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[profile] Provide methods for profiling individual stages of operations

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Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
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 ) {
unsigned int i;
unsigned long p2r_elapsed;
unsigned long timestamp;
unsigned int discard_d;
/* Profile mode transitions. We want to profile each
* 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++ ) {
profile_start ( &p2r_profiler );
__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 );
p2r_elapsed = ( r2p_profiler.started - p2r_profiler.started );
profile_update ( &p2r_profiler, p2r_elapsed );
profile_stop_at ( &p2r_profiler, timestamp );
}
}