diff options
author | Ingo Molnar <mingo@kernel.org> | 2014-06-13 08:19:06 +0200 |
---|---|---|
committer | Ingo Molnar <mingo@kernel.org> | 2014-06-13 08:19:06 +0200 |
commit | 4ba96195051be30160af6d5f5f83f9a055ab1f23 (patch) | |
tree | 7af7f287ce8c723393fa014288da900eb03a3641 | |
parent | 7184062b94b4bfac08715fb786fd2df399c5d6ee (diff) | |
parent | 45dc1bb5c1d47f9519e2101f6b073bb4bb1d1f99 (diff) | |
download | blackbird-op-linux-4ba96195051be30160af6d5f5f83f9a055ab1f23.tar.gz blackbird-op-linux-4ba96195051be30160af6d5f5f83f9a055ab1f23.zip |
Merge tag 'perf-core-for-mingo' of git://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf into perf/core
Pull perf/core improvements and fixes from Jiri Olsa:
* Honor user freq/interval properly in record command (Namhyung Kim)
* Speedup DWARF unwind (Jiri Olsa)
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
-rw-r--r-- | tools/perf/tests/builtin-test.c | 42 | ||||
-rw-r--r-- | tools/perf/tests/dso-data.c | 214 | ||||
-rw-r--r-- | tools/perf/tests/tests.h | 2 | ||||
-rw-r--r-- | tools/perf/util/dso.c | 279 | ||||
-rw-r--r-- | tools/perf/util/dso.h | 50 | ||||
-rw-r--r-- | tools/perf/util/event.h | 5 | ||||
-rw-r--r-- | tools/perf/util/evsel.c | 4 | ||||
-rw-r--r-- | tools/perf/util/perf_regs.c | 10 | ||||
-rw-r--r-- | tools/perf/util/perf_regs.h | 4 | ||||
-rw-r--r-- | tools/perf/util/unwind-libunwind.c | 2 |
10 files changed, 574 insertions, 38 deletions
diff --git a/tools/perf/tests/builtin-test.c b/tools/perf/tests/builtin-test.c index 802e3cd50f6f..6f8b01bc6033 100644 --- a/tools/perf/tests/builtin-test.c +++ b/tools/perf/tests/builtin-test.c @@ -3,6 +3,8 @@ * * Builtin regression testing command: ever growing number of sanity tests */ +#include <unistd.h> +#include <string.h> #include "builtin.h" #include "intlist.h" #include "tests.h" @@ -50,10 +52,18 @@ static struct test { .func = test__pmu, }, { - .desc = "Test dso data interface", + .desc = "Test dso data read", .func = test__dso_data, }, { + .desc = "Test dso data cache", + .func = test__dso_data_cache, + }, + { + .desc = "Test dso data reopen", + .func = test__dso_data_reopen, + }, + { .desc = "roundtrip evsel->name check", .func = test__perf_evsel__roundtrip_name_test, }, @@ -172,6 +182,34 @@ static bool perf_test__matches(int curr, int argc, const char *argv[]) return false; } +static int run_test(struct test *test) +{ + int status, err = -1, child = fork(); + + if (child < 0) { + pr_err("failed to fork test: %s\n", strerror(errno)); + return -1; + } + + if (!child) { + pr_debug("test child forked, pid %d\n", getpid()); + err = test->func(); + exit(err); + } + + wait(&status); + + if (WIFEXITED(status)) { + err = WEXITSTATUS(status); + pr_debug("test child finished with %d\n", err); + } else if (WIFSIGNALED(status)) { + err = -1; + pr_debug("test child interrupted\n"); + } + + return err; +} + static int __cmd_test(int argc, const char *argv[], struct intlist *skiplist) { int i = 0; @@ -200,7 +238,7 @@ static int __cmd_test(int argc, const char *argv[], struct intlist *skiplist) } pr_debug("\n--- start ---\n"); - err = tests[curr].func(); + err = run_test(&tests[curr]); pr_debug("---- end ----\n%s:", tests[curr].desc); switch (err) { diff --git a/tools/perf/tests/dso-data.c b/tools/perf/tests/dso-data.c index 3e6cb171e3d3..630808cd7cc2 100644 --- a/tools/perf/tests/dso-data.c +++ b/tools/perf/tests/dso-data.c @@ -1,22 +1,27 @@ -#include "util.h" - #include <stdlib.h> #include <linux/types.h> #include <sys/stat.h> #include <fcntl.h> #include <string.h> - +#include <sys/time.h> +#include <sys/resource.h> +#include <api/fs/fs.h> +#include "util.h" #include "machine.h" #include "symbol.h" #include "tests.h" static char *test_file(int size) { - static char buf_templ[] = "/tmp/test-XXXXXX"; +#define TEMPL "/tmp/perf-test-XXXXXX" + static char buf_templ[sizeof(TEMPL)]; char *templ = buf_templ; int fd, i; unsigned char *buf; + strcpy(buf_templ, TEMPL); +#undef TEMPL + fd = mkstemp(templ); if (fd < 0) { perror("mkstemp failed"); @@ -150,3 +155,204 @@ int test__dso_data(void) unlink(file); return 0; } + +static long open_files_cnt(void) +{ + char path[PATH_MAX]; + struct dirent *dent; + DIR *dir; + long nr = 0; + + scnprintf(path, PATH_MAX, "%s/self/fd", procfs__mountpoint()); + pr_debug("fd path: %s\n", path); + + dir = opendir(path); + TEST_ASSERT_VAL("failed to open fd directory", dir); + + while ((dent = readdir(dir)) != NULL) { + if (!strcmp(dent->d_name, ".") || + !strcmp(dent->d_name, "..")) + continue; + + nr++; + } + + closedir(dir); + return nr - 1; +} + +static struct dso **dsos; + +static int dsos__create(int cnt, int size) +{ + int i; + + dsos = malloc(sizeof(dsos) * cnt); + TEST_ASSERT_VAL("failed to alloc dsos array", dsos); + + for (i = 0; i < cnt; i++) { + char *file; + + file = test_file(size); + TEST_ASSERT_VAL("failed to get dso file", file); + + dsos[i] = dso__new(file); + TEST_ASSERT_VAL("failed to get dso", dsos[i]); + } + + return 0; +} + +static void dsos__delete(int cnt) +{ + int i; + + for (i = 0; i < cnt; i++) { + struct dso *dso = dsos[i]; + + unlink(dso->name); + dso__delete(dso); + } + + free(dsos); +} + +static int set_fd_limit(int n) +{ + struct rlimit rlim; + + if (getrlimit(RLIMIT_NOFILE, &rlim)) + return -1; + + pr_debug("file limit %ld, new %d\n", (long) rlim.rlim_cur, n); + + rlim.rlim_cur = n; + return setrlimit(RLIMIT_NOFILE, &rlim); +} + +int test__dso_data_cache(void) +{ + struct machine machine; + long nr_end, nr = open_files_cnt(); + int dso_cnt, limit, i, fd; + + memset(&machine, 0, sizeof(machine)); + + /* set as system limit */ + limit = nr * 4; + TEST_ASSERT_VAL("failed to set file limit", !set_fd_limit(limit)); + + /* and this is now our dso open FDs limit + 1 extra */ + dso_cnt = limit / 2 + 1; + TEST_ASSERT_VAL("failed to create dsos\n", + !dsos__create(dso_cnt, TEST_FILE_SIZE)); + + for (i = 0; i < (dso_cnt - 1); i++) { + struct dso *dso = dsos[i]; + + /* + * Open dsos via dso__data_fd or dso__data_read_offset. + * Both opens the data file and keep it open. + */ + if (i % 2) { + fd = dso__data_fd(dso, &machine); + TEST_ASSERT_VAL("failed to get fd", fd > 0); + } else { + #define BUFSIZE 10 + u8 buf[BUFSIZE]; + ssize_t n; + + n = dso__data_read_offset(dso, &machine, 0, buf, BUFSIZE); + TEST_ASSERT_VAL("failed to read dso", n == BUFSIZE); + } + } + + /* open +1 dso over the allowed limit */ + fd = dso__data_fd(dsos[i], &machine); + TEST_ASSERT_VAL("failed to get fd", fd > 0); + + /* should force the first one to be closed */ + TEST_ASSERT_VAL("failed to close dsos[0]", dsos[0]->data.fd == -1); + + /* cleanup everything */ + dsos__delete(dso_cnt); + + /* Make sure we did not leak any file descriptor. */ + nr_end = open_files_cnt(); + pr_debug("nr start %ld, nr stop %ld\n", nr, nr_end); + TEST_ASSERT_VAL("failed leadking files", nr == nr_end); + return 0; +} + +int test__dso_data_reopen(void) +{ + struct machine machine; + long nr_end, nr = open_files_cnt(); + int fd, fd_extra; + +#define dso_0 (dsos[0]) +#define dso_1 (dsos[1]) +#define dso_2 (dsos[2]) + + memset(&machine, 0, sizeof(machine)); + + /* + * Test scenario: + * - create 3 dso objects + * - set process file descriptor limit to current + * files count + 3 + * - test that the first dso gets closed when we + * reach the files count limit + */ + + /* Make sure we are able to open 3 fds anyway */ + TEST_ASSERT_VAL("failed to set file limit", + !set_fd_limit((nr + 3))); + + TEST_ASSERT_VAL("failed to create dsos\n", !dsos__create(3, TEST_FILE_SIZE)); + + /* open dso_0 */ + fd = dso__data_fd(dso_0, &machine); + TEST_ASSERT_VAL("failed to get fd", fd > 0); + + /* open dso_1 */ + fd = dso__data_fd(dso_1, &machine); + TEST_ASSERT_VAL("failed to get fd", fd > 0); + + /* + * open extra file descriptor and we just + * reached the files count limit + */ + fd_extra = open("/dev/null", O_RDONLY); + TEST_ASSERT_VAL("failed to open extra fd", fd_extra > 0); + + /* open dso_2 */ + fd = dso__data_fd(dso_2, &machine); + TEST_ASSERT_VAL("failed to get fd", fd > 0); + + /* + * dso_0 should get closed, because we reached + * the file descriptor limit + */ + TEST_ASSERT_VAL("failed to close dso_0", dso_0->data.fd == -1); + + /* open dso_0 */ + fd = dso__data_fd(dso_0, &machine); + TEST_ASSERT_VAL("failed to get fd", fd > 0); + + /* + * dso_1 should get closed, because we reached + * the file descriptor limit + */ + TEST_ASSERT_VAL("failed to close dso_1", dso_1->data.fd == -1); + + /* cleanup everything */ + close(fd_extra); + dsos__delete(3); + + /* Make sure we did not leak any file descriptor. */ + nr_end = open_files_cnt(); + pr_debug("nr start %ld, nr stop %ld\n", nr, nr_end); + TEST_ASSERT_VAL("failed leadking files", nr == nr_end); + return 0; +} diff --git a/tools/perf/tests/tests.h b/tools/perf/tests/tests.h index 022bb68fd9c7..ed64790a395f 100644 --- a/tools/perf/tests/tests.h +++ b/tools/perf/tests/tests.h @@ -28,6 +28,8 @@ int test__syscall_open_tp_fields(void); int test__pmu(void); int test__attr(void); int test__dso_data(void); +int test__dso_data_cache(void); +int test__dso_data_reopen(void); int test__parse_events(void); int test__hists_link(void); int test__python_use(void); diff --git a/tools/perf/util/dso.c b/tools/perf/util/dso.c index 64453d63b971..819f10414f08 100644 --- a/tools/perf/util/dso.c +++ b/tools/perf/util/dso.c @@ -1,3 +1,6 @@ +#include <asm/bug.h> +#include <sys/time.h> +#include <sys/resource.h> #include "symbol.h" #include "dso.h" #include "machine.h" @@ -136,7 +139,48 @@ int dso__read_binary_type_filename(const struct dso *dso, return ret; } -static int open_dso(struct dso *dso, struct machine *machine) +/* + * Global list of open DSOs and the counter. + */ +static LIST_HEAD(dso__data_open); +static long dso__data_open_cnt; + +static void dso__list_add(struct dso *dso) +{ + list_add_tail(&dso->data.open_entry, &dso__data_open); + dso__data_open_cnt++; +} + +static void dso__list_del(struct dso *dso) +{ + list_del(&dso->data.open_entry); + WARN_ONCE(dso__data_open_cnt <= 0, + "DSO data fd counter out of bounds."); + dso__data_open_cnt--; +} + +static void close_first_dso(void); + +static int do_open(char *name) +{ + int fd; + + do { + fd = open(name, O_RDONLY); + if (fd >= 0) + return fd; + + pr_debug("dso open failed, mmap: %s\n", strerror(errno)); + if (!dso__data_open_cnt || errno != EMFILE) + break; + + close_first_dso(); + } while (1); + + return -1; +} + +static int __open_dso(struct dso *dso, struct machine *machine) { int fd; char *root_dir = (char *)""; @@ -154,11 +198,130 @@ static int open_dso(struct dso *dso, struct machine *machine) return -EINVAL; } - fd = open(name, O_RDONLY); + fd = do_open(name); free(name); return fd; } +static void check_data_close(void); + +/** + * dso_close - Open DSO data file + * @dso: dso object + * + * Open @dso's data file descriptor and updates + * list/count of open DSO objects. + */ +static int open_dso(struct dso *dso, struct machine *machine) +{ + int fd = __open_dso(dso, machine); + + if (fd > 0) { + dso__list_add(dso); + /* + * Check if we crossed the allowed number + * of opened DSOs and close one if needed. + */ + check_data_close(); + } + + return fd; +} + +static void close_data_fd(struct dso *dso) +{ + if (dso->data.fd >= 0) { + close(dso->data.fd); + dso->data.fd = -1; + dso->data.file_size = 0; + dso__list_del(dso); + } +} + +/** + * dso_close - Close DSO data file + * @dso: dso object + * + * Close @dso's data file descriptor and updates + * list/count of open DSO objects. + */ +static void close_dso(struct dso *dso) +{ + close_data_fd(dso); +} + +static void close_first_dso(void) +{ + struct dso *dso; + + dso = list_first_entry(&dso__data_open, struct dso, data.open_entry); + close_dso(dso); +} + +static rlim_t get_fd_limit(void) +{ + struct rlimit l; + rlim_t limit = 0; + + /* Allow half of the current open fd limit. */ + if (getrlimit(RLIMIT_NOFILE, &l) == 0) { + if (l.rlim_cur == RLIM_INFINITY) + limit = l.rlim_cur; + else + limit = l.rlim_cur / 2; + } else { + pr_err("failed to get fd limit\n"); + limit = 1; + } + + return limit; +} + +static bool may_cache_fd(void) +{ + static rlim_t limit; + + if (!limit) + limit = get_fd_limit(); + + if (limit == RLIM_INFINITY) + return true; + + return limit > (rlim_t) dso__data_open_cnt; +} + +/* + * Check and close LRU dso if we crossed allowed limit + * for opened dso file descriptors. The limit is half + * of the RLIMIT_NOFILE files opened. +*/ +static void check_data_close(void) +{ + bool cache_fd = may_cache_fd(); + + if (!cache_fd) + close_first_dso(); +} + +/** + * dso__data_close - Close DSO data file + * @dso: dso object + * + * External interface to close @dso's data file descriptor. + */ +void dso__data_close(struct dso *dso) +{ + close_dso(dso); +} + +/** + * dso__data_fd - Get dso's data file descriptor + * @dso: dso object + * @machine: machine object + * + * External interface to find dso's file, open it and + * returns file descriptor. + */ int dso__data_fd(struct dso *dso, struct machine *machine) { enum dso_binary_type binary_type_data[] = { @@ -168,8 +331,13 @@ int dso__data_fd(struct dso *dso, struct machine *machine) }; int i = 0; - if (dso->binary_type != DSO_BINARY_TYPE__NOT_FOUND) - return open_dso(dso, machine); + if (dso->data.fd >= 0) + return dso->data.fd; + + if (dso->binary_type != DSO_BINARY_TYPE__NOT_FOUND) { + dso->data.fd = open_dso(dso, machine); + return dso->data.fd; + } do { int fd; @@ -178,7 +346,7 @@ int dso__data_fd(struct dso *dso, struct machine *machine) fd = open_dso(dso, machine); if (fd >= 0) - return fd; + return dso->data.fd = fd; } while (dso->binary_type != DSO_BINARY_TYPE__NOT_FOUND); @@ -260,16 +428,10 @@ dso_cache__memcpy(struct dso_cache *cache, u64 offset, } static ssize_t -dso_cache__read(struct dso *dso, struct machine *machine, - u64 offset, u8 *data, ssize_t size) +dso_cache__read(struct dso *dso, u64 offset, u8 *data, ssize_t size) { struct dso_cache *cache; ssize_t ret; - int fd; - - fd = dso__data_fd(dso, machine); - if (fd < 0) - return -1; do { u64 cache_offset; @@ -283,16 +445,16 @@ dso_cache__read(struct dso *dso, struct machine *machine, cache_offset = offset & DSO__DATA_CACHE_MASK; ret = -EINVAL; - if (-1 == lseek(fd, cache_offset, SEEK_SET)) + if (-1 == lseek(dso->data.fd, cache_offset, SEEK_SET)) break; - ret = read(fd, cache->data, DSO__DATA_CACHE_SIZE); + ret = read(dso->data.fd, cache->data, DSO__DATA_CACHE_SIZE); if (ret <= 0) break; cache->offset = cache_offset; cache->size = ret; - dso_cache__insert(&dso->cache, cache); + dso_cache__insert(&dso->data.cache, cache); ret = dso_cache__memcpy(cache, offset, data, size); @@ -301,24 +463,27 @@ dso_cache__read(struct dso *dso, struct machine *machine, if (ret <= 0) free(cache); - close(fd); return ret; } -static ssize_t dso_cache_read(struct dso *dso, struct machine *machine, - u64 offset, u8 *data, ssize_t size) +static ssize_t dso_cache_read(struct dso *dso, u64 offset, + u8 *data, ssize_t size) { struct dso_cache *cache; - cache = dso_cache__find(&dso->cache, offset); + cache = dso_cache__find(&dso->data.cache, offset); if (cache) return dso_cache__memcpy(cache, offset, data, size); else - return dso_cache__read(dso, machine, offset, data, size); + return dso_cache__read(dso, offset, data, size); } -ssize_t dso__data_read_offset(struct dso *dso, struct machine *machine, - u64 offset, u8 *data, ssize_t size) +/* + * Reads and caches dso data DSO__DATA_CACHE_SIZE size chunks + * in the rb_tree. Any read to already cached data is served + * by cached data. + */ +static ssize_t cached_read(struct dso *dso, u64 offset, u8 *data, ssize_t size) { ssize_t r = 0; u8 *p = data; @@ -326,7 +491,7 @@ ssize_t dso__data_read_offset(struct dso *dso, struct machine *machine, do { ssize_t ret; - ret = dso_cache_read(dso, machine, offset, p, size); + ret = dso_cache_read(dso, offset, p, size); if (ret < 0) return ret; @@ -346,6 +511,67 @@ ssize_t dso__data_read_offset(struct dso *dso, struct machine *machine, return r; } +static int data_file_size(struct dso *dso) +{ + struct stat st; + + if (!dso->data.file_size) { + if (fstat(dso->data.fd, &st)) { + pr_err("dso mmap failed, fstat: %s\n", strerror(errno)); + return -1; + } + dso->data.file_size = st.st_size; + } + + return 0; +} + +static ssize_t data_read_offset(struct dso *dso, u64 offset, + u8 *data, ssize_t size) +{ + if (data_file_size(dso)) + return -1; + + /* Check the offset sanity. */ + if (offset > dso->data.file_size) + return -1; + + if (offset + size < offset) + return -1; + + return cached_read(dso, offset, data, size); +} + +/** + * dso__data_read_offset - Read data from dso file offset + * @dso: dso object + * @machine: machine object + * @offset: file offset + * @data: buffer to store data + * @size: size of the @data buffer + * + * External interface to read data from dso file offset. Open + * dso data file and use cached_read to get the data. + */ +ssize_t dso__data_read_offset(struct dso *dso, struct machine *machine, + u64 offset, u8 *data, ssize_t size) +{ + if (dso__data_fd(dso, machine) < 0) + return -1; + + return data_read_offset(dso, offset, data, size); +} + +/** + * dso__data_read_addr - Read data from dso address + * @dso: dso object + * @machine: machine object + * @add: virtual memory address + * @data: buffer to store data + * @size: size of the @data buffer + * + * External interface to read data from dso address. + */ ssize_t dso__data_read_addr(struct dso *dso, struct map *map, struct machine *machine, u64 addr, u8 *data, ssize_t size) @@ -473,7 +699,8 @@ struct dso *dso__new(const char *name) dso__set_short_name(dso, dso->name, false); for (i = 0; i < MAP__NR_TYPES; ++i) dso->symbols[i] = dso->symbol_names[i] = RB_ROOT; - dso->cache = RB_ROOT; + dso->data.cache = RB_ROOT; + dso->data.fd = -1; dso->symtab_type = DSO_BINARY_TYPE__NOT_FOUND; dso->binary_type = DSO_BINARY_TYPE__NOT_FOUND; dso->loaded = 0; @@ -485,6 +712,7 @@ struct dso *dso__new(const char *name) dso->kernel = DSO_TYPE_USER; dso->needs_swap = DSO_SWAP__UNSET; INIT_LIST_HEAD(&dso->node); + INIT_LIST_HEAD(&dso->data.open_entry); } return dso; @@ -506,7 +734,8 @@ void dso__delete(struct dso *dso) dso->long_name_allocated = false; } - dso_cache__free(&dso->cache); + dso__data_close(dso); + dso_cache__free(&dso->data.cache); dso__free_a2l(dso); zfree(&dso->symsrc_filename); free(dso); diff --git a/tools/perf/util/dso.h b/tools/perf/util/dso.h index 38efe95a7fdd..ad553ba257bf 100644 --- a/tools/perf/util/dso.h +++ b/tools/perf/util/dso.h @@ -76,7 +76,6 @@ struct dso { struct list_head node; struct rb_root symbols[MAP__NR_TYPES]; struct rb_root symbol_names[MAP__NR_TYPES]; - struct rb_root cache; void *a2l; char *symsrc_filename; unsigned int a2l_fails; @@ -99,6 +98,15 @@ struct dso { const char *long_name; u16 long_name_len; u16 short_name_len; + + /* dso data file */ + struct { + struct rb_root cache; + int fd; + size_t file_size; + struct list_head open_entry; + } data; + char name[0]; }; @@ -141,7 +149,47 @@ char dso__symtab_origin(const struct dso *dso); int dso__read_binary_type_filename(const struct dso *dso, enum dso_binary_type type, char *root_dir, char *filename, size_t size); +/* + * The dso__data_* external interface provides following functions: + * dso__data_fd + * dso__data_close + * dso__data_read_offset + * dso__data_read_addr + * + * Please refer to the dso.c object code for each function and + * arguments documentation. Following text tries to explain the + * dso file descriptor caching. + * + * The dso__data* interface allows caching of opened file descriptors + * to speed up the dso data accesses. The idea is to leave the file + * descriptor opened ideally for the whole life of the dso object. + * + * The current usage of the dso__data_* interface is as follows: + * + * Get DSO's fd: + * int fd = dso__data_fd(dso, machine); + * USE 'fd' SOMEHOW + * + * Read DSO's data: + * n = dso__data_read_offset(dso_0, &machine, 0, buf, BUFSIZE); + * n = dso__data_read_addr(dso_0, &machine, 0, buf, BUFSIZE); + * + * Eventually close DSO's fd: + * dso__data_close(dso); + * + * It is not necessary to close the DSO object data file. Each time new + * DSO data file is opened, the limit (RLIMIT_NOFILE/2) is checked. Once + * it is crossed, the oldest opened DSO object is closed. + * + * The dso__delete function calls close_dso function to ensure the + * data file descriptor gets closed/unmapped before the dso object + * is freed. + * + * TODO +*/ int dso__data_fd(struct dso *dso, struct machine *machine); +void dso__data_close(struct dso *dso); + ssize_t dso__data_read_offset(struct dso *dso, struct machine *machine, u64 offset, u8 *data, ssize_t size); ssize_t dso__data_read_addr(struct dso *dso, struct map *map, diff --git a/tools/perf/util/event.h b/tools/perf/util/event.h index 9ba2eb3bdcfd..e5dd40addb30 100644 --- a/tools/perf/util/event.h +++ b/tools/perf/util/event.h @@ -7,6 +7,7 @@ #include "../perf.h" #include "map.h" #include "build-id.h" +#include "perf_regs.h" struct mmap_event { struct perf_event_header header; @@ -89,6 +90,10 @@ struct regs_dump { u64 abi; u64 mask; u64 *regs; + + /* Cached values/mask filled by first register access. */ + u64 cache_regs[PERF_REGS_MAX]; + u64 cache_mask; }; struct stack_dump { diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c index 21154dabc5fa..8606175fe1e8 100644 --- a/tools/perf/util/evsel.c +++ b/tools/perf/util/evsel.c @@ -589,10 +589,10 @@ void perf_evsel__config(struct perf_evsel *evsel, struct record_opts *opts) } /* - * We default some events to a 1 default interval. But keep + * We default some events to have a default interval. But keep * it a weak assumption overridable by the user. */ - if (!attr->sample_period || (opts->user_freq != UINT_MAX && + if (!attr->sample_period || (opts->user_freq != UINT_MAX || opts->user_interval != ULLONG_MAX)) { if (opts->freq) { perf_evsel__set_sample_bit(evsel, PERIOD); diff --git a/tools/perf/util/perf_regs.c b/tools/perf/util/perf_regs.c index a3539ef30b15..43168fb0d9a2 100644 --- a/tools/perf/util/perf_regs.c +++ b/tools/perf/util/perf_regs.c @@ -1,11 +1,15 @@ #include <errno.h> #include "perf_regs.h" +#include "event.h" int perf_reg_value(u64 *valp, struct regs_dump *regs, int id) { int i, idx = 0; u64 mask = regs->mask; + if (regs->cache_mask & (1 << id)) + goto out; + if (!(mask & (1 << id))) return -EINVAL; @@ -14,6 +18,10 @@ int perf_reg_value(u64 *valp, struct regs_dump *regs, int id) idx++; } - *valp = regs->regs[idx]; + regs->cache_mask |= (1 << id); + regs->cache_regs[id] = regs->regs[idx]; + +out: + *valp = regs->cache_regs[id]; return 0; } diff --git a/tools/perf/util/perf_regs.h b/tools/perf/util/perf_regs.h index 79c78f74e0cf..980dbf76bc98 100644 --- a/tools/perf/util/perf_regs.h +++ b/tools/perf/util/perf_regs.h @@ -2,7 +2,8 @@ #define __PERF_REGS_H #include <linux/types.h> -#include "event.h" + +struct regs_dump; #ifdef HAVE_PERF_REGS_SUPPORT #include <perf_regs.h> @@ -11,6 +12,7 @@ int perf_reg_value(u64 *valp, struct regs_dump *regs, int id); #else #define PERF_REGS_MASK 0 +#define PERF_REGS_MAX 0 static inline const char *perf_reg_name(int id __maybe_unused) { diff --git a/tools/perf/util/unwind-libunwind.c b/tools/perf/util/unwind-libunwind.c index bd5768d74f01..25578b98f5c5 100644 --- a/tools/perf/util/unwind-libunwind.c +++ b/tools/perf/util/unwind-libunwind.c @@ -250,7 +250,6 @@ static int read_unwind_spec_eh_frame(struct dso *dso, struct machine *machine, /* Check the .eh_frame section for unwinding info */ offset = elf_section_offset(fd, ".eh_frame_hdr"); - close(fd); if (offset) ret = unwind_spec_ehframe(dso, machine, offset, @@ -271,7 +270,6 @@ static int read_unwind_spec_debug_frame(struct dso *dso, /* Check the .debug_frame section for unwinding info */ *offset = elf_section_offset(fd, ".debug_frame"); - close(fd); if (*offset) return 0; |