static int __noinstrument ilatcurve_read_proc(
char *page_buffer,
char **my_first_byte,
off_t virtual_start,
int length,
int *eof,
void *data)
{
int my_buffer_offset = 0;
char * const my_base = page_buffer;
int i;
if (virtual_start == 0) {
/*
* Just been opened so display the header information
* also stop logging BUGBUG: stop logging while we are
* reading, initialize the index numbers in the log array
*/
unsigned int usecs;
g_read_completed = 0;
usecs = clock_to_usecs(clock_diff(ilatency_start, ilatency_stop));;
my_buffer_offset += sprintf(my_base+my_buffer_offset,
"#%lu samples logged\n#timer measured %u ticks per usec.\n"
"#interrupt overhead %u microseconds\n"
"#maximum interrupt off time %u microseconds\n"
"#usecs samples\n", total_ilat_samples,
(unsigned)ticks_per_usec, usecs, maximum_off);
} else if (g_read_completed == BUCKETS) {
*eof = 1;
/* BUGBUG: start logging again */
return 0;
}
/* dump the sample log on the screen */
for (i = 0; i < (BUCKETS-1); i++) {
my_buffer_offset += sprintf(my_base + my_buffer_offset,
"%5u\t%8lu\n", (i + 1) * BUCKET_SIZE, bucketlog[i]);
g_read_completed++;
}
my_buffer_offset += sprintf(my_base + my_buffer_offset,
"%5u\t%8lu(greater than this time)\n", i * BUCKET_SIZE,
bucketlog[LAST_BUCKET]);
g_read_completed++;
*my_first_byte = page_buffer;
return my_buffer_offset;
}
/*!
* This function is needed by KFI to convert machine cycles to microseconds
*
* @param mputicks number of machine cycles
*
* @return elapsed microseconds
*/
unsigned long __noinstrument machinecycles_to_usecs(unsigned long mputicks)
{
return clock_to_usecs(mputicks);
}
