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#ifndef _IPXE_PROFILE_H
#define _IPXE_PROFILE_H
/** @file
*
* Profiling
*
*/
FILE_LICENCE ( GPL2_OR_LATER );
#include <stdint.h>
#include <bits/profile.h>
#include <ipxe/tables.h>
#ifdef NDEBUG
#define PROFILING 0
#else
#define PROFILING 1
#endif
/**
* A data structure for storing profiling information
*/
struct profiler {
/** Name */
const char *name;
/** Start timestamp */
uint64_t started;
/** Number of samples */
unsigned int count;
/** Mean sample value (scaled) */
unsigned long mean;
/** Mean sample value MSB
*
* This is the highest bit set in the raw (unscaled) value
* (i.e. one less than would be returned by flsl(raw_mean)).
*/
unsigned int mean_msb;
/** Accumulated variance (scaled) */
unsigned long long accvar;
/** Accumulated variance MSB
*
* This is the highest bit set in the raw (unscaled) value
* (i.e. one less than would be returned by flsll(raw_accvar)).
*/
unsigned int accvar_msb;
};
/** Profiler table */
#define PROFILERS __table ( struct profiler, "profilers" )
/** Declare a profiler */
#if PROFILING
#define __profiler __table_entry ( PROFILERS, 01 )
#else
#define __profiler
#endif
extern void profile_update ( struct profiler *profiler, unsigned long sample );
extern unsigned long profile_mean ( struct profiler *profiler );
extern unsigned long profile_variance ( struct profiler *profiler );
extern unsigned long profile_stddev ( struct profiler *profiler );
/**
* Start profiling
*
* @v profiler Profiler
*/
static inline __attribute__ (( always_inline )) void
profile_start ( struct profiler *profiler ) {
/* If profiling is active then record start timestamp */
if ( PROFILING )
profiler->started = profile_timestamp();
}
/**
* Record profiling result
*
* @v profiler Profiler
*/
static inline __attribute__ (( always_inline )) void
profile_stop ( struct profiler *profiler ) {
uint64_t ended;
/* If profiling is active then record end timestamp and update stats */
if ( PROFILING ) {
ended = profile_timestamp();
profile_update ( profiler, ( ended - profiler->started ) );
}
}
#endif /* _IPXE_PROFILE_H */
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