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[profile] Provide methods for profiling individual stages of operations 

Signed-off-by: Michael Brown <mcb30@ipxe.org>
pull/19/head
Michael Brown 2014-05-03 18:25:19 +01:00
parent bcfaf119a7
commit a0da06c306
2 changed files with 42 additions and 12 deletions
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10
src/arch/i386/transitions/librm_test.c
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@ -51,7 +51,8 @@ static struct profiler r2p_profiler __profiler = { .name = "r2p" };
*/ */
static void librm_test_exec ( void ) { static void librm_test_exec ( void ) {
unsigned int i; unsigned int i;
unsigned long p2r_elapsed; unsigned long timestamp;
unsigned int discard_d;
/* Profile mode transitions. We want to profile each /* Profile mode transitions. We want to profile each
* direction of the transition separately, so perform an RDTSC * direction of the transition separately, so perform an RDTSC
@ -61,10 +62,11 @@ static void librm_test_exec ( void ) {
for ( i = 0 ; i < PROFILE_COUNT ; i++ ) { for ( i = 0 ; i < PROFILE_COUNT ; i++ ) {
profile_start ( &p2r_profiler ); profile_start ( &p2r_profiler );
__asm__ __volatile__ ( REAL_CODE ( "rdtsc\n\t" ) __asm__ __volatile__ ( REAL_CODE ( "rdtsc\n\t" )
: "=A" ( r2p_profiler.started ) : ); : "=a" ( timestamp ), "=d" ( discard_d )
: );
profile_start_at ( &r2p_profiler, timestamp );
profile_stop ( &r2p_profiler ); profile_stop ( &r2p_profiler );
p2r_elapsed = ( r2p_profiler.started - p2r_profiler.started ); profile_stop_at ( &p2r_profiler, timestamp );
profile_update ( &p2r_profiler, p2r_elapsed );
} }
} }

44
src/include/ipxe/profile.h
View File

@ -9,7 +9,6 @@
FILE_LICENCE ( GPL2_OR_LATER ); FILE_LICENCE ( GPL2_OR_LATER );
#include <stdint.h>
#include <bits/profile.h> #include <bits/profile.h>
#include <ipxe/tables.h> #include <ipxe/tables.h>
@ -26,7 +25,9 @@ struct profiler {
/** Name */ /** Name */
const char *name; const char *name;
/** Start timestamp */ /** Start timestamp */
uint64_t started; unsigned long started;
/** Stop timestamp */
unsigned long stopped;
/** Number of samples */ /** Number of samples */
unsigned int count; unsigned int count;
/** Mean sample value (scaled) */ /** Mean sample value (scaled) */
@ -62,6 +63,20 @@ extern unsigned long profile_mean ( struct profiler *profiler );
extern unsigned long profile_variance ( struct profiler *profiler ); extern unsigned long profile_variance ( struct profiler *profiler );
extern unsigned long profile_stddev ( struct profiler *profiler ); extern unsigned long profile_stddev ( struct profiler *profiler );
/**
* Start profiling
*
* @v profiler Profiler
* @v started Start timestamp
*/
static inline __attribute__ (( always_inline )) void
profile_start_at ( struct profiler *profiler, unsigned long started ) {
/* If profiling is active then record start timestamp */
if ( PROFILING )
profiler->started = started;
}
/** /**
* Start profiling * Start profiling
* *
@ -72,7 +87,23 @@ profile_start ( struct profiler *profiler ) {
/* If profiling is active then record start timestamp */ /* If profiling is active then record start timestamp */
if ( PROFILING ) if ( PROFILING )
profiler->started = profile_timestamp(); profile_start_at ( profiler, profile_timestamp() );
}
/**
* Record profiling result
*
* @v profiler Profiler
* @v stopped Stop timestamp
*/
static inline __attribute__ (( always_inline )) void
profile_stop_at ( struct profiler *profiler, unsigned long stopped ) {
/* If profiling is active then record end timestamp and update stats */
if ( PROFILING ) {
profiler->stopped = stopped;
profile_update ( profiler, ( stopped - profiler->started ) );
}
} }
/** /**
@ -82,13 +113,10 @@ profile_start ( struct profiler *profiler ) {
*/ */
static inline __attribute__ (( always_inline )) void static inline __attribute__ (( always_inline )) void
profile_stop ( struct profiler *profiler ) { profile_stop ( struct profiler *profiler ) {
uint64_t ended;
/* If profiling is active then record end timestamp and update stats */ /* If profiling is active then record end timestamp and update stats */
if ( PROFILING ) { if ( PROFILING )
ended = profile_timestamp(); profile_stop_at ( profiler, profile_timestamp() );
profile_update ( profiler, ( ended - profiler->started ) );
}
} }
#endif /* _IPXE_PROFILE_H */ #endif /* _IPXE_PROFILE_H */