/* * builtin-list.c * * Builtin list command: list all event types * * Copyright (C) 2009, Thomas Gleixner * Copyright (C) 2008-2009, Red Hat Inc, Ingo Molnar * Copyright (C) 2011, Red Hat Inc, Arnaldo Carvalho de Melo */ #include "builtin.h" #include "perf.h" #include "util/parse-events.h" #include "util/cache.h" #include "util/pmu.h" #include static bool desc_flag = true; int cmd_list(int argc, const char **argv, const char *prefix __maybe_unused) { int i; bool raw_dump = false; bool long_desc_flag = false; struct option list_options[] = { OPT_BOOLEAN(0, "raw-dump", &raw_dump, "Dump raw events"), OPT_BOOLEAN('d', "desc", &desc_flag, "Print extra event descriptions. --no-desc to not print."), OPT_BOOLEAN('v', "long-desc", &long_desc_flag, "Print longer event descriptions."), OPT_END() }; const char * const list_usage[] = { "perf list [] [hw|sw|cache|tracepoint|pmu|sdt|event_glob]", NULL }; set_option_flag(list_options, 0, "raw-dump", PARSE_OPT_HIDDEN); argc = parse_options(argc, argv, list_options, list_usage, PARSE_OPT_STOP_AT_NON_OPTION); setup_pager(); if (!raw_dump && pager_in_use()) printf("\nList of pre-defined events (to be used in -e):\n\n"); if (argc == 0) { print_events(NULL, raw_dump, !desc_flag, long_desc_flag); return 0; } for (i = 0; i < argc; ++i) { char *sep, *s; if (strcmp(argv[i], "tracepoint") == 0) print_tracepoint_events(NULL, NULL, raw_dump); else if (strcmp(argv[i], "hw") == 0 || strcmp(argv[i], "hardware") == 0) print_symbol_events(NULL, PERF_TYPE_HARDWARE, event_symbols_hw, PERF_COUNT_HW_MAX, raw_dump); else if (strcmp(argv[i], "sw") == 0 || strcmp(argv[i], "software") == 0) print_symbol_events(NULL, PERF_TYPE_SOFTWARE, event_symbols_sw, PERF_COUNT_SW_MAX, raw_dump); else if (strcmp(argv[i], "cache") == 0 || strcmp(argv[i], "hwcache") == 0) print_hwcache_events(NULL, raw_dump); else if (strcmp(argv[i], "pmu") == 0) print_pmu_events(NULL, raw_dump, !desc_flag, long_desc_flag); else if (strcmp(argv[i], "sdt") == 0) print_sdt_events(NULL, NULL, raw_dump); else if ((sep = strchr(argv[i], ':')) != NULL) { int sep_idx; if (sep == NULL) { print_events(argv[i], raw_dump, !desc_flag, long_desc_flag); continue; } sep_idx = sep - argv[i]; s = strdup(argv[i]); if (s == NULL) return -1; s[sep_idx] = '\0'; print_tracepoint_events(s, s + sep_idx + 1, raw_dump); print_sdt_events(s, s + sep_idx + 1, raw_dump); free(s); } else { if (asprintf(&s, "*%s*", argv[i]) < 0) { printf("Critical: Not enough memory! Trying to continue...\n"); continue; } print_symbol_events(s, PERF_TYPE_HARDWARE, event_symbols_hw, PERF_COUNT_HW_MAX, raw_dump); print_symbol_events(s, PERF_TYPE_SOFTWARE, event_symbols_sw, PERF_COUNT_SW_MAX, raw_dump); print_hwcache_events(s, raw_dump); print_pmu_events(s, raw_dump, !desc_flag, long_desc_flag); print_tracepoint_events(NULL, s, raw_dump); print_sdt_events(NULL, s, raw_dump); free(s); } } return 0; } rda.h?id=966d2b04e070bc040319aaebfec09e0144dc3341'>irnet_irda.h
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authorDouglas Miller <dougmill@linux.vnet.ibm.com>2017-01-28 06:42:20 -0600
committerTejun Heo <tj@kernel.org>2017-01-28 07:49:42 -0500
commit966d2b04e070bc040319aaebfec09e0144dc3341 (patch)
tree4b96156e3d1dd4dfd6039b7c219c9dc4616da52d /net/irda/irnet/irnet_irda.h
parent1b1bc42c1692e9b62756323c675a44cb1a1f9dbd (diff)
percpu-refcount: fix reference leak during percpu-atomic transition
percpu_ref_tryget() and percpu_ref_tryget_live() should return "true" IFF they acquire a reference. But the return value from atomic_long_inc_not_zero() is a long and may have high bits set, e.g. PERCPU_COUNT_BIAS, and the return value of the tryget routines is bool so the reference may actually be acquired but the routines return "false" which results in a reference leak since the caller assumes it does not need to do a corresponding percpu_ref_put(). This was seen when performing CPU hotplug during I/O, as hangs in blk_mq_freeze_queue_wait where percpu_ref_kill (blk_mq_freeze_queue_start) raced with percpu_ref_tryget (blk_mq_timeout_work). Sample stack trace: __switch_to+0x2c0/0x450 __schedule+0x2f8/0x970 schedule+0x48/0xc0 blk_mq_freeze_queue_wait+0x94/0x120 blk_mq_queue_reinit_work+0xb8/0x180 blk_mq_queue_reinit_prepare+0x84/0xa0 cpuhp_invoke_callback+0x17c/0x600 cpuhp_up_callbacks+0x58/0x150 _cpu_up+0xf0/0x1c0 do_cpu_up+0x120/0x150 cpu_subsys_online+0x64/0xe0 device_online+0xb4/0x120 online_store+0xb4/0xc0 dev_attr_store+0x68/0xa0 sysfs_kf_write+0x80/0xb0 kernfs_fop_write+0x17c/0x250 __vfs_write+0x6c/0x1e0 vfs_write+0xd0/0x270 SyS_write+0x6c/0x110 system_call+0x38/0xe0 Examination of the queue showed a single reference (no PERCPU_COUNT_BIAS, and __PERCPU_REF_DEAD, __PERCPU_REF_ATOMIC set) and no requests. However, conditions at the time of the race are count of PERCPU_COUNT_BIAS + 0 and __PERCPU_REF_DEAD and __PERCPU_REF_ATOMIC set. The fix is to make the tryget routines use an actual boolean internally instead of the atomic long result truncated to a int. Fixes: e625305b3907 percpu-refcount: make percpu_ref based on longs instead of ints Link: https://bugzilla.kernel.org/show_bug.cgi?id=190751 Signed-off-by: Douglas Miller <dougmill@linux.vnet.ibm.com> Reviewed-by: Jens Axboe <axboe@fb.com> Signed-off-by: Tejun Heo <tj@kernel.org> Fixes: e625305b3907 ("percpu-refcount: make percpu_ref based on longs instead of ints") Cc: stable@vger.kernel.org # v3.18+
Diffstat (limited to 'net/irda/irnet/irnet_irda.h')