374 lines
9.3 KiB
C
374 lines
9.3 KiB
C
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// 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 <acme@redhat.com>
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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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struct evsel *evsel __maybe_unused,
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int idx __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, struct perf_cpu 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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struct perf_cpu 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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#ifndef PYTHON_PERF
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zstd_fini(&map->zstd_data);
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#endif
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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 idx, nr_cpus;
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struct perf_cpu cpu;
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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 (idx = 0; idx < nr_cpus; idx++) {
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cpu = perf_cpu_map__cpu(cpu_map, idx); /* map c index to online cpu index */
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if (cpu__get_node(cpu) == node)
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__set_bit(cpu.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().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.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, struct perf_cpu 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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#ifndef PYTHON_PERF
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if (zstd_init(&map->zstd_data, mp->comp_level)) {
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pr_debug2("failed to init mmap compressor, error %d\n", errno);
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return -1;
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}
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#endif
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if (mp->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);
|
||
|
|
out:
|
||
|
|
return rc;
|
||
|
|
}
|
||
|
|
|
||
|
|
int mmap_cpu_mask__duplicate(struct mmap_cpu_mask *original, struct mmap_cpu_mask *clone)
|
||
|
|
{
|
||
|
|
clone->nbits = original->nbits;
|
||
|
|
clone->bits = bitmap_zalloc(original->nbits);
|
||
|
|
if (!clone->bits)
|
||
|
|
return -ENOMEM;
|
||
|
|
|
||
|
|
memcpy(clone->bits, original->bits, MMAP_CPU_MASK_BYTES(original));
|
||
|
|
return 0;
|
||
|
|
}
|