| Message ID | 20240111161712.1480333-6-vdonnefort@google.com |
|---|---|
| State | Superseded |
| Headers | show |
| Series | None | expand |
On Thu, 11 Jan 2024 16:17:12 +0000 Vincent Donnefort <vdonnefort@google.com> wrote: > This test maps a ring-buffer and validate the meta-page after reset and > after emitting few events. > > Cc: Shuah Khan <shuah@kernel.org> > Cc: Shuah Khan <skhan@linuxfoundation.org> > Cc: linux-kselftest@vger.kernel.org > Signed-off-by: Vincent Donnefort <vdonnefort@google.com> Looks good to me and tested. Reviewed-by: Masami Hiramatsu (Google) <mhiramat@kernel.org> Tested-by: Masami Hiramatsu (Google) <mhiramat@kernel.org> Thank you, > > diff --git a/tools/testing/selftests/ring-buffer/Makefile b/tools/testing/selftests/ring-buffer/Makefile > new file mode 100644 > index 000000000000..627c5fa6d1ab > --- /dev/null > +++ b/tools/testing/selftests/ring-buffer/Makefile > @@ -0,0 +1,8 @@ > +# SPDX-License-Identifier: GPL-2.0 > +CFLAGS += -Wl,-no-as-needed -Wall > +CFLAGS += $(KHDR_INCLUDES) > +CFLAGS += -D_GNU_SOURCE > + > +TEST_GEN_PROGS = map_test > + > +include ../lib.mk > diff --git a/tools/testing/selftests/ring-buffer/config b/tools/testing/selftests/ring-buffer/config > new file mode 100644 > index 000000000000..ef8214661612 > --- /dev/null > +++ b/tools/testing/selftests/ring-buffer/config > @@ -0,0 +1 @@ > +CONFIG_FTRACE=y > diff --git a/tools/testing/selftests/ring-buffer/map_test.c b/tools/testing/selftests/ring-buffer/map_test.c > new file mode 100644 > index 000000000000..49107e8da5e9 > --- /dev/null > +++ b/tools/testing/selftests/ring-buffer/map_test.c > @@ -0,0 +1,188 @@ > +// SPDX-License-Identifier: GPL-2.0 > +/* > + * Ring-buffer memory mapping tests > + * > + * Copyright (c) 2024 Vincent Donnefort <vdonnefort@google.com> > + */ > +#include <fcntl.h> > +#include <sched.h> > +#include <stdbool.h> > +#include <stdio.h> > +#include <stdlib.h> > +#include <unistd.h> > + > +#include <linux/trace_mmap.h> > + > +#include <sys/mman.h> > +#include <sys/ioctl.h> > + > +#include "../user_events/user_events_selftests.h" /* share tracefs setup */ > +#include "../kselftest_harness.h" > + > +#define TRACEFS_ROOT "/sys/kernel/tracing" > + > +static int __tracefs_write(const char *path, const char *value) > +{ > + FILE *file; > + > + file = fopen(path, "w"); > + if (!file) > + return -1; > + > + fputs(value, file); > + fclose(file); > + > + return 0; > +} > + > +static int __tracefs_write_int(const char *path, int value) > +{ > + char *str; > + int ret; > + > + if (asprintf(&str, "%d", value) < 0) > + return -1; > + > + ret = __tracefs_write(path, str); > + > + free(str); > + > + return ret; > +} > + > +#define tracefs_write_int(path, value) \ > + ASSERT_EQ(__tracefs_write_int((path), (value)), 0) > + > +static int tracefs_reset(void) > +{ > + if (__tracefs_write_int(TRACEFS_ROOT"/tracing_on", 0)) > + return -1; > + if (__tracefs_write_int(TRACEFS_ROOT"/trace", 0)) > + return -1; > + if (__tracefs_write(TRACEFS_ROOT"/set_event", "")) > + return -1; > + > + return 0; > +} > + > +FIXTURE(map) { > + struct trace_buffer_meta *meta; > + void *data; > + int cpu_fd; > + bool umount; > +}; > + > +FIXTURE_VARIANT(map) { > + int subbuf_size; > +}; > + > +FIXTURE_VARIANT_ADD(map, subbuf_size_4k) { > + .subbuf_size = 4, > +}; > + > +FIXTURE_VARIANT_ADD(map, subbuf_size_8k) { > + .subbuf_size = 8, > +}; > + > +FIXTURE_SETUP(map) > +{ > + int cpu = sched_getcpu(), page_size = getpagesize(); > + unsigned long meta_len, data_len; > + char *cpu_path, *message; > + bool fail, umount; > + cpu_set_t cpu_mask; > + void *map; > + > + if (!tracefs_enabled(&message, &fail, &umount)) { > + if (fail) { > + TH_LOG("Tracefs setup failed: %s", message); > + ASSERT_FALSE(fail); > + } > + SKIP(return, "Skipping: %s", message); > + } > + > + self->umount = umount; > + > + ASSERT_GE(cpu, 0); > + > + ASSERT_EQ(tracefs_reset(), 0); > + > + tracefs_write_int(TRACEFS_ROOT"/buffer_subbuf_size_kb", variant->subbuf_size); > + > + ASSERT_GE(asprintf(&cpu_path, > + TRACEFS_ROOT"/per_cpu/cpu%d/trace_pipe_raw", > + cpu), 0); > + > + self->cpu_fd = open(cpu_path, O_RDONLY | O_NONBLOCK); > + ASSERT_GE(self->cpu_fd, 0); > + free(cpu_path); > + > + map = mmap(NULL, page_size, PROT_READ, MAP_SHARED, self->cpu_fd, 0); > + ASSERT_NE(map, MAP_FAILED); > + self->meta = (struct trace_buffer_meta *)map; > + > + meta_len = self->meta->meta_page_size; > + data_len = self->meta->subbuf_size * self->meta->nr_subbufs; > + > + map = mmap(NULL, data_len, PROT_READ, MAP_SHARED, self->cpu_fd, meta_len); > + ASSERT_NE(map, MAP_FAILED); > + self->data = map; > + > + /* > + * Ensure generated events will be found on this very same ring-buffer. > + */ > + CPU_ZERO(&cpu_mask); > + CPU_SET(cpu, &cpu_mask); > + ASSERT_EQ(sched_setaffinity(0, sizeof(cpu_mask), &cpu_mask), 0); > +} > + > +FIXTURE_TEARDOWN(map) > +{ > + tracefs_reset(); > + > + if (self->umount) > + tracefs_unmount(); > + > + munmap(self->data, self->meta->subbuf_size * self->meta->nr_subbufs); > + munmap(self->meta, self->meta->meta_page_size); > + close(self->cpu_fd); > +} > + > +TEST_F(map, meta_page_check) > +{ > + int cnt = 0; > + > + ASSERT_EQ(self->meta->entries, 0); > + ASSERT_EQ(self->meta->overrun, 0); > + ASSERT_EQ(self->meta->read, 0); > + ASSERT_EQ(self->meta->subbufs_touched, 0); > + ASSERT_EQ(self->meta->subbufs_lost, 0); > + ASSERT_EQ(self->meta->subbufs_read, 0); > + > + ASSERT_EQ(self->meta->reader.id, 0); > + ASSERT_EQ(self->meta->reader.read, 0); > + > + ASSERT_EQ(ioctl(self->cpu_fd, TRACE_MMAP_IOCTL_GET_READER), 0); > + ASSERT_EQ(self->meta->reader.id, 0); > + > + tracefs_write_int(TRACEFS_ROOT"/tracing_on", 1); > + for (int i = 0; i < 16; i++) > + tracefs_write_int(TRACEFS_ROOT"/trace_marker", i); > +again: > + ASSERT_EQ(ioctl(self->cpu_fd, TRACE_MMAP_IOCTL_GET_READER), 0); > + > + ASSERT_EQ(self->meta->entries, 16); > + ASSERT_EQ(self->meta->overrun, 0); > + ASSERT_EQ(self->meta->read, 16); > + /* subbufs_touched doesn't take into account the commit page */ > + ASSERT_EQ(self->meta->subbufs_touched, 0); > + ASSERT_EQ(self->meta->subbufs_lost, 0); > + ASSERT_EQ(self->meta->subbufs_read, 1); > + > + ASSERT_EQ(self->meta->reader.id, 1); > + > + if (!(cnt++)) > + goto again; > +} > + > +TEST_HARNESS_MAIN > -- > 2.43.0.275.g3460e3d667-goog >
Hi Vincent, On Sat, 13 Jan 2024 22:39:46 +0900 Masami Hiramatsu (Google) <mhiramat@kernel.org> wrote: > On Thu, 11 Jan 2024 16:17:12 +0000 > Vincent Donnefort <vdonnefort@google.com> wrote: > > > This test maps a ring-buffer and validate the meta-page after reset and > > after emitting few events. > > > > Cc: Shuah Khan <shuah@kernel.org> > > Cc: Shuah Khan <skhan@linuxfoundation.org> > > Cc: linux-kselftest@vger.kernel.org > > Signed-off-by: Vincent Donnefort <vdonnefort@google.com> > > Looks good to me and tested. > > Reviewed-by: Masami Hiramatsu (Google) <mhiramat@kernel.org> > Tested-by: Masami Hiramatsu (Google) <mhiramat@kernel.org> Sorry, I should cancel these. I found this test did not pass if I set the function tracer on. / # cd /sys/kernel/tracing/ /sys/kernel/tracing # echo function > current_tracer /sys/kernel/tracing # /mnt/map_test TAP version 13 1..2 # Starting 2 tests from 2 test cases. # RUN map.subbuf_size_4k.meta_page_check ... # map_test.c:174:meta_page_check:Expected self->meta->entries (15293) == 16 (16) # meta_page_check: Test terminated by assertion # FAIL map.subbuf_size_4k.meta_page_check not ok 1 map.subbuf_size_4k.meta_page_check # RUN map.subbuf_size_8k.meta_page_check ... # map_test.c:174:meta_page_check:Expected self->meta->entries (15270) == 16 (16) # meta_page_check: Test terminated by assertion # FAIL map.subbuf_size_8k.meta_page_check not ok 2 map.subbuf_size_8k.meta_page_check # FAILED: 0 / 2 tests passed. # Totals: pass:0 fail:2 xfail:0 xpass:0 skip:0 error:0 Does this depend on "nop" tracer? Thank you, > > Thank you, > > > > > diff --git a/tools/testing/selftests/ring-buffer/Makefile b/tools/testing/selftests/ring-buffer/Makefile > > new file mode 100644 > > index 000000000000..627c5fa6d1ab > > --- /dev/null > > +++ b/tools/testing/selftests/ring-buffer/Makefile > > @@ -0,0 +1,8 @@ > > +# SPDX-License-Identifier: GPL-2.0 > > +CFLAGS += -Wl,-no-as-needed -Wall > > +CFLAGS += $(KHDR_INCLUDES) > > +CFLAGS += -D_GNU_SOURCE > > + > > +TEST_GEN_PROGS = map_test > > + > > +include ../lib.mk > > diff --git a/tools/testing/selftests/ring-buffer/config b/tools/testing/selftests/ring-buffer/config > > new file mode 100644 > > index 000000000000..ef8214661612 > > --- /dev/null > > +++ b/tools/testing/selftests/ring-buffer/config > > @@ -0,0 +1 @@ > > +CONFIG_FTRACE=y > > diff --git a/tools/testing/selftests/ring-buffer/map_test.c b/tools/testing/selftests/ring-buffer/map_test.c > > new file mode 100644 > > index 000000000000..49107e8da5e9 > > --- /dev/null > > +++ b/tools/testing/selftests/ring-buffer/map_test.c > > @@ -0,0 +1,188 @@ > > +// SPDX-License-Identifier: GPL-2.0 > > +/* > > + * Ring-buffer memory mapping tests > > + * > > + * Copyright (c) 2024 Vincent Donnefort <vdonnefort@google.com> > > + */ > > +#include <fcntl.h> > > +#include <sched.h> > > +#include <stdbool.h> > > +#include <stdio.h> > > +#include <stdlib.h> > > +#include <unistd.h> > > + > > +#include <linux/trace_mmap.h> > > + > > +#include <sys/mman.h> > > +#include <sys/ioctl.h> > > + > > +#include "../user_events/user_events_selftests.h" /* share tracefs setup */ > > +#include "../kselftest_harness.h" > > + > > +#define TRACEFS_ROOT "/sys/kernel/tracing" > > + > > +static int __tracefs_write(const char *path, const char *value) > > +{ > > + FILE *file; > > + > > + file = fopen(path, "w"); > > + if (!file) > > + return -1; > > + > > + fputs(value, file); > > + fclose(file); > > + > > + return 0; > > +} > > + > > +static int __tracefs_write_int(const char *path, int value) > > +{ > > + char *str; > > + int ret; > > + > > + if (asprintf(&str, "%d", value) < 0) > > + return -1; > > + > > + ret = __tracefs_write(path, str); > > + > > + free(str); > > + > > + return ret; > > +} > > + > > +#define tracefs_write_int(path, value) \ > > + ASSERT_EQ(__tracefs_write_int((path), (value)), 0) > > + > > +static int tracefs_reset(void) > > +{ > > + if (__tracefs_write_int(TRACEFS_ROOT"/tracing_on", 0)) > > + return -1; > > + if (__tracefs_write_int(TRACEFS_ROOT"/trace", 0)) > > + return -1; > > + if (__tracefs_write(TRACEFS_ROOT"/set_event", "")) > > + return -1; > > + > > + return 0; > > +} > > + > > +FIXTURE(map) { > > + struct trace_buffer_meta *meta; > > + void *data; > > + int cpu_fd; > > + bool umount; > > +}; > > + > > +FIXTURE_VARIANT(map) { > > + int subbuf_size; > > +}; > > + > > +FIXTURE_VARIANT_ADD(map, subbuf_size_4k) { > > + .subbuf_size = 4, > > +}; > > + > > +FIXTURE_VARIANT_ADD(map, subbuf_size_8k) { > > + .subbuf_size = 8, > > +}; > > + > > +FIXTURE_SETUP(map) > > +{ > > + int cpu = sched_getcpu(), page_size = getpagesize(); > > + unsigned long meta_len, data_len; > > + char *cpu_path, *message; > > + bool fail, umount; > > + cpu_set_t cpu_mask; > > + void *map; > > + > > + if (!tracefs_enabled(&message, &fail, &umount)) { > > + if (fail) { > > + TH_LOG("Tracefs setup failed: %s", message); > > + ASSERT_FALSE(fail); > > + } > > + SKIP(return, "Skipping: %s", message); > > + } > > + > > + self->umount = umount; > > + > > + ASSERT_GE(cpu, 0); > > + > > + ASSERT_EQ(tracefs_reset(), 0); > > + > > + tracefs_write_int(TRACEFS_ROOT"/buffer_subbuf_size_kb", variant->subbuf_size); > > + > > + ASSERT_GE(asprintf(&cpu_path, > > + TRACEFS_ROOT"/per_cpu/cpu%d/trace_pipe_raw", > > + cpu), 0); > > + > > + self->cpu_fd = open(cpu_path, O_RDONLY | O_NONBLOCK); > > + ASSERT_GE(self->cpu_fd, 0); > > + free(cpu_path); > > + > > + map = mmap(NULL, page_size, PROT_READ, MAP_SHARED, self->cpu_fd, 0); > > + ASSERT_NE(map, MAP_FAILED); > > + self->meta = (struct trace_buffer_meta *)map; > > + > > + meta_len = self->meta->meta_page_size; > > + data_len = self->meta->subbuf_size * self->meta->nr_subbufs; > > + > > + map = mmap(NULL, data_len, PROT_READ, MAP_SHARED, self->cpu_fd, meta_len); > > + ASSERT_NE(map, MAP_FAILED); > > + self->data = map; > > + > > + /* > > + * Ensure generated events will be found on this very same ring-buffer. > > + */ > > + CPU_ZERO(&cpu_mask); > > + CPU_SET(cpu, &cpu_mask); > > + ASSERT_EQ(sched_setaffinity(0, sizeof(cpu_mask), &cpu_mask), 0); > > +} > > + > > +FIXTURE_TEARDOWN(map) > > +{ > > + tracefs_reset(); > > + > > + if (self->umount) > > + tracefs_unmount(); > > + > > + munmap(self->data, self->meta->subbuf_size * self->meta->nr_subbufs); > > + munmap(self->meta, self->meta->meta_page_size); > > + close(self->cpu_fd); > > +} > > + > > +TEST_F(map, meta_page_check) > > +{ > > + int cnt = 0; > > + > > + ASSERT_EQ(self->meta->entries, 0); > > + ASSERT_EQ(self->meta->overrun, 0); > > + ASSERT_EQ(self->meta->read, 0); > > + ASSERT_EQ(self->meta->subbufs_touched, 0); > > + ASSERT_EQ(self->meta->subbufs_lost, 0); > > + ASSERT_EQ(self->meta->subbufs_read, 0); > > + > > + ASSERT_EQ(self->meta->reader.id, 0); > > + ASSERT_EQ(self->meta->reader.read, 0); > > + > > + ASSERT_EQ(ioctl(self->cpu_fd, TRACE_MMAP_IOCTL_GET_READER), 0); > > + ASSERT_EQ(self->meta->reader.id, 0); > > + > > + tracefs_write_int(TRACEFS_ROOT"/tracing_on", 1); > > + for (int i = 0; i < 16; i++) > > + tracefs_write_int(TRACEFS_ROOT"/trace_marker", i); > > +again: > > + ASSERT_EQ(ioctl(self->cpu_fd, TRACE_MMAP_IOCTL_GET_READER), 0); > > + > > + ASSERT_EQ(self->meta->entries, 16); > > + ASSERT_EQ(self->meta->overrun, 0); > > + ASSERT_EQ(self->meta->read, 16); > > + /* subbufs_touched doesn't take into account the commit page */ > > + ASSERT_EQ(self->meta->subbufs_touched, 0); > > + ASSERT_EQ(self->meta->subbufs_lost, 0); > > + ASSERT_EQ(self->meta->subbufs_read, 1); > > + > > + ASSERT_EQ(self->meta->reader.id, 1); > > + > > + if (!(cnt++)) > > + goto again; > > +} > > + > > +TEST_HARNESS_MAIN > > -- > > 2.43.0.275.g3460e3d667-goog > > > > > -- > Masami Hiramatsu (Google) <mhiramat@kernel.org>
On Sun, 14 Jan 2024 23:17:11 +0900 Masami Hiramatsu (Google) <mhiramat@kernel.org> wrote: > > > > Looks good to me and tested. > > > > Reviewed-by: Masami Hiramatsu (Google) <mhiramat@kernel.org> > > Tested-by: Masami Hiramatsu (Google) <mhiramat@kernel.org> > > Sorry, I should cancel these. I found this test did not pass if I set > the function tracer on. > > / # cd /sys/kernel/tracing/ > /sys/kernel/tracing # echo function > current_tracer > /sys/kernel/tracing # /mnt/map_test > TAP version 13 > 1..2 > # Starting 2 tests from 2 test cases. > # RUN map.subbuf_size_4k.meta_page_check ... > # map_test.c:174:meta_page_check:Expected self->meta->entries (15293) == 16 (16) > # meta_page_check: Test terminated by assertion > # FAIL map.subbuf_size_4k.meta_page_check > not ok 1 map.subbuf_size_4k.meta_page_check > # RUN map.subbuf_size_8k.meta_page_check ... > # map_test.c:174:meta_page_check:Expected self->meta->entries (15270) == 16 (16) > # meta_page_check: Test terminated by assertion > # FAIL map.subbuf_size_8k.meta_page_check > not ok 2 map.subbuf_size_8k.meta_page_check > # FAILED: 0 / 2 tests passed. > # Totals: pass:0 fail:2 xfail:0 xpass:0 skip:0 error:0 > > Does this depend on "nop" tracer? Yes. > > > + > > > +static int tracefs_reset(void) > > > +{ > > > + if (__tracefs_write_int(TRACEFS_ROOT"/tracing_on", 0)) > > > + return -1; > > > + if (__tracefs_write_int(TRACEFS_ROOT"/trace", 0)) > > > + return -1; > > > + if (__tracefs_write(TRACEFS_ROOT"/set_event", "")) > > > + return -1; Looks like the below is needed: if (__traces_write(TRACEFS_ROOT"/current_tracer", "nop")) return -1; > > > + > > > + return 0; > > > +} > > > + -- Steve
diff --git a/tools/testing/selftests/ring-buffer/Makefile b/tools/testing/selftests/ring-buffer/Makefile new file mode 100644 index 000000000000..627c5fa6d1ab --- /dev/null +++ b/tools/testing/selftests/ring-buffer/Makefile @@ -0,0 +1,8 @@ +# SPDX-License-Identifier: GPL-2.0 +CFLAGS += -Wl,-no-as-needed -Wall +CFLAGS += $(KHDR_INCLUDES) +CFLAGS += -D_GNU_SOURCE + +TEST_GEN_PROGS = map_test + +include ../lib.mk diff --git a/tools/testing/selftests/ring-buffer/config b/tools/testing/selftests/ring-buffer/config new file mode 100644 index 000000000000..ef8214661612 --- /dev/null +++ b/tools/testing/selftests/ring-buffer/config @@ -0,0 +1 @@ +CONFIG_FTRACE=y diff --git a/tools/testing/selftests/ring-buffer/map_test.c b/tools/testing/selftests/ring-buffer/map_test.c new file mode 100644 index 000000000000..49107e8da5e9 --- /dev/null +++ b/tools/testing/selftests/ring-buffer/map_test.c @@ -0,0 +1,188 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Ring-buffer memory mapping tests + * + * Copyright (c) 2024 Vincent Donnefort <vdonnefort@google.com> + */ +#include <fcntl.h> +#include <sched.h> +#include <stdbool.h> +#include <stdio.h> +#include <stdlib.h> +#include <unistd.h> + +#include <linux/trace_mmap.h> + +#include <sys/mman.h> +#include <sys/ioctl.h> + +#include "../user_events/user_events_selftests.h" /* share tracefs setup */ +#include "../kselftest_harness.h" + +#define TRACEFS_ROOT "/sys/kernel/tracing" + +static int __tracefs_write(const char *path, const char *value) +{ + FILE *file; + + file = fopen(path, "w"); + if (!file) + return -1; + + fputs(value, file); + fclose(file); + + return 0; +} + +static int __tracefs_write_int(const char *path, int value) +{ + char *str; + int ret; + + if (asprintf(&str, "%d", value) < 0) + return -1; + + ret = __tracefs_write(path, str); + + free(str); + + return ret; +} + +#define tracefs_write_int(path, value) \ + ASSERT_EQ(__tracefs_write_int((path), (value)), 0) + +static int tracefs_reset(void) +{ + if (__tracefs_write_int(TRACEFS_ROOT"/tracing_on", 0)) + return -1; + if (__tracefs_write_int(TRACEFS_ROOT"/trace", 0)) + return -1; + if (__tracefs_write(TRACEFS_ROOT"/set_event", "")) + return -1; + + return 0; +} + +FIXTURE(map) { + struct trace_buffer_meta *meta; + void *data; + int cpu_fd; + bool umount; +}; + +FIXTURE_VARIANT(map) { + int subbuf_size; +}; + +FIXTURE_VARIANT_ADD(map, subbuf_size_4k) { + .subbuf_size = 4, +}; + +FIXTURE_VARIANT_ADD(map, subbuf_size_8k) { + .subbuf_size = 8, +}; + +FIXTURE_SETUP(map) +{ + int cpu = sched_getcpu(), page_size = getpagesize(); + unsigned long meta_len, data_len; + char *cpu_path, *message; + bool fail, umount; + cpu_set_t cpu_mask; + void *map; + + if (!tracefs_enabled(&message, &fail, &umount)) { + if (fail) { + TH_LOG("Tracefs setup failed: %s", message); + ASSERT_FALSE(fail); + } + SKIP(return, "Skipping: %s", message); + } + + self->umount = umount; + + ASSERT_GE(cpu, 0); + + ASSERT_EQ(tracefs_reset(), 0); + + tracefs_write_int(TRACEFS_ROOT"/buffer_subbuf_size_kb", variant->subbuf_size); + + ASSERT_GE(asprintf(&cpu_path, + TRACEFS_ROOT"/per_cpu/cpu%d/trace_pipe_raw", + cpu), 0); + + self->cpu_fd = open(cpu_path, O_RDONLY | O_NONBLOCK); + ASSERT_GE(self->cpu_fd, 0); + free(cpu_path); + + map = mmap(NULL, page_size, PROT_READ, MAP_SHARED, self->cpu_fd, 0); + ASSERT_NE(map, MAP_FAILED); + self->meta = (struct trace_buffer_meta *)map; + + meta_len = self->meta->meta_page_size; + data_len = self->meta->subbuf_size * self->meta->nr_subbufs; + + map = mmap(NULL, data_len, PROT_READ, MAP_SHARED, self->cpu_fd, meta_len); + ASSERT_NE(map, MAP_FAILED); + self->data = map; + + /* + * Ensure generated events will be found on this very same ring-buffer. + */ + CPU_ZERO(&cpu_mask); + CPU_SET(cpu, &cpu_mask); + ASSERT_EQ(sched_setaffinity(0, sizeof(cpu_mask), &cpu_mask), 0); +} + +FIXTURE_TEARDOWN(map) +{ + tracefs_reset(); + + if (self->umount) + tracefs_unmount(); + + munmap(self->data, self->meta->subbuf_size * self->meta->nr_subbufs); + munmap(self->meta, self->meta->meta_page_size); + close(self->cpu_fd); +} + +TEST_F(map, meta_page_check) +{ + int cnt = 0; + + ASSERT_EQ(self->meta->entries, 0); + ASSERT_EQ(self->meta->overrun, 0); + ASSERT_EQ(self->meta->read, 0); + ASSERT_EQ(self->meta->subbufs_touched, 0); + ASSERT_EQ(self->meta->subbufs_lost, 0); + ASSERT_EQ(self->meta->subbufs_read, 0); + + ASSERT_EQ(self->meta->reader.id, 0); + ASSERT_EQ(self->meta->reader.read, 0); + + ASSERT_EQ(ioctl(self->cpu_fd, TRACE_MMAP_IOCTL_GET_READER), 0); + ASSERT_EQ(self->meta->reader.id, 0); + + tracefs_write_int(TRACEFS_ROOT"/tracing_on", 1); + for (int i = 0; i < 16; i++) + tracefs_write_int(TRACEFS_ROOT"/trace_marker", i); +again: + ASSERT_EQ(ioctl(self->cpu_fd, TRACE_MMAP_IOCTL_GET_READER), 0); + + ASSERT_EQ(self->meta->entries, 16); + ASSERT_EQ(self->meta->overrun, 0); + ASSERT_EQ(self->meta->read, 16); + /* subbufs_touched doesn't take into account the commit page */ + ASSERT_EQ(self->meta->subbufs_touched, 0); + ASSERT_EQ(self->meta->subbufs_lost, 0); + ASSERT_EQ(self->meta->subbufs_read, 1); + + ASSERT_EQ(self->meta->reader.id, 1); + + if (!(cnt++)) + goto again; +} + +TEST_HARNESS_MAIN
This test maps a ring-buffer and validate the meta-page after reset and after emitting few events. Cc: Shuah Khan <shuah@kernel.org> Cc: Shuah Khan <skhan@linuxfoundation.org> Cc: linux-kselftest@vger.kernel.org Signed-off-by: Vincent Donnefort <vdonnefort@google.com>