Messages in this thread Patch in this message | | | From | Wang Nan <> | Subject | [RFC PATCH v3 36/37] perf tools: Add bpf_fd field to evsel and config it | Date | Sun, 17 May 2015 10:57:01 +0000 |
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This patch adds a bpf_fd field to 'struct evsel' then introduces method to config it. In bpf-loader, a bpf_for_each_program() function is added. Which calls the callback function for each found eBPF program with their names and file descriptors. In evlist.c, perf_evlist__add_bpf() is added to add all bpf events into evlist. 'perf record' calls perf_evlist__add_bpf() if it is wrapped by perf bpf.
Since bpf-loader.c will not built if libelf not found, an empty bpf_for_each_program() is defined in bpf-loader.h to avoid compiling error.
Signed-off-by: Wang Nan <wangnan0@huawei.com> --- tools/perf/builtin-record.c | 6 ++++++ tools/perf/util/bpf-loader.c | 30 ++++++++++++++++++++++++++++++ tools/perf/util/bpf-loader.h | 18 ++++++++++++++++++ tools/perf/util/evlist.c | 34 ++++++++++++++++++++++++++++++++++ tools/perf/util/evlist.h | 1 + tools/perf/util/evsel.c | 1 + tools/perf/util/evsel.h | 1 + 7 files changed, 91 insertions(+)
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c index c3efdfb..21f3dcb 100644 --- a/tools/perf/builtin-record.c +++ b/tools/perf/builtin-record.c @@ -978,6 +978,12 @@ int cmd_record(int argc, const char **argv, const char *prefix __maybe_unused) goto out_symbol_exit; } + if (bpf_wrapper && + perf_evlist__add_bpf(rec->evlist) < 0) { + pr_err("Failed to add events from bpf object\n"); + goto out_symbol_exit; + } + if (rec->opts.target.tid && !rec->opts.no_inherit_set) rec->opts.no_inherit = true; diff --git a/tools/perf/util/bpf-loader.c b/tools/perf/util/bpf-loader.c index 7295a3b..b793c69 100644 --- a/tools/perf/util/bpf-loader.c +++ b/tools/perf/util/bpf-loader.c @@ -230,3 +230,33 @@ int bpf_load(void) return 0; } + +int bpf_for_each_program(bpf_prog_iter_callback_t func, void *arg) +{ + int i; + + if (!func) + return -EINVAL; + + for (i = 0; i < (int)params.nr_progs; i++) { + int err, fd; + const char *group, *event; + struct bpf_prog_handler *prog = + params.progs[i].prog; + struct perf_probe_event *pevent = + params.progs[i].pevent; + + group = pevent->group; + event = pevent->event; + err = bpf_prog_get_fd(prog, &fd); + if (err) { + pr_err("Unable to get program fd\n"); + return -EINVAL; + } + + err = func(group, event, fd, arg); + if (err) + return err; + } + return 0; +} diff --git a/tools/perf/util/bpf-loader.h b/tools/perf/util/bpf-loader.h index 1ccebdf..ffdd535 100644 --- a/tools/perf/util/bpf-loader.h +++ b/tools/perf/util/bpf-loader.h @@ -7,10 +7,28 @@ #ifndef __BPF_LOADER_H #define __BPF_LOADER_H +#include <linux/compiler.h> // for __maybe_unused + int bpf_prepare_load(const char *filename); int bpf_probe(void); int bpf_load(void); int bpf_unprobe(void); void bpf_clear(void); + +typedef int (*bpf_prog_iter_callback_t)(const char *group, + const char *event, + int fd, void *arg); + +#ifdef HAVE_LIBELF_SUPPORT +int bpf_for_each_program(bpf_prog_iter_callback_t func, void *arg); +#else +static inline int +bpf_for_each_program(bpf_prog_iter_callback_t func __maybe_unused, + void *arg __maybe_unused) +{ + return 0; +} +#endif + #endif diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c index 080be93..cc26317 100644 --- a/tools/perf/util/evlist.c +++ b/tools/perf/util/evlist.c @@ -14,6 +14,7 @@ #include "target.h" #include "evlist.h" #include "evsel.h" +#include "bpf-loader.h" #include "debug.h" #include <unistd.h> @@ -194,6 +195,39 @@ error: return -ENOMEM; } +static int add_bpf_event(const char *group, const char *event, int fd, + void *arg) +{ + struct perf_evlist *evlist = arg; + struct perf_evsel *pos; + struct list_head list; + int err, idx, entries; + + pr_info("add bpf event %s:%s and attach bpf program %d\n", + group, event, fd); + + INIT_LIST_HEAD(&list); + idx = evlist->nr_entries; + err = parse_events_add_tracepoint(&list, &idx, (char *)group, + (char *)event); + if (err) { + pr_err("Failed to add BPF event %s:%s\n", + group, event); + return err; + } + list_for_each_entry(pos, &list, node) + pos->bpf_fd = fd; + + entries = idx - evlist->nr_entries; + perf_evlist__splice_list_tail(evlist, &list, entries); + return 0; +} + +int perf_evlist__add_bpf(struct perf_evlist *evlist) +{ + return bpf_for_each_program(add_bpf_event, evlist); +} + static int perf_evlist__add_attrs(struct perf_evlist *evlist, struct perf_event_attr *attrs, size_t nr_attrs) { diff --git a/tools/perf/util/evlist.h b/tools/perf/util/evlist.h index b5cce95..032f04d 100644 --- a/tools/perf/util/evlist.h +++ b/tools/perf/util/evlist.h @@ -68,6 +68,7 @@ void perf_evlist__delete(struct perf_evlist *evlist); void perf_evlist__add(struct perf_evlist *evlist, struct perf_evsel *entry); int perf_evlist__add_default(struct perf_evlist *evlist); +int perf_evlist__add_bpf(struct perf_evlist *evlist); int __perf_evlist__add_default_attrs(struct perf_evlist *evlist, struct perf_event_attr *attrs, size_t nr_attrs); diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c index 33e3fd8..04d60a7 100644 --- a/tools/perf/util/evsel.c +++ b/tools/perf/util/evsel.c @@ -205,6 +205,7 @@ void perf_evsel__init(struct perf_evsel *evsel, evsel->leader = evsel; evsel->unit = ""; evsel->scale = 1.0; + evsel->bpf_fd = -1; INIT_LIST_HEAD(&evsel->node); perf_evsel__object.init(evsel); evsel->sample_size = __perf_evsel__sample_size(attr->sample_type); diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h index e486151..ff1f634 100644 --- a/tools/perf/util/evsel.h +++ b/tools/perf/util/evsel.h @@ -100,6 +100,7 @@ struct perf_evsel { int sample_read; struct perf_evsel *leader; char *group_name; + int bpf_fd; }; union u64_swap { -- 1.8.3.4
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