root/tools/perf/arch/x86/util/event.c

DEFINITIONS

1. perf_event__synthesize_extra_kmaps

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <linux/types.h>
   3 #include <linux/string.h>
   4 #include <linux/zalloc.h>
   5 
   6 #include "../../util/event.h"
   7 #include "../../util/synthetic-events.h"
   8 #include "../../util/machine.h"
   9 #include "../../util/tool.h"
  10 #include "../../util/map.h"
  11 #include "../../util/debug.h"
  12 
  13 #if defined(__x86_64__)
  14 
  15 int perf_event__synthesize_extra_kmaps(struct perf_tool *tool,
  16                                        perf_event__handler_t process,
  17                                        struct machine *machine)
  18 {
  19         int rc = 0;
  20         struct map *pos;
  21         struct map_groups *kmaps = &machine->kmaps;
  22         struct maps *maps = &kmaps->maps;
  23         union perf_event *event = zalloc(sizeof(event->mmap) +
  24                                          machine->id_hdr_size);
  25 
  26         if (!event) {
  27                 pr_debug("Not enough memory synthesizing mmap event "
  28                          "for extra kernel maps\n");
  29                 return -1;
  30         }
  31 
  32         for (pos = maps__first(maps); pos; pos = map__next(pos)) {
  33                 struct kmap *kmap;
  34                 size_t size;
  35 
  36                 if (!__map__is_extra_kernel_map(pos))
  37                         continue;
  38 
  39                 kmap = map__kmap(pos);
  40 
  41                 size = sizeof(event->mmap) - sizeof(event->mmap.filename) +
  42                        PERF_ALIGN(strlen(kmap->name) + 1, sizeof(u64)) +
  43                        machine->id_hdr_size;
  44 
  45                 memset(event, 0, size);
  46 
  47                 event->mmap.header.type = PERF_RECORD_MMAP;
  48 
  49                 /*
  50                  * kernel uses 0 for user space maps, see kernel/perf_event.c
  51                  * __perf_event_mmap
  52                  */
  53                 if (machine__is_host(machine))
  54                         event->header.misc = PERF_RECORD_MISC_KERNEL;
  55                 else
  56                         event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
  57 
  58                 event->mmap.header.size = size;
  59 
  60                 event->mmap.start = pos->start;
  61                 event->mmap.len   = pos->end - pos->start;
  62                 event->mmap.pgoff = pos->pgoff;
  63                 event->mmap.pid   = machine->pid;
  64 
  65                 strlcpy(event->mmap.filename, kmap->name, PATH_MAX);
  66 
  67                 if (perf_tool__process_synth_event(tool, event, machine,
  68                                                    process) != 0) {
  69                         rc = -1;
  70                         break;
  71                 }
  72         }
  73 
  74         free(event);
  75         return rc;
  76 }
  77 
  78 #endif