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AJvYcCWcHeJXqijdIels2+oSMlP9BbbsZdyGeXE4H/kyck1smdbzIdat2JHjlTxmeDVb26ICjUx7eOlcRTHO9c0nhZI+@vger.kernel.org X-Gm-Message-State: AOJu0YxrQpCptpgEQ6/yY6IJ79iRm2uANxO4FjlHrzR/zkR6VMuaoLY7 zd5pa5oqmtult3Y1+ftffQ0GJzZuZrXLsU6AhUc9pIlLChQRZrD2NAKi9MbDR+Wp0nCZQW6snfM Qxel0qWPQBg== X-Google-Smtp-Source: AGHT+IFiKkz/9OzVUG9X/jUDA0Ctos0V8/bNH6kNseIOK99SlYBiURzIzAp3RpTufC5uxH7Urtm1a+WEoomM X-Received: from plrs15.prod.google.com ([2002:a17:902:b18f:b0:290:28e2:ce44]) (user=irogers job=prod-delivery.src-stubby-dispatcher) by 2002:a17:902:d512:b0:262:9c4:5470 with SMTP id d9443c01a7336-294dee9966emr21879795ad.28.1761716074024; Tue, 28 Oct 2025 22:34:34 -0700 (PDT) Date: Tue, 28 Oct 2025 22:34:07 -0700 In-Reply-To: <20251029053413.355154-1-irogers@google.com> Precedence: bulk X-Mailing-List: linux-perf-users@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20251029053413.355154-1-irogers@google.com> X-Mailer: git-send-email 2.51.1.851.g4ebd6896fd-goog Message-ID: <20251029053413.355154-10-irogers@google.com> Subject: [RFC PATCH v1 09/15] perf data: Clean up use_stdio and structures From: Ian Rogers To: Suzuki K Poulose , Mike Leach , James Clark , John Garry , Will Deacon , Leo Yan , Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Namhyung Kim , Alexander Shishkin , Jiri Olsa , Ian Rogers , Adrian Hunter , Greg Kroah-Hartman , Charlie Jenkins , Thomas Falcon , Yicong Yang , Thomas Richter , Athira Rajeev , Howard Chu , Song Liu , Dapeng Mi , Levi Yun , Zhongqiu Han , Blake Jones , Anubhav Shelat , Chun-Tse Shao , Christophe Leroy , Jean-Philippe Romain , Gautam Menghani , Dmitry Vyukov , Yang Li , linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, Andi Kleen , Weilin Wang Content-Type: text/plain; charset="UTF-8" use_stdio was associated with struct perf_data and not perf_data_file meaning there was implicit use of fd rather than fptr that may not be safe. For example, in perf_data_file__write. Reorganize perf_data_file to better abstract use_stdio, add kernel-doc and more consistently use perf_data__ accessors so that use_stdio is better respected. Signed-off-by: Ian Rogers --- tools/perf/builtin-inject.c | 7 ++-- tools/perf/builtin-record.c | 10 +++-- tools/perf/tests/topology.c | 3 +- tools/perf/util/data.c | 81 ++++++++++++++++++++++++------------- tools/perf/util/data.h | 52 ++++++++++++++++++++---- tools/perf/util/session.c | 2 +- 6 files changed, 109 insertions(+), 46 deletions(-) diff --git a/tools/perf/builtin-inject.c b/tools/perf/builtin-inject.c index a114b3fa1bea..bc2725dcdc8c 100644 --- a/tools/perf/builtin-inject.c +++ b/tools/perf/builtin-inject.c @@ -269,9 +269,8 @@ static s64 perf_event__repipe_auxtrace(struct perf_session *session, inject->have_auxtrace = true; if (!inject->output.is_pipe) { - off_t offset; + off_t offset = perf_data__seek(&inject->output, 0, SEEK_CUR); - offset = lseek(inject->output.file.fd, 0, SEEK_CUR); if (offset == -1) return -errno; ret = auxtrace_index__auxtrace_event(&session->auxtrace_index, @@ -2364,12 +2363,12 @@ int cmd_inject(int argc, const char **argv) .output = { .path = "-", .mode = PERF_DATA_MODE_WRITE, - .use_stdio = true, + .file.use_stdio = true, }, }; struct perf_data data = { .mode = PERF_DATA_MODE_READ, - .use_stdio = true, + .file.use_stdio = true, }; int ret; const char *known_build_ids = NULL; diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c index cb52aea9607d..3d8cf4090a92 100644 --- a/tools/perf/builtin-record.c +++ b/tools/perf/builtin-record.c @@ -453,7 +453,7 @@ static int record__aio_pushfn(struct mmap *map, void *to, void *buf, size_t size static int record__aio_push(struct record *rec, struct mmap *map, off_t *off) { int ret, idx; - int trace_fd = rec->session->data->file.fd; + int trace_fd = perf_data__fd(rec->session->data); struct record_aio aio = { .rec = rec, .size = 0 }; /* @@ -1676,7 +1676,7 @@ static int record__mmap_read_evlist(struct record *rec, struct evlist *evlist, int rc = 0; int nr_mmaps; struct mmap **maps; - int trace_fd = rec->data.file.fd; + int trace_fd = perf_data__fd(&rec->data); off_t off = 0; if (!evlist) @@ -1885,8 +1885,10 @@ record__finish_output(struct record *rec) rec->session->header.data_size += rec->bytes_written; data->file.size = lseek(perf_data__fd(data), 0, SEEK_CUR); if (record__threads_enabled(rec)) { - for (i = 0; i < data->dir.nr; i++) - data->dir.files[i].size = lseek(data->dir.files[i].fd, 0, SEEK_CUR); + for (i = 0; i < data->dir.nr; i++) { + data->dir.files[i].size = + perf_data_file__seek(&data->dir.files[i], 0, SEEK_CUR); + } } /* Buildid scanning disabled or build ID in kernel and synthesized map events. */ diff --git a/tools/perf/tests/topology.c b/tools/perf/tests/topology.c index ec01150d208d..af4618c3124a 100644 --- a/tools/perf/tests/topology.c +++ b/tools/perf/tests/topology.c @@ -52,7 +52,8 @@ static int session_write_header(char *path) session->header.data_size += DATA_SIZE; TEST_ASSERT_VAL("failed to write header", - !perf_session__write_header(session, session->evlist, data.file.fd, true)); + !perf_session__write_header(session, session->evlist, + perf_data__fd(&data), true)); evlist__delete(session->evlist); perf_session__delete(session); diff --git a/tools/perf/util/data.c b/tools/perf/util/data.c index 164eb45a0b36..0dcd4b8c51ce 100644 --- a/tools/perf/util/data.c +++ b/tools/perf/util/data.c @@ -20,18 +20,30 @@ #include "rlimit.h" #include -static void close_dir(struct perf_data_file *files, int nr) +static void perf_data_file__close(struct perf_data_file *file) { - while (--nr >= 0) { - close(files[nr].fd); - zfree(&files[nr].path); + if (file->use_stdio) { + fclose(file->fptr); + file->fptr = NULL; + } else { + close(file->fd); + file->fd = -1; } + zfree(&file->path); +} + +static void close_dir(struct perf_data_file *files, int nr) +{ + while (--nr >= 0) + perf_data_file__close(&files[nr]); + free(files); } void perf_data__close_dir(struct perf_data *data) { close_dir(data->dir.files, data->dir.nr); + data->dir.files = NULL; } int perf_data__create_dir(struct perf_data *data, int nr) @@ -174,7 +186,7 @@ static bool check_pipe(struct perf_data *data) } if (is_pipe) { - if (data->use_stdio) { + if (data->file.use_stdio) { const char *mode; mode = perf_data__is_read(data) ? "r" : "w"; @@ -182,7 +194,7 @@ static bool check_pipe(struct perf_data *data) if (data->file.fptr == NULL) { data->file.fd = fd; - data->use_stdio = false; + data->file.use_stdio = false; } /* @@ -353,7 +365,7 @@ int perf_data__open(struct perf_data *data) return 0; /* currently it allows stdio for pipe only */ - data->use_stdio = false; + data->file.use_stdio = false; if (!data->path) data->path = "perf.data"; @@ -373,41 +385,55 @@ void perf_data__close(struct perf_data *data) if (perf_data__is_dir(data)) perf_data__close_dir(data); - zfree(&data->file.path); - - if (data->use_stdio) - fclose(data->file.fptr); - else - close(data->file.fd); + perf_data_file__close(&data->file); } -ssize_t perf_data__read(struct perf_data *data, void *buf, size_t size) +static ssize_t perf_data_file__read(struct perf_data_file *file, void *buf, size_t size) { - if (data->use_stdio) { - if (fread(buf, size, 1, data->file.fptr) == 1) + if (file->use_stdio) { + if (fread(buf, size, 1, file->fptr) == 1) return size; - return feof(data->file.fptr) ? 0 : -1; + return feof(file->fptr) ? 0 : -1; } - return readn(data->file.fd, buf, size); + return readn(file->fd, buf, size); +} + +ssize_t perf_data__read(struct perf_data *data, void *buf, size_t size) +{ + return perf_data_file__read(&data->file, buf, size); } ssize_t perf_data_file__write(struct perf_data_file *file, void *buf, size_t size) { + if (file->use_stdio) { + if (fwrite(buf, size, /*nmemb=*/1, file->fptr) == 1) + return size; + return -1; + } return writen(file->fd, buf, size); } ssize_t perf_data__write(struct perf_data *data, void *buf, size_t size) { - if (data->use_stdio) { - if (fwrite(buf, size, 1, data->file.fptr) == 1) - return size; - return -1; - } return perf_data_file__write(&data->file, buf, size); } +off_t perf_data_file__seek(struct perf_data_file *file, off_t offset, int whence) +{ + if (file->use_stdio) + return fseek(file->fptr, offset, whence); + + return lseek(file->fd, offset, whence); +} + +off_t perf_data__seek(struct perf_data *data, off_t offset, int whence) +{ + assert(!data->is_pipe); + return perf_data_file__seek(&data->file, offset, whence); +} + int perf_data__switch(struct perf_data *data, const char *postfix, size_t pos, bool at_exit, @@ -429,19 +455,18 @@ int perf_data__switch(struct perf_data *data, pr_warning("Failed to rename %s to %s\n", data->path, *new_filepath); if (!at_exit) { - close(data->file.fd); + perf_data_file__close(&data->file); ret = perf_data__open(data); if (ret < 0) goto out; - if (lseek(data->file.fd, pos, SEEK_SET) == (off_t)-1) { + if (perf_data__seek(data, pos, SEEK_SET) == (off_t)-1) { ret = -errno; - pr_debug("Failed to lseek to %zu: %s", - pos, strerror(errno)); + pr_debug("Failed to seek to %zu: %s", pos, strerror(errno)); goto out; } } - ret = data->file.fd; + ret = perf_data__fd(data); out: return ret; } diff --git a/tools/perf/util/data.h b/tools/perf/util/data.h index 1438e32e0451..71f06df7abdb 100644 --- a/tools/perf/util/data.h +++ b/tools/perf/util/data.h @@ -17,32 +17,70 @@ enum perf_dir_version { PERF_DIR_VERSION = 1, }; +/** + * struct perf_data_file: A wrapper around a file used for perf.data reading or writing. Generally part + * of struct perf_data. + */ struct perf_data_file { + /** + * @path: Path of file. Generally a copy of perf_data.path but for a + * directory it is the file within the directory. + */ char *path; union { + /** @fd: File descriptor for read/writes. Valid if use_stdio is false. */ int fd; + /** + * @fptr: Stdio FILE. Valid if use_stdio is true, currently just + * pipes in perf inject. + */ FILE *fptr; }; + /** @size: Size of file when opened. */ unsigned long size; + /** @use_stdio: Use buffered stdio operations. */ + bool use_stdio; }; +/** + * struct perf_data: A wrapper around a file used for perf.data reading or writing. + */ struct perf_data { + /** @path: Path to open and of the file. NULL implies 'perf.data' will be used. */ const char *path; + /** @file: Underlying file to be used. */ struct perf_data_file file; + /** @is_pipe: Underlying file is a pipe. */ bool is_pipe; + /** @is_dir: Underlying file is a directory. */ bool is_dir; + /** @force: Ignore opening a file creating created by a different user. */ bool force; - bool use_stdio; + /** @in_place_update: A file opened for reading but will be written to. */ bool in_place_update; + /** @mode: Read or write mode. */ enum perf_data_mode mode; struct { + /** @version: perf_dir_version. */ u64 version; + /** @files: perf data files for the directory. */ struct perf_data_file *files; + /** @nr: Number of perf data files for the directory. */ int nr; } dir; }; +static inline int perf_data_file__fd(struct perf_data_file *file) +{ + return file->use_stdio ? fileno(file->fptr) : file->fd; +} + +ssize_t perf_data_file__write(struct perf_data_file *file, + void *buf, size_t size); +off_t perf_data_file__seek(struct perf_data_file *file, off_t offset, int whence); + + static inline bool perf_data__is_read(struct perf_data *data) { return data->mode == PERF_DATA_MODE_READ; @@ -70,10 +108,7 @@ static inline bool perf_data__is_single_file(struct perf_data *data) static inline int perf_data__fd(struct perf_data *data) { - if (data->use_stdio) - return fileno(data->file.fptr); - - return data->file.fd; + return perf_data_file__fd(&data->file); } int perf_data__open(struct perf_data *data); @@ -81,8 +116,7 @@ void perf_data__close(struct perf_data *data); ssize_t perf_data__read(struct perf_data *data, void *buf, size_t size); ssize_t perf_data__write(struct perf_data *data, void *buf, size_t size); -ssize_t perf_data_file__write(struct perf_data_file *file, - void *buf, size_t size); +off_t perf_data__seek(struct perf_data *data, off_t offset, int whence); /* * If at_exit is set, only rename current perf.data to * perf.data., continue write on original data. @@ -99,8 +133,10 @@ int perf_data__open_dir(struct perf_data *data); void perf_data__close_dir(struct perf_data *data); unsigned long perf_data__size(struct perf_data *data); int perf_data__make_kcore_dir(struct perf_data *data, char *buf, size_t buf_sz); -bool has_kcore_dir(const char *path); char *perf_data__kallsyms_name(struct perf_data *data); char *perf_data__guest_kallsyms_name(struct perf_data *data, pid_t machine_pid); + +bool has_kcore_dir(const char *path); bool is_perf_data(const char *path); + #endif /* __PERF_DATA_H */ diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c index 09af486c83e4..081e68c72c30 100644 --- a/tools/perf/util/session.c +++ b/tools/perf/util/session.c @@ -2358,7 +2358,7 @@ static int __perf_session__process_dir_events(struct perf_session *session) if (!data->dir.files[i].size) continue; rd[readers] = (struct reader) { - .fd = data->dir.files[i].fd, + .fd = perf_data_file__fd(&data->dir.files[i]), .path = data->dir.files[i].path, .data_size = data->dir.files[i].size, .data_offset = 0, -- 2.51.1.851.g4ebd6896fd-goog