void perf_pretty_print_event(FILE *fff, int fd, int original_pid,
struct perf_event_attr *pe,
pid_t pid, int cpu,
int group_fd, unsigned long flags) {
fprintf(fff,"/* fd = %d */\n",fd);
perf_pretty_print_attr(fff,pe,fd);
fprintf(fff,"\tfd[%d]=perf_event_open(&pe[%d],\n",fd,fd);
if (pid==original_pid) fprintf(fff,"\t\t\t\tgetpid(), /* current thread */\n");
else {
fprintf(fff,"\t\t\t\t%d, ",pid);
if (pid==0) fprintf(fff,"/* current thread */\n");
else if (pid==-1) fprintf(fff,"/* all processes */\n");
else fprintf(fff,"/* Only pid %d */\n",pid);
}
fprintf(fff,"\t\t\t\t%d, ",cpu);
if (cpu>=0) fprintf(fff,"/* Only cpu %d */\n",cpu);
else if (cpu==-1) fprintf(fff,"/* all cpus */\n");
else fprintf(fff,"/* Unknown setting? */\n");
if (group_fd==-1) {
fprintf(fff,"\t\t\t\t-1, /* New Group Leader */\n");
}
else {
fprintf(fff,"\t\t\t\tfd[%d], /* %d is group leader */\n",
group_fd,group_fd);
}
fprintf(fff,"\t\t\t\t");
perf_pretty_print_flags(fff,flags);
fprintf(fff," /*%lx*/ ",flags);
fprintf(fff,");\n");
fprintf(fff,"\n");
}
void trash_random_mmap(void) {
int i,value;
stats.mmap_trash_attempts++;
i=find_random_active_mmap();
/* Exit if no events */
if (i<0) return;
// printf("Found %d %p\n",i,mmaps[i].addr);
value=rand();
if (ignore_but_dont_skip.trash_mmap) return;
/* can't write high pages? */
//event_data[i].mmap_size);
// *(event_data[i].mmap)=0xff;
// printf("Attempting to trash %p: ",mmaps[i].addr);
// mmap_print_prot(mmaps[i].prot);
// mmap_print_flags(mmaps[i].flags);
// printf("\n");
/* If not writable then we segfault */
if (!(mmaps[i].prot & PROT_WRITE)) {
// printf("trash: Not writable, skipping\n");
return;
}
if ( (mmaps[i].aux) && (mmaps[i].prot&PROT_WRITE)) {
// printf("trash: writable aux, skipping\n");
return;
}
/* Before we attempt to write the mmap, setup a signal handler */
signal(SIGSEGV, sigsegv_handler);
/* Save state before the memset */
/* If the memset segfaults then we will skip it */
if (!sigsetjmp(j_buf, 1)) {
memset(mmaps[i].addr,value, 1);//getpagesize());
}
else {
printf("Memset of mmap#%d at %p caused segfault!\n",i,mmaps[i].addr);
perf_pretty_print_mmap_flags(mmaps[i].flags);
perf_pretty_print_mmap_prot(mmaps[i].prot);
printf("size %d fd %d\n",mmaps[i].size,mmaps[i].fd);
printf("event: cpu=%d pid=%d group_fd=%d flags=%ld ",
event_data[mmaps[i].which_event].cpu,
event_data[mmaps[i].which_event].pid,
event_data[mmaps[i].which_event].group_fd,
event_data[mmaps[i].which_event].flags
);
perf_pretty_print_attr(stdout,
&event_data[mmaps[i].which_event].attr,
mmaps[i].fd);
}
/* Disable the seigsegv handler */
signal(SIGSEGV, SIG_DFL);
if (logging&TYPE_TRASH_MMAP) {
sprintf(log_buffer,"Q %d %d %d\n",
value,
getpagesize(),
mmaps[i].fd);
write(log_fd,log_buffer,strlen(log_buffer));
}
stats.mmap_trash_successful++;
// printf("Done trashing\n");
}