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