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cdd6c482c9
Bye-bye Performance Counters, welcome Performance Events! In the past few months the perfcounters subsystem has grown out its initial role of counting hardware events, and has become (and is becoming) a much broader generic event enumeration, reporting, logging, monitoring, analysis facility. Naming its core object 'perf_counter' and naming the subsystem 'perfcounters' has become more and more of a misnomer. With pending code like hw-breakpoints support the 'counter' name is less and less appropriate. All in one, we've decided to rename the subsystem to 'performance events' and to propagate this rename through all fields, variables and API names. (in an ABI compatible fashion) The word 'event' is also a bit shorter than 'counter' - which makes it slightly more convenient to write/handle as well. Thanks goes to Stephane Eranian who first observed this misnomer and suggested a rename. User-space tooling and ABI compatibility is not affected - this patch should be function-invariant. (Also, defconfigs were not touched to keep the size down.) This patch has been generated via the following script: FILES=$(find * -type f | grep -vE 'oprofile|[^K]config') sed -i \ -e 's/PERF_EVENT_/PERF_RECORD_/g' \ -e 's/PERF_COUNTER/PERF_EVENT/g' \ -e 's/perf_counter/perf_event/g' \ -e 's/nb_counters/nb_events/g' \ -e 's/swcounter/swevent/g' \ -e 's/tpcounter_event/tp_event/g' \ $FILES for N in $(find . -name perf_counter.[ch]); do M=$(echo $N | sed 's/perf_counter/perf_event/g') mv $N $M done FILES=$(find . -name perf_event.*) sed -i \ -e 's/COUNTER_MASK/REG_MASK/g' \ -e 's/COUNTER/EVENT/g' \ -e 's/\<event\>/event_id/g' \ -e 's/counter/event/g' \ -e 's/Counter/Event/g' \ $FILES ... to keep it as correct as possible. This script can also be used by anyone who has pending perfcounters patches - it converts a Linux kernel tree over to the new naming. We tried to time this change to the point in time where the amount of pending patches is the smallest: the end of the merge window. Namespace clashes were fixed up in a preparatory patch - and some stylistic fallout will be fixed up in a subsequent patch. ( NOTE: 'counters' are still the proper terminology when we deal with hardware registers - and these sed scripts are a bit over-eager in renaming them. I've undone some of that, but in case there's something left where 'counter' would be better than 'event' we can undo that on an individual basis instead of touching an otherwise nicely automated patch. ) Suggested-by: Stephane Eranian <eranian@google.com> Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Acked-by: Paul Mackerras <paulus@samba.org> Reviewed-by: Arjan van de Ven <arjan@linux.intel.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: David Howells <dhowells@redhat.com> Cc: Kyle McMartin <kyle@mcmartin.ca> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: "David S. Miller" <davem@davemloft.net> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: <linux-arch@vger.kernel.org> LKML-Reference: <new-submission> Signed-off-by: Ingo Molnar <mingo@elte.hu>
298 lines
5.9 KiB
C
298 lines
5.9 KiB
C
#include "builtin.h"
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#include "util/util.h"
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#include "util/cache.h"
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#include "util/symbol.h"
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#include "util/thread.h"
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#include "util/header.h"
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#include "util/parse-options.h"
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#include "perf.h"
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#include "util/debug.h"
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#include "util/trace-event.h"
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static char const *input_name = "perf.data";
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static int input;
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static unsigned long page_size;
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static unsigned long mmap_window = 32;
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static unsigned long total = 0;
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static unsigned long total_comm = 0;
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static struct rb_root threads;
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static struct thread *last_match;
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static struct perf_header *header;
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static u64 sample_type;
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static int
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process_comm_event(event_t *event, unsigned long offset, unsigned long head)
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{
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struct thread *thread;
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thread = threads__findnew(event->comm.pid, &threads, &last_match);
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dump_printf("%p [%p]: PERF_RECORD_COMM: %s:%d\n",
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(void *)(offset + head),
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(void *)(long)(event->header.size),
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event->comm.comm, event->comm.pid);
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if (thread == NULL ||
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thread__set_comm(thread, event->comm.comm)) {
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dump_printf("problem processing PERF_RECORD_COMM, skipping event.\n");
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return -1;
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}
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total_comm++;
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return 0;
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}
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static int
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process_sample_event(event_t *event, unsigned long offset, unsigned long head)
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{
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char level;
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int show = 0;
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struct dso *dso = NULL;
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struct thread *thread;
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u64 ip = event->ip.ip;
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u64 timestamp = -1;
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u32 cpu = -1;
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u64 period = 1;
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void *more_data = event->ip.__more_data;
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int cpumode;
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thread = threads__findnew(event->ip.pid, &threads, &last_match);
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if (sample_type & PERF_SAMPLE_TIME) {
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timestamp = *(u64 *)more_data;
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more_data += sizeof(u64);
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}
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if (sample_type & PERF_SAMPLE_CPU) {
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cpu = *(u32 *)more_data;
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more_data += sizeof(u32);
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more_data += sizeof(u32); /* reserved */
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}
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if (sample_type & PERF_SAMPLE_PERIOD) {
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period = *(u64 *)more_data;
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more_data += sizeof(u64);
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}
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dump_printf("%p [%p]: PERF_RECORD_SAMPLE (IP, %d): %d/%d: %p period: %Ld\n",
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(void *)(offset + head),
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(void *)(long)(event->header.size),
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event->header.misc,
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event->ip.pid, event->ip.tid,
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(void *)(long)ip,
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(long long)period);
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dump_printf(" ... thread: %s:%d\n", thread->comm, thread->pid);
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if (thread == NULL) {
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eprintf("problem processing %d event, skipping it.\n",
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event->header.type);
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return -1;
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}
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cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
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if (cpumode == PERF_RECORD_MISC_KERNEL) {
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show = SHOW_KERNEL;
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level = 'k';
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dso = kernel_dso;
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dump_printf(" ...... dso: %s\n", dso->name);
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} else if (cpumode == PERF_RECORD_MISC_USER) {
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show = SHOW_USER;
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level = '.';
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} else {
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show = SHOW_HV;
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level = 'H';
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dso = hypervisor_dso;
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dump_printf(" ...... dso: [hypervisor]\n");
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}
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if (sample_type & PERF_SAMPLE_RAW) {
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struct {
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u32 size;
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char data[0];
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} *raw = more_data;
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/*
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* FIXME: better resolve from pid from the struct trace_entry
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* field, although it should be the same than this perf
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* event pid
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*/
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print_event(cpu, raw->data, raw->size, timestamp, thread->comm);
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}
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total += period;
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return 0;
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}
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static int
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process_event(event_t *event, unsigned long offset, unsigned long head)
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{
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trace_event(event);
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switch (event->header.type) {
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case PERF_RECORD_MMAP ... PERF_RECORD_LOST:
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return 0;
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case PERF_RECORD_COMM:
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return process_comm_event(event, offset, head);
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case PERF_RECORD_EXIT ... PERF_RECORD_READ:
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return 0;
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case PERF_RECORD_SAMPLE:
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return process_sample_event(event, offset, head);
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case PERF_RECORD_MAX:
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default:
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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 int __cmd_trace(void)
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{
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int ret, rc = EXIT_FAILURE;
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unsigned long offset = 0;
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unsigned long head = 0;
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struct stat perf_stat;
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event_t *event;
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uint32_t size;
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char *buf;
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trace_report();
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register_idle_thread(&threads, &last_match);
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input = open(input_name, O_RDONLY);
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if (input < 0) {
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perror("failed to open file");
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exit(-1);
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}
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ret = fstat(input, &perf_stat);
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if (ret < 0) {
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perror("failed to stat file");
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exit(-1);
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}
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if (!perf_stat.st_size) {
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fprintf(stderr, "zero-sized file, nothing to do!\n");
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exit(0);
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}
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header = perf_header__read(input);
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head = header->data_offset;
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sample_type = perf_header__sample_type(header);
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if (!(sample_type & PERF_SAMPLE_RAW))
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die("No trace sample to read. Did you call perf record "
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"without -R?");
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if (load_kernel() < 0) {
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perror("failed to load kernel symbols");
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return EXIT_FAILURE;
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}
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remap:
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buf = (char *)mmap(NULL, page_size * mmap_window, PROT_READ,
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MAP_SHARED, input, offset);
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if (buf == MAP_FAILED) {
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perror("failed to mmap file");
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exit(-1);
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}
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more:
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event = (event_t *)(buf + head);
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size = event->header.size;
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if (!size)
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size = 8;
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if (head + event->header.size >= page_size * mmap_window) {
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unsigned long shift = page_size * (head / page_size);
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int res;
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res = munmap(buf, page_size * mmap_window);
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assert(res == 0);
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offset += shift;
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head -= shift;
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goto remap;
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}
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size = event->header.size;
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if (!size || process_event(event, offset, head) < 0) {
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/*
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* assume we lost track of the stream, check alignment, and
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* increment a single u64 in the hope to catch on again 'soon'.
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*/
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if (unlikely(head & 7))
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head &= ~7ULL;
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size = 8;
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}
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head += size;
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if (offset + head < (unsigned long)perf_stat.st_size)
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goto more;
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rc = EXIT_SUCCESS;
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close(input);
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return rc;
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}
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static const char * const annotate_usage[] = {
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"perf trace [<options>] <command>",
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NULL
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};
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static const struct option options[] = {
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OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
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"dump raw trace in ASCII"),
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OPT_BOOLEAN('v', "verbose", &verbose,
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"be more verbose (show symbol address, etc)"),
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OPT_END()
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};
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int cmd_trace(int argc, const char **argv, const char *prefix __used)
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{
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symbol__init();
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page_size = getpagesize();
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argc = parse_options(argc, argv, options, annotate_usage, 0);
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if (argc) {
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/*
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* Special case: if there's an argument left then assume tha
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* it's a symbol filter:
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*/
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if (argc > 1)
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usage_with_options(annotate_usage, options);
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}
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setup_pager();
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return __cmd_trace();
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}
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