| Message ID | 172377547205.67914.494998437883733530.stgit@devnote2 (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | tracing: Support poll on event hist file | expand |
On 8/15/24 20:31, Masami Hiramatsu (Google) wrote: > From: Masami Hiramatsu (Google) <mhiramat@kernel.org> > > Add a testcase for poll() on hist file. This introduces a helper binary > to the ftracetest, because there is no good way to reliably execute > poll() on hist file. > > Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org> > --- > Changes in v4: > - Use getopt() in poll.c (command options are changed) > - Update test code according to the new command options. > Changes in v2: > - Update poll command to support both of POLLIN and POLLPRI, and timeout. > - Identify unsupported stable kernel if poll-in returns soon. > - Test both of POLLIN and POLLPRI. > --- > tools/testing/selftests/ftrace/Makefile | 2 + > tools/testing/selftests/ftrace/poll.c | 74 ++++++++++++++++++++ > .../ftrace/test.d/trigger/trigger-hist-poll.tc | 74 ++++++++++++++++++++ > 3 files changed, 150 insertions(+) > create mode 100644 tools/testing/selftests/ftrace/poll.c > create mode 100644 tools/testing/selftests/ftrace/test.d/trigger/trigger-hist-poll.tc > > diff --git a/tools/testing/selftests/ftrace/Makefile b/tools/testing/selftests/ftrace/Makefile > index a1e955d2de4c..49d96bb16355 100644 > --- a/tools/testing/selftests/ftrace/Makefile > +++ b/tools/testing/selftests/ftrace/Makefile > @@ -6,4 +6,6 @@ TEST_PROGS := ftracetest-ktap > TEST_FILES := test.d settings > EXTRA_CLEAN := $(OUTPUT)/logs/* > > +TEST_GEN_PROGS = poll > + > include ../lib.mk > diff --git a/tools/testing/selftests/ftrace/poll.c b/tools/testing/selftests/ftrace/poll.c > new file mode 100644 > index 000000000000..584f159654b1 > --- /dev/null > +++ b/tools/testing/selftests/ftrace/poll.c > @@ -0,0 +1,74 @@ > +// SPDX-License-Identifier: GPL-2.0 > +/* > + * Simple poll on a file. > + * > + * Copyright (c) 2024 Google LLC. > + */ > + > +#include <errno.h> > +#include <fcntl.h> > +#include <poll.h> > +#include <stdio.h> > +#include <stdlib.h> > +#include <string.h> > +#include <unistd.h> > + > +#define BUFSIZE 4096 > + > +/* > + * Usage: > + * poll [-I|-P] [-t timeout] FILE > + */ > +int main(int argc, char *argv[]) > +{ > + struct pollfd pfd = {.events = POLLIN}; > + char buf[BUFSIZE]; > + int timeout = -1; > + int ret, opt; > + > + while ((opt = getopt(argc, argv, "IPt:")) != -1) { > + switch (opt) { > + case 'I': > + pfd.events = POLLIN; > + break; > + case 'P': > + pfd.events = POLLPRI; > + break; > + case 't': > + timeout = atoi(optarg); > + break; > + default: > + fprintf(stderr, "Usage: %s [-I|-P] [-t timeout] FILE\n", > + argv[0]); > + return -1; > + } > + } > + if (optind >= argc) { > + fprintf(stderr, "Error: Polling file is not specified\n"); > + return -1; > + } > + > + pfd.fd = open(argv[optind], O_RDONLY); > + if (pfd.fd < 0) { > + fprintf(stderr, "failed to open %s", argv[optind]); > + perror("open"); > + return -1; > + } > + > + /* Reset poll by read if POLLIN is specified. */ > + if (pfd.events & POLLIN) > + do {} while (read(pfd.fd, buf, BUFSIZE) == BUFSIZE); > + > + ret = poll(&pfd, 1, timeout); > + if (ret < 0 && errno != EINTR) { > + perror("poll"); > + return -1; > + } > + close(pfd.fd); > + > + /* If timeout happned, return code is 0 */ Looks like you missed this one :) Otherwise looks good to me. With this fixed Reviewed-by: Shuah Khan <skhan@linuxfoundation.org> thanks, -- Shuah
On Fri, 16 Aug 2024 08:04:41 -0600 Shuah Khan <skhan@linuxfoundation.org> wrote: > On 8/15/24 20:31, Masami Hiramatsu (Google) wrote: > > From: Masami Hiramatsu (Google) <mhiramat@kernel.org> > > > > Add a testcase for poll() on hist file. This introduces a helper binary > > to the ftracetest, because there is no good way to reliably execute > > poll() on hist file. > > > > Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org> > > --- > > Changes in v4: > > - Use getopt() in poll.c (command options are changed) > > - Update test code according to the new command options. > > Changes in v2: > > - Update poll command to support both of POLLIN and POLLPRI, and timeout. > > - Identify unsupported stable kernel if poll-in returns soon. > > - Test both of POLLIN and POLLPRI. > > --- > > tools/testing/selftests/ftrace/Makefile | 2 + > > tools/testing/selftests/ftrace/poll.c | 74 ++++++++++++++++++++ > > .../ftrace/test.d/trigger/trigger-hist-poll.tc | 74 ++++++++++++++++++++ > > 3 files changed, 150 insertions(+) > > create mode 100644 tools/testing/selftests/ftrace/poll.c > > create mode 100644 tools/testing/selftests/ftrace/test.d/trigger/trigger-hist-poll.tc > > > > diff --git a/tools/testing/selftests/ftrace/Makefile b/tools/testing/selftests/ftrace/Makefile > > index a1e955d2de4c..49d96bb16355 100644 > > --- a/tools/testing/selftests/ftrace/Makefile > > +++ b/tools/testing/selftests/ftrace/Makefile > > @@ -6,4 +6,6 @@ TEST_PROGS := ftracetest-ktap > > TEST_FILES := test.d settings > > EXTRA_CLEAN := $(OUTPUT)/logs/* > > > > +TEST_GEN_PROGS = poll > > + > > include ../lib.mk > > diff --git a/tools/testing/selftests/ftrace/poll.c b/tools/testing/selftests/ftrace/poll.c > > new file mode 100644 > > index 000000000000..584f159654b1 > > --- /dev/null > > +++ b/tools/testing/selftests/ftrace/poll.c > > @@ -0,0 +1,74 @@ > > +// SPDX-License-Identifier: GPL-2.0 > > +/* > > + * Simple poll on a file. > > + * > > + * Copyright (c) 2024 Google LLC. > > + */ > > + > > +#include <errno.h> > > +#include <fcntl.h> > > +#include <poll.h> > > +#include <stdio.h> > > +#include <stdlib.h> > > +#include <string.h> > > +#include <unistd.h> > > + > > +#define BUFSIZE 4096 > > + > > +/* > > + * Usage: > > + * poll [-I|-P] [-t timeout] FILE > > + */ > > +int main(int argc, char *argv[]) > > +{ > > + struct pollfd pfd = {.events = POLLIN}; > > + char buf[BUFSIZE]; > > + int timeout = -1; > > + int ret, opt; > > + > > + while ((opt = getopt(argc, argv, "IPt:")) != -1) { > > + switch (opt) { > > + case 'I': > > + pfd.events = POLLIN; > > + break; > > + case 'P': > > + pfd.events = POLLPRI; > > + break; > > + case 't': > > + timeout = atoi(optarg); > > + break; > > + default: > > + fprintf(stderr, "Usage: %s [-I|-P] [-t timeout] FILE\n", > > + argv[0]); > > + return -1; > > + } > > + } > > + if (optind >= argc) { > > + fprintf(stderr, "Error: Polling file is not specified\n"); > > + return -1; > > + } > > + > > + pfd.fd = open(argv[optind], O_RDONLY); > > + if (pfd.fd < 0) { > > + fprintf(stderr, "failed to open %s", argv[optind]); > > + perror("open"); > > + return -1; > > + } > > + > > + /* Reset poll by read if POLLIN is specified. */ > > + if (pfd.events & POLLIN) > > + do {} while (read(pfd.fd, buf, BUFSIZE) == BUFSIZE); > > + > > + ret = poll(&pfd, 1, timeout); > > + if (ret < 0 && errno != EINTR) { > > + perror("poll"); > > + return -1; > > + } > > + close(pfd.fd); > > + > > + /* If timeout happned, return code is 0 */ > > Looks like you missed this one :) Otherwise looks good to me. > Oops, indeed. > With this fixed > > Reviewed-by: Shuah Khan <skhan@linuxfoundation.org> Thanks! > > thanks, > -- Shuah
On Sun, 18 Aug 2024 00:06:20 +0900 Masami Hiramatsu (Google) <mhiramat@kernel.org> wrote: > On Fri, 16 Aug 2024 08:04:41 -0600 > Shuah Khan <skhan@linuxfoundation.org> wrote: > > > On 8/15/24 20:31, Masami Hiramatsu (Google) wrote: > > > From: Masami Hiramatsu (Google) <mhiramat@kernel.org> > > > > > > Add a testcase for poll() on hist file. This introduces a helper binary > > > to the ftracetest, because there is no good way to reliably execute > > > poll() on hist file. > > > > > > Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org> > > > --- > > > Changes in v4: > > > - Use getopt() in poll.c (command options are changed) > > > - Update test code according to the new command options. > > > Changes in v2: > > > - Update poll command to support both of POLLIN and POLLPRI, and timeout. > > > - Identify unsupported stable kernel if poll-in returns soon. > > > - Test both of POLLIN and POLLPRI. > > > --- > > > tools/testing/selftests/ftrace/Makefile | 2 + > > > tools/testing/selftests/ftrace/poll.c | 74 ++++++++++++++++++++ > > > .../ftrace/test.d/trigger/trigger-hist-poll.tc | 74 ++++++++++++++++++++ > > > 3 files changed, 150 insertions(+) > > > create mode 100644 tools/testing/selftests/ftrace/poll.c > > > create mode 100644 tools/testing/selftests/ftrace/test.d/trigger/trigger-hist-poll.tc > > > > > > diff --git a/tools/testing/selftests/ftrace/Makefile b/tools/testing/selftests/ftrace/Makefile > > > index a1e955d2de4c..49d96bb16355 100644 > > > --- a/tools/testing/selftests/ftrace/Makefile > > > +++ b/tools/testing/selftests/ftrace/Makefile > > > @@ -6,4 +6,6 @@ TEST_PROGS := ftracetest-ktap > > > TEST_FILES := test.d settings > > > EXTRA_CLEAN := $(OUTPUT)/logs/* > > > > > > +TEST_GEN_PROGS = poll > > > + > > > include ../lib.mk > > > diff --git a/tools/testing/selftests/ftrace/poll.c b/tools/testing/selftests/ftrace/poll.c > > > new file mode 100644 > > > index 000000000000..584f159654b1 > > > --- /dev/null > > > +++ b/tools/testing/selftests/ftrace/poll.c > > > @@ -0,0 +1,74 @@ > > > +// SPDX-License-Identifier: GPL-2.0 > > > +/* > > > + * Simple poll on a file. > > > + * > > > + * Copyright (c) 2024 Google LLC. > > > + */ > > > + > > > +#include <errno.h> > > > +#include <fcntl.h> > > > +#include <poll.h> > > > +#include <stdio.h> > > > +#include <stdlib.h> > > > +#include <string.h> > > > +#include <unistd.h> > > > + > > > +#define BUFSIZE 4096 > > > + > > > +/* > > > + * Usage: > > > + * poll [-I|-P] [-t timeout] FILE > > > + */ > > > +int main(int argc, char *argv[]) > > > +{ > > > + struct pollfd pfd = {.events = POLLIN}; > > > + char buf[BUFSIZE]; > > > + int timeout = -1; > > > + int ret, opt; > > > + > > > + while ((opt = getopt(argc, argv, "IPt:")) != -1) { > > > + switch (opt) { > > > + case 'I': > > > + pfd.events = POLLIN; > > > + break; > > > + case 'P': > > > + pfd.events = POLLPRI; > > > + break; > > > + case 't': > > > + timeout = atoi(optarg); > > > + break; > > > + default: > > > + fprintf(stderr, "Usage: %s [-I|-P] [-t timeout] FILE\n", > > > + argv[0]); > > > + return -1; > > > + } > > > + } > > > + if (optind >= argc) { > > > + fprintf(stderr, "Error: Polling file is not specified\n"); > > > + return -1; > > > + } > > > + > > > + pfd.fd = open(argv[optind], O_RDONLY); > > > + if (pfd.fd < 0) { > > > + fprintf(stderr, "failed to open %s", argv[optind]); > > > + perror("open"); > > > + return -1; > > > + } > > > + > > > + /* Reset poll by read if POLLIN is specified. */ > > > + if (pfd.events & POLLIN) > > > + do {} while (read(pfd.fd, buf, BUFSIZE) == BUFSIZE); > > > + > > > + ret = poll(&pfd, 1, timeout); > > > + if (ret < 0 && errno != EINTR) { > > > + perror("poll"); > > > + return -1; > > > + } > > > + close(pfd.fd); > > > + > > > + /* If timeout happned, return code is 0 */ > > > > Looks like you missed this one :) Otherwise looks good to me. > > > Oops, indeed. Hm, this comment is correct but misleadable. I meant that the poll() returns 0 if timeout happens. ----- RETURN VALUE On success, poll() returns a nonnegative value which is the number of elements in the pollfds whose revents fields have been set to a nonzero value (indicating an event or an error). A return value of zero indicates that the system call timed out before any file descriptors became read. ----- But the comment should tell what this command does. Thanks, > > > With this fixed > > > > Reviewed-by: Shuah Khan <skhan@linuxfoundation.org> > > Thanks! > > > > > thanks, > > -- Shuah > > > -- > Masami Hiramatsu (Google) <mhiramat@kernel.org>
diff --git a/tools/testing/selftests/ftrace/Makefile b/tools/testing/selftests/ftrace/Makefile index a1e955d2de4c..49d96bb16355 100644 --- a/tools/testing/selftests/ftrace/Makefile +++ b/tools/testing/selftests/ftrace/Makefile @@ -6,4 +6,6 @@ TEST_PROGS := ftracetest-ktap TEST_FILES := test.d settings EXTRA_CLEAN := $(OUTPUT)/logs/* +TEST_GEN_PROGS = poll + include ../lib.mk diff --git a/tools/testing/selftests/ftrace/poll.c b/tools/testing/selftests/ftrace/poll.c new file mode 100644 index 000000000000..584f159654b1 --- /dev/null +++ b/tools/testing/selftests/ftrace/poll.c @@ -0,0 +1,74 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Simple poll on a file. + * + * Copyright (c) 2024 Google LLC. + */ + +#include <errno.h> +#include <fcntl.h> +#include <poll.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> + +#define BUFSIZE 4096 + +/* + * Usage: + * poll [-I|-P] [-t timeout] FILE + */ +int main(int argc, char *argv[]) +{ + struct pollfd pfd = {.events = POLLIN}; + char buf[BUFSIZE]; + int timeout = -1; + int ret, opt; + + while ((opt = getopt(argc, argv, "IPt:")) != -1) { + switch (opt) { + case 'I': + pfd.events = POLLIN; + break; + case 'P': + pfd.events = POLLPRI; + break; + case 't': + timeout = atoi(optarg); + break; + default: + fprintf(stderr, "Usage: %s [-I|-P] [-t timeout] FILE\n", + argv[0]); + return -1; + } + } + if (optind >= argc) { + fprintf(stderr, "Error: Polling file is not specified\n"); + return -1; + } + + pfd.fd = open(argv[optind], O_RDONLY); + if (pfd.fd < 0) { + fprintf(stderr, "failed to open %s", argv[optind]); + perror("open"); + return -1; + } + + /* Reset poll by read if POLLIN is specified. */ + if (pfd.events & POLLIN) + do {} while (read(pfd.fd, buf, BUFSIZE) == BUFSIZE); + + ret = poll(&pfd, 1, timeout); + if (ret < 0 && errno != EINTR) { + perror("poll"); + return -1; + } + close(pfd.fd); + + /* If timeout happned, return code is 0 */ + if (ret == 0) + return 1; + + return 0; +} diff --git a/tools/testing/selftests/ftrace/test.d/trigger/trigger-hist-poll.tc b/tools/testing/selftests/ftrace/test.d/trigger/trigger-hist-poll.tc new file mode 100644 index 000000000000..cbd01a71ecad --- /dev/null +++ b/tools/testing/selftests/ftrace/test.d/trigger/trigger-hist-poll.tc @@ -0,0 +1,74 @@ +#!/bin/sh +# SPDX-License-Identifier: GPL-2.0 +# description: event trigger - test poll wait on histogram +# requires: set_event events/sched/sched_process_free/trigger events/sched/sched_process_free/hist +# flags: instance + +POLL=${FTRACETEST_ROOT}/poll + +if [ ! -x ${POLL} ]; then + echo "poll program is not compiled!" + exit_unresolved +fi + +EVENT=events/sched/sched_process_free/ + +# Check poll ops is supported. Before implementing poll on hist file, it +# returns soon with POLLIN | POLLOUT, but not POLLPRI. + +# This must wait >1 sec and return 1 (timeout). +set +e +${POLL} -I -t 1000 ${EVENT}/hist +ret=$? +set -e +if [ ${ret} != 1 ]; then + echo "poll on hist file is not supported" + exit_unsupported +fi + +# Test POLLIN +echo > trace +echo "hist:key=comm" > ${EVENT}/trigger +echo 1 > ${EVENT}/enable + +# This sleep command will exit after 2 seconds. +sleep 2 & +BGPID=$! +# if timeout happens, poll returns 1. +${POLL} -I -t 4000 ${EVENT}/hist +echo 0 > tracing_on + +if [ -d /proc/${BGPID} ]; then + echo "poll exits too soon" + kill -KILL ${BGPID} ||: + exit_fail +fi + +if ! grep -qw "sleep" trace; then + echo "poll exits before event happens" + exit_fail +fi + +# Test POLLPRI +echo > trace +echo 1 > tracing_on + +# This sleep command will exit after 2 seconds. +sleep 2 & +BGPID=$! +# if timeout happens, poll returns 1. +${POLL} -P -t 4000 ${EVENT}/hist +echo 0 > tracing_on + +if [ -d /proc/${BGPID} ]; then + echo "poll exits too soon" + kill -KILL ${BGPID} ||: + exit_fail +fi + +if ! grep -qw "sleep" trace; then + echo "poll exits before event happens" + exit_fail +fi + +exit_pass