to build the test programs > +# so bail if none is found > +if ! [ -x "$(command -v cc)" ]; then > + echo "failed: no compiler, install gcc" > + exit 2 > +fi > + > +# skip the test if the hardware doesn't support branch stack sampling > +perf record -b -o- -- true > /dev/null || exit 2 > + > +TMPDIR=$(mktemp -d /tmp/__perf_test.program.XXXXX) > + > +cleanup() { > + rm -rf $TMPDIR > +} > + > +trap cleanup exit term int > + > +test_user_branches() { > + echo > + echo "Testing user branch stack sampling" > + echo > + > + cc -fno-inline -g "$(dirname $0)/lib/brstack/test.c" -o $TMPDIR/a.out > + > + perf record -o $TMPDIR/perf.data -q --branch-filter any,save_type,u -- $TMPDIR/a.out > + perf script -i $TMPDIR/perf.data --fields brstacksym | xargs -n1 > $TMPDIR/perf.script > + > + # example of branch entries: > + # foo+0x14/bar+0x40/P/-/-/0/CALL > + > + set -x > + egrep -m1 "^bench\+[^ ]*/foo\+[^ ]*/IND_CALL$" $TMPDIR/perf.script > + egrep -m1 "^foo\+[^ ]*/bar\+[^ ]*/CALL$" $TMPDIR/perf.script > + egrep -m1 "^bench\+[^ ]*/foo\+[^ ]*/CALL$" $TMPDIR/perf.script > + egrep -m1 "^bench\+[^ ]*/bar\+[^ ]*/CALL$" $TMPDIR/perf.script > + egrep -m1 "^bar\+[^ ]*/foo\+[^ ]*/RET$" $TMPDIR/perf.script > + egrep -m1 "^foo\+[^ ]*/bench\+[^ ]*/RET$" $TMPDIR/perf.script > + egrep -m1 "^bench\+[^ ]*/bench\+[^ ]*/COND$" $TMPDIR/perf.script > + egrep -m1 "^main\+[^ ]*/main\+[^ ]*/UNCOND$" $TMPDIR/perf.script > + set +x > + > + # some branch types are still not being tested: > + # IND COND_CALL COND_RET SYSCALL SYSRET IRQ SERROR NO_TX > +} > + > +test_filter() { > + local filter=$1 > + local expect=$2 > + > + echo > + echo "Testing branch stack filtering permutation ($filter,$expect)" > + echo > + > + cc -fno-inline -g "$(dirname $0)/lib/brstack/test.c" -o $TMPDIR/a.out > + > + perf record -o $TMPDIR/perf.data -q --branch-filter $filter,save_type,u -- $TMPDIR/a.out > + perf script -i $TMPDIR/perf.data --fields brstack | xargs -n1 > $TMPDIR/perf.script > + > + # fail if we find any branch type that doesn't match any of the expected ones > + # also consider UNKNOWN branch types (-) > + if egrep -vm1 "^[^ ]*/($expect|-|( *))$" $TMPDIR/perf.script; then > + return 1 > + fi > +} > + > +test_user_branches > + > +# first argument <arg0> is the argument passed to "--branch-stack <arg0>,save_type,u" > +# second argument are the expected branch types for the given filter > +test_filter "any_call" "CALL|IND_CALL|COND_CALL|SYSCALL|IRQ|FAULT_DATA|FAULT_INST" > +test_filter "call" "CALL|SYSCALL" > +test_filter "cond" "COND" > +test_filter "any_ret" "RET|COND_RET|SYSRET|ERET" > + > +test_filter "call,cond" "CALL|SYSCALL|COND" > +test_filter "any_call,cond" "CALL|IND_CALL|COND_CALL|IRQ|FAULT_DATA|FAULT_INST|SYSCALL|COND" > +test_filter "cond,any_call,any_ret" "COND|CALL|IND_CALL|COND_CALL|SYSCALL|IRQ|FAULT_DATA|FAULT_INST|RET|COND_RET|SYSRET|ERET" > -- > 2.25.1 > ^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] perf test: Add test for branch stack sampling 2022-06-27 16:38 ` Ian Rogers @ 2022-06-27 16:45 ` German Gomez 0 siblings, 0 replies; 4+ messages in thread From: German Gomez @ 2022-06-27 16:45 UTC (permalink / raw) To: Ian Rogers Cc: linux-kernel, linux-perf-users, acme, Anshuman Khandual, Mark Rutland, Alexander Shishkin, Jiri Olsa, Namhyung Kim On 27/06/2022 17:38, Ian Rogers wrote: > On Wed, Jun 15, 2022 at 6:09 AM German Gomez <german.gomez@arm.com> wrote: >> Add a self test for branch stack sampling, to check that we get the >> expected branch types, and filters behave as expected. >> >> Suggested-by: Anshuman Khandual <anshuman.khandual@arm.com> >> Signed-off-by: German Gomez <german.gomez@arm.com> > Love tests, thanks! There are already shell tests that compile C code > but they do it by having the C code within the shell test, for > example: > https://git.kernel.org/pub/scm/linux/kernel/git/acme/linux.git/tree/tools/perf/tests/shell/pipe_test.sh?h=perf/core#n14 > Having it this way I thinks means the tests can run properly when > installed, as we don't install non-sh files: > https://git.kernel.org/pub/scm/linux/kernel/git/acme/linux.git/tree/tools/perf/Makefile.perf?h=perf/core#n1016 Ah! thanks for pointing this out, Ian. I've embedded C code within shell tests before, but I wasn't aware of the install issue. We'll take care of this, thanks for the review! > > Thanks, > Ian > >> --- >> tools/perf/tests/shell/lib/brstack/main.h | 16 +++++ >> tools/perf/tests/shell/lib/brstack/test.c | 24 +++++++ >> tools/perf/tests/shell/test_brstack.sh | 86 +++++++++++++++++++++++ >> 3 files changed, 126 insertions(+) >> create mode 100644 tools/perf/tests/shell/lib/brstack/main.h >> create mode 100644 tools/perf/tests/shell/lib/brstack/test.c >> create mode 100755 tools/perf/tests/shell/test_brstack.sh >> >> diff --git a/tools/perf/tests/shell/lib/brstack/main.h b/tools/perf/tests/shell/lib/brstack/main.h >> new file mode 100644 >> index 000000000..94d2665ec >> --- /dev/null >> +++ b/tools/perf/tests/shell/lib/brstack/main.h >> @@ -0,0 +1,16 @@ >> +// SPDX-License-Identifier: GPL-2.0 >> +#define BENCH_RUNS 99999 >> + >> +void bench(void); >> + >> +int main(void) >> +{ >> + int cnt = 0; >> + >> + while (1) { >> + if ((cnt++) > BENCH_RUNS) >> + break; >> + bench(); /* call */ >> + } /* branch (uncond) */ >> + return 0; >> +} >> diff --git a/tools/perf/tests/shell/lib/brstack/test.c b/tools/perf/tests/shell/lib/brstack/test.c >> new file mode 100644 >> index 000000000..8a2308901 >> --- /dev/null >> +++ b/tools/perf/tests/shell/lib/brstack/test.c >> @@ -0,0 +1,24 @@ >> +// SPDX-License-Identifier: GPL-2.0 >> +#include "main.h" >> + >> +int cnt; >> + >> +void bar(void) >> +{ >> +} /* return */ >> + >> +void foo(void) >> +{ >> + bar(); /* call */ >> +} /* return */ >> + >> +void bench(void) >> +{ >> + void (*foo_ind)(void) = foo; >> + >> + if ((cnt++) % 3) /* branch (cond) */ >> + foo(); /* call */ >> + >> + bar(); /* call */ >> + foo_ind(); /* call (ind) */ >> +} >> diff --git a/tools/perf/tests/shell/test_brstack.sh b/tools/perf/tests/shell/test_brstack.sh >> new file mode 100755 >> index 000000000..2b1a1b20a >> --- /dev/null >> +++ b/tools/perf/tests/shell/test_brstack.sh >> @@ -0,0 +1,86 @@ >> +#!/bin/sh >> +# Check branch stack sampling >> + >> +# SPDX-License-Identifier: GPL-2.0 >> +# German Gomez <german.gomez@arm.com>, 2022 >> + >> +set -e >> + >> +# we need a C compiler to build the test programs >> +# so bail if none is found >> +if ! [ -x "$(command -v cc)" ]; then >> + echo "failed: no compiler, install gcc" >> + exit 2 >> +fi >> + >> +# skip the test if the hardware doesn't support branch stack sampling >> +perf record -b -o- -- true > /dev/null || exit 2 >> + >> +TMPDIR=$(mktemp -d /tmp/__perf_test.program.XXXXX) >> + >> +cleanup() { >> + rm -rf $TMPDIR >> +} >> + >> +trap cleanup exit term int >> + >> +test_user_branches() { >> + echo >> + echo "Testing user branch stack sampling" >> + echo >> + >> + cc -fno-inline -g "$(dirname $0)/lib/brstack/test.c" -o $TMPDIR/a.out >> + >> + perf record -o $TMPDIR/perf.data -q --branch-filter any,save_type,u -- $TMPDIR/a.out >> + perf script -i $TMPDIR/perf.data --fields brstacksym | xargs -n1 > $TMPDIR/perf.script >> + >> + # example of branch entries: >> + # foo+0x14/bar+0x40/P/-/-/0/CALL >> + >> + set -x >> + egrep -m1 "^bench\+[^ ]*/foo\+[^ ]*/IND_CALL$" $TMPDIR/perf.script >> + egrep -m1 "^foo\+[^ ]*/bar\+[^ ]*/CALL$" $TMPDIR/perf.script >> + egrep -m1 "^bench\+[^ ]*/foo\+[^ ]*/CALL$" $TMPDIR/perf.script >> + egrep -m1 "^bench\+[^ ]*/bar\+[^ ]*/CALL$" $TMPDIR/perf.script >> + egrep -m1 "^bar\+[^ ]*/foo\+[^ ]*/RET$" $TMPDIR/perf.script >> + egrep -m1 "^foo\+[^ ]*/bench\+[^ ]*/RET$" $TMPDIR/perf.script >> + egrep -m1 "^bench\+[^ ]*/bench\+[^ ]*/COND$" $TMPDIR/perf.script >> + egrep -m1 "^main\+[^ ]*/main\+[^ ]*/UNCOND$" $TMPDIR/perf.script >> + set +x >> + >> + # some branch types are still not being tested: >> + # IND COND_CALL COND_RET SYSCALL SYSRET IRQ SERROR NO_TX >> +} >> + >> +test_filter() { >> + local filter=$1 >> + local expect=$2 >> + >> + echo >> + echo "Testing branch stack filtering permutation ($filter,$expect)" >> + echo >> + >> + cc -fno-inline -g "$(dirname $0)/lib/brstack/test.c" -o $TMPDIR/a.out >> + >> + perf record -o $TMPDIR/perf.data -q --branch-filter $filter,save_type,u -- $TMPDIR/a.out >> + perf script -i $TMPDIR/perf.data --fields brstack | xargs -n1 > $TMPDIR/perf.script >> + >> + # fail if we find any branch type that doesn't match any of the expected ones >> + # also consider UNKNOWN branch types (-) >> + if egrep -vm1 "^[^ ]*/($expect|-|( *))$" $TMPDIR/perf.script; then >> + return 1 >> + fi >> +} >> + >> +test_user_branches >> + >> +# first argument <arg0> is the argument passed to "--branch-stack <arg0>,save_type,u" >> +# second argument are the expected branch types for the given filter >> +test_filter "any_call" "CALL|IND_CALL|COND_CALL|SYSCALL|IRQ|FAULT_DATA|FAULT_INST" >> +test_filter "call" "CALL|SYSCALL" >> +test_filter "cond" "COND" >> +test_filter "any_ret" "RET|COND_RET|SYSRET|ERET" >> + >> +test_filter "call,cond" "CALL|SYSCALL|COND" >> +test_filter "any_call,cond" "CALL|IND_CALL|COND_CALL|IRQ|FAULT_DATA|FAULT_INST|SYSCALL|COND" >> +test_filter "cond,any_call,any_ret" "COND|CALL|IND_CALL|COND_CALL|SYSCALL|IRQ|FAULT_DATA|FAULT_INST|RET|COND_RET|SYSRET|ERET" >> -- >> 2.25.1 >> ^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2022-06-27 16:45 UTC | newest] Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2022-06-15 13:09 [PATCH 0/1] perf test: Add test for branch stack sampling German Gomez 2022-06-15 13:09 ` [PATCH] " German Gomez 2022-06-27 16:38 ` Ian Rogers 2022-06-27 16:45 ` German Gomez
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