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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
commit | 5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 (patch) | |
tree | a94efe259b9009378be6d90eb30d2b019d95c194 /tools/perf/util/mmap.c | |
parent | Initial commit. (diff) | |
download | linux-430c2fc249ea5c0536abd21c23382884005c9093.tar.xz linux-430c2fc249ea5c0536abd21c23382884005c9093.zip |
Adding upstream version 5.10.209.upstream/5.10.209upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'tools/perf/util/mmap.c')
-rw-r--r-- | tools/perf/util/mmap.c | 352 |
1 files changed, 352 insertions, 0 deletions
diff --git a/tools/perf/util/mmap.c b/tools/perf/util/mmap.c new file mode 100644 index 000000000..ab7108d22 --- /dev/null +++ b/tools/perf/util/mmap.c @@ -0,0 +1,352 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2011-2017, Red Hat Inc, Arnaldo Carvalho de Melo <acme@redhat.com> + * + * Parts came from evlist.c builtin-{top,stat,record}.c, see those files for further + * copyright notes. + */ + +#include <sys/mman.h> +#include <inttypes.h> +#include <asm/bug.h> +#include <linux/zalloc.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> // sysconf() +#include <perf/mmap.h> +#ifdef HAVE_LIBNUMA_SUPPORT +#include <numaif.h> +#endif +#include "cpumap.h" +#include "debug.h" +#include "event.h" +#include "mmap.h" +#include "../perf.h" +#include <internal/lib.h> /* page_size */ +#include <linux/bitmap.h> + +#define MASK_SIZE 1023 +void mmap_cpu_mask__scnprintf(struct mmap_cpu_mask *mask, const char *tag) +{ + char buf[MASK_SIZE + 1]; + size_t len; + + len = bitmap_scnprintf(mask->bits, mask->nbits, buf, MASK_SIZE); + buf[len] = '\0'; + pr_debug("%p: %s mask[%zd]: %s\n", mask, tag, mask->nbits, buf); +} + +size_t mmap__mmap_len(struct mmap *map) +{ + return perf_mmap__mmap_len(&map->core); +} + +int __weak auxtrace_mmap__mmap(struct auxtrace_mmap *mm __maybe_unused, + struct auxtrace_mmap_params *mp __maybe_unused, + void *userpg __maybe_unused, + int fd __maybe_unused) +{ + return 0; +} + +void __weak auxtrace_mmap__munmap(struct auxtrace_mmap *mm __maybe_unused) +{ +} + +void __weak auxtrace_mmap_params__init(struct auxtrace_mmap_params *mp __maybe_unused, + off_t auxtrace_offset __maybe_unused, + unsigned int auxtrace_pages __maybe_unused, + bool auxtrace_overwrite __maybe_unused) +{ +} + +void __weak auxtrace_mmap_params__set_idx(struct auxtrace_mmap_params *mp __maybe_unused, + struct evlist *evlist __maybe_unused, + int idx __maybe_unused, + bool per_cpu __maybe_unused) +{ +} + +#ifdef HAVE_AIO_SUPPORT +static int perf_mmap__aio_enabled(struct mmap *map) +{ + return map->aio.nr_cblocks > 0; +} + +#ifdef HAVE_LIBNUMA_SUPPORT +static int perf_mmap__aio_alloc(struct mmap *map, int idx) +{ + map->aio.data[idx] = mmap(NULL, mmap__mmap_len(map), PROT_READ|PROT_WRITE, + MAP_PRIVATE|MAP_ANONYMOUS, 0, 0); + if (map->aio.data[idx] == MAP_FAILED) { + map->aio.data[idx] = NULL; + return -1; + } + + return 0; +} + +static void perf_mmap__aio_free(struct mmap *map, int idx) +{ + if (map->aio.data[idx]) { + munmap(map->aio.data[idx], mmap__mmap_len(map)); + map->aio.data[idx] = NULL; + } +} + +static int perf_mmap__aio_bind(struct mmap *map, int idx, int cpu, int affinity) +{ + void *data; + size_t mmap_len; + unsigned long *node_mask; + unsigned long node_index; + int err = 0; + + if (affinity != PERF_AFFINITY_SYS && cpu__max_node() > 1) { + data = map->aio.data[idx]; + mmap_len = mmap__mmap_len(map); + node_index = cpu__get_node(cpu); + node_mask = bitmap_alloc(node_index + 1); + if (!node_mask) { + pr_err("Failed to allocate node mask for mbind: error %m\n"); + return -1; + } + set_bit(node_index, node_mask); + if (mbind(data, mmap_len, MPOL_BIND, node_mask, node_index + 1 + 1, 0)) { + pr_err("Failed to bind [%p-%p] AIO buffer to node %lu: error %m\n", + data, data + mmap_len, node_index); + err = -1; + } + bitmap_free(node_mask); + } + + return err; +} +#else /* !HAVE_LIBNUMA_SUPPORT */ +static int perf_mmap__aio_alloc(struct mmap *map, int idx) +{ + map->aio.data[idx] = malloc(mmap__mmap_len(map)); + if (map->aio.data[idx] == NULL) + return -1; + + return 0; +} + +static void perf_mmap__aio_free(struct mmap *map, int idx) +{ + zfree(&(map->aio.data[idx])); +} + +static int perf_mmap__aio_bind(struct mmap *map __maybe_unused, int idx __maybe_unused, + int cpu __maybe_unused, int affinity __maybe_unused) +{ + return 0; +} +#endif + +static int perf_mmap__aio_mmap(struct mmap *map, struct mmap_params *mp) +{ + int delta_max, i, prio, ret; + + map->aio.nr_cblocks = mp->nr_cblocks; + if (map->aio.nr_cblocks) { + map->aio.aiocb = calloc(map->aio.nr_cblocks, sizeof(struct aiocb *)); + if (!map->aio.aiocb) { + pr_debug2("failed to allocate aiocb for data buffer, error %m\n"); + return -1; + } + map->aio.cblocks = calloc(map->aio.nr_cblocks, sizeof(struct aiocb)); + if (!map->aio.cblocks) { + pr_debug2("failed to allocate cblocks for data buffer, error %m\n"); + return -1; + } + map->aio.data = calloc(map->aio.nr_cblocks, sizeof(void *)); + if (!map->aio.data) { + pr_debug2("failed to allocate data buffer, error %m\n"); + return -1; + } + delta_max = sysconf(_SC_AIO_PRIO_DELTA_MAX); + for (i = 0; i < map->aio.nr_cblocks; ++i) { + ret = perf_mmap__aio_alloc(map, i); + if (ret == -1) { + pr_debug2("failed to allocate data buffer area, error %m"); + return -1; + } + ret = perf_mmap__aio_bind(map, i, map->core.cpu, mp->affinity); + if (ret == -1) + return -1; + /* + * Use cblock.aio_fildes value different from -1 + * to denote started aio write operation on the + * cblock so it requires explicit record__aio_sync() + * call prior the cblock may be reused again. + */ + map->aio.cblocks[i].aio_fildes = -1; + /* + * Allocate cblocks with priority delta to have + * faster aio write system calls because queued requests + * are kept in separate per-prio queues and adding + * a new request will iterate thru shorter per-prio + * list. Blocks with numbers higher than + * _SC_AIO_PRIO_DELTA_MAX go with priority 0. + */ + prio = delta_max - i; + map->aio.cblocks[i].aio_reqprio = prio >= 0 ? prio : 0; + } + } + + return 0; +} + +static void perf_mmap__aio_munmap(struct mmap *map) +{ + int i; + + for (i = 0; i < map->aio.nr_cblocks; ++i) + perf_mmap__aio_free(map, i); + if (map->aio.data) + zfree(&map->aio.data); + zfree(&map->aio.cblocks); + zfree(&map->aio.aiocb); +} +#else /* !HAVE_AIO_SUPPORT */ +static int perf_mmap__aio_enabled(struct mmap *map __maybe_unused) +{ + return 0; +} + +static int perf_mmap__aio_mmap(struct mmap *map __maybe_unused, + struct mmap_params *mp __maybe_unused) +{ + return 0; +} + +static void perf_mmap__aio_munmap(struct mmap *map __maybe_unused) +{ +} +#endif + +void mmap__munmap(struct mmap *map) +{ + bitmap_free(map->affinity_mask.bits); + + perf_mmap__aio_munmap(map); + if (map->data != NULL) { + munmap(map->data, mmap__mmap_len(map)); + map->data = NULL; + } + auxtrace_mmap__munmap(&map->auxtrace_mmap); +} + +static void build_node_mask(int node, struct mmap_cpu_mask *mask) +{ + int c, cpu, nr_cpus; + const struct perf_cpu_map *cpu_map = NULL; + + cpu_map = cpu_map__online(); + if (!cpu_map) + return; + + nr_cpus = perf_cpu_map__nr(cpu_map); + for (c = 0; c < nr_cpus; c++) { + cpu = cpu_map->map[c]; /* map c index to online cpu index */ + if (cpu__get_node(cpu) == node) + set_bit(cpu, mask->bits); + } +} + +static int perf_mmap__setup_affinity_mask(struct mmap *map, struct mmap_params *mp) +{ + map->affinity_mask.nbits = cpu__max_cpu(); + map->affinity_mask.bits = bitmap_alloc(map->affinity_mask.nbits); + if (!map->affinity_mask.bits) + return -1; + + if (mp->affinity == PERF_AFFINITY_NODE && cpu__max_node() > 1) + build_node_mask(cpu__get_node(map->core.cpu), &map->affinity_mask); + else if (mp->affinity == PERF_AFFINITY_CPU) + set_bit(map->core.cpu, map->affinity_mask.bits); + + return 0; +} + +int mmap__mmap(struct mmap *map, struct mmap_params *mp, int fd, int cpu) +{ + if (perf_mmap__mmap(&map->core, &mp->core, fd, cpu)) { + pr_debug2("failed to mmap perf event ring buffer, error %d\n", + errno); + return -1; + } + + if (mp->affinity != PERF_AFFINITY_SYS && + perf_mmap__setup_affinity_mask(map, mp)) { + pr_debug2("failed to alloc mmap affinity mask, error %d\n", + errno); + return -1; + } + + if (verbose == 2) + mmap_cpu_mask__scnprintf(&map->affinity_mask, "mmap"); + + map->core.flush = mp->flush; + + map->comp_level = mp->comp_level; + + if (map->comp_level && !perf_mmap__aio_enabled(map)) { + map->data = mmap(NULL, mmap__mmap_len(map), PROT_READ|PROT_WRITE, + MAP_PRIVATE|MAP_ANONYMOUS, 0, 0); + if (map->data == MAP_FAILED) { + pr_debug2("failed to mmap data buffer, error %d\n", + errno); + map->data = NULL; + return -1; + } + } + + if (auxtrace_mmap__mmap(&map->auxtrace_mmap, + &mp->auxtrace_mp, map->core.base, fd)) + return -1; + + return perf_mmap__aio_mmap(map, mp); +} + +int perf_mmap__push(struct mmap *md, void *to, + int push(struct mmap *map, void *to, void *buf, size_t size)) +{ + u64 head = perf_mmap__read_head(&md->core); + unsigned char *data = md->core.base + page_size; + unsigned long size; + void *buf; + int rc = 0; + + rc = perf_mmap__read_init(&md->core); + if (rc < 0) + return (rc == -EAGAIN) ? 1 : -1; + + size = md->core.end - md->core.start; + + if ((md->core.start & md->core.mask) + size != (md->core.end & md->core.mask)) { + buf = &data[md->core.start & md->core.mask]; + size = md->core.mask + 1 - (md->core.start & md->core.mask); + md->core.start += size; + + if (push(md, to, buf, size) < 0) { + rc = -1; + goto out; + } + } + + buf = &data[md->core.start & md->core.mask]; + size = md->core.end - md->core.start; + md->core.start += size; + + if (push(md, to, buf, size) < 0) { + rc = -1; + goto out; + } + + md->core.prev = head; + perf_mmap__consume(&md->core); +out: + return rc; +} |