/**
* monitor_tbufs - monitor the contents of tbufs
*/
static int monitor_tbufs(void)
{
int i;
struct t_struct *tbufs; /* Pointer to hypervisor maps */
struct t_buf **meta; /* pointers to the trace buffer metadata */
unsigned char **data; /* pointers to the trace buffer data areas
* where they are mapped into user space. */
unsigned long tbufs_mfn; /* mfn of the tbufs */
unsigned int num; /* number of trace buffers / logical CPUS */
unsigned long tinfo_size; /* size of t_info metadata map */
unsigned long size; /* size of a single trace buffer */
unsigned long data_size, rec_size;
/* get number of logical CPUs (and therefore number of trace buffers) */
num = get_num_cpus();
init_current(num);
alloc_qos_data(num);
printf("CPU Frequency = %7.2f\n", opts.cpu_freq);
/* setup access to trace buffers */
get_tbufs(&tbufs_mfn, &tinfo_size);
tbufs = map_tbufs(tbufs_mfn, num, tinfo_size);
size = tbufs->t_info->tbuf_size * XC_PAGE_SIZE;
data_size = size - sizeof(struct t_buf);
meta = tbufs->meta;
data = tbufs->data;
if ( eventchn_init() < 0 )
fprintf(stderr, "Failed to initialize event channel; "
"Using POLL method\r\n");
/* now, scan buffers for events */
while ( !interrupted )
{
for ( i = 0; (i < num) && !interrupted; i++ )
{
unsigned long start_offset, end_offset, cons, prod;
cons = meta[i]->cons;
prod = meta[i]->prod;
xen_rmb(); /* read prod, then read item. */
if ( cons == prod )
continue;
start_offset = cons % data_size;
end_offset = prod % data_size;
if ( start_offset >= end_offset )
{
while ( start_offset != data_size )
{
rec_size = process_record(
i, (struct t_rec *)(data[i] + start_offset));
start_offset += rec_size;
}
start_offset = 0;
}
while ( start_offset != end_offset )
{
rec_size = process_record(
i, (struct t_rec *)(data[i] + start_offset));
start_offset += rec_size;
}
xen_mb(); /* read item, then update cons. */
meta[i]->cons = prod;
}
wait_for_event();
wakeups++;
}
/* cleanup */
free(meta);
free(data);
/* don't need to munmap - cleanup is automatic */
return 0;
}
/**
* monitor_tbufs - monitor the contents of tbufs
*/
int monitor_tbufs(void)
{
int i;
extern int process_record(int, struct t_rec *);
extern void alloc_qos_data(int ncpu);
void *tbufs_mapped; /* pointer to where the tbufs are mapped */
struct t_buf **meta; /* pointers to the trace buffer metadata */
char **data; /* pointers to the trace buffer data areas
* where they are mapped into user space. */
unsigned long tbufs_mfn; /* mfn of the tbufs */
unsigned int num; /* number of trace buffers / logical CPUS */
unsigned long size; /* size of a single trace buffer */
unsigned long data_size, rec_size;
/* get number of logical CPUs (and therefore number of trace buffers) */
num = get_num_cpus();
init_current(num);
alloc_qos_data(num);
printf("CPU Frequency = %7.2f\n", opts.cpu_freq);
/* setup access to trace buffers */
get_tbufs(&tbufs_mfn, &size);
tbufs_mapped = map_tbufs(tbufs_mfn, num, size);
data_size = size - sizeof(struct t_buf);
/* build arrays of convenience ptrs */
meta = init_bufs_ptrs (tbufs_mapped, num, size);
data = (char **)init_rec_ptrs(meta, num);
if ( eventchn_init() < 0 )
fprintf(stderr, "Failed to initialize event channel; "
"Using POLL method\r\n");
/* now, scan buffers for events */
while ( !interrupted )
{
for ( i = 0; (i < num) && !interrupted; i++ )
{
while ( meta[i]->cons != meta[i]->prod )
{
rmb(); /* read prod, then read item. */
rec_size = process_record(
i, (struct t_rec *)(data[i] + meta[i]->cons % data_size));
mb(); /* read item, then update cons. */
meta[i]->cons += rec_size;
}
}
wait_for_event();
wakeups++;
}
/* cleanup */
free(meta);
free(data);
/* don't need to munmap - cleanup is automatic */
return 0;
}
