[PATCH i-g-t 1/4] scripts/trace.pl: More hash key optimisations

[John.C.Harrison@Intel.com]

From: John Harrison <John.C.Harrison@Intel.com>

Cache the key count value rather than querying the hash every time.
Also assert that the database does not magically change size after the
fixups.

Signed-off-by: John Harrison <John.C.Harrison@intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
---
 scripts/trace.pl | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/scripts/trace.pl b/scripts/trace.pl
index cb93900d..7b8a920e 100755
--- a/scripts/trace.pl
+++ b/scripts/trace.pl
@@ -508,7 +508,9 @@ foreach my $key (keys %db) {
 }
 
 # Fix up incompletes
-foreach my $key (keys %db) {
+my @keys = keys(%db);
+my $keyCount = scalar(@keys);
+foreach my $key (@keys) {
 	next unless exists $db{$key}->{'incomplete'};
 
 	# End the incomplete batch at the time next one starts
@@ -522,7 +524,7 @@ foreach my $key (keys %db) {
 		$next_key = db_key($ring, $ctx, $seqno + $i);
 		$i++;
 	} until ((exists $db{$next_key} and not exists $db{$next_key}->{'incomplete'})
-		 or $i > scalar(keys(%db)));  # ugly stop hack
+		 or $i > $keyCount);  # ugly stop hack
 
 	if (exists $db{$next_key}) {
 		$db{$key}->{'notify'} = $db{$next_key}->{'end'};
@@ -540,6 +542,7 @@ my $first_ts;
 
 my @sorted_keys = sort {$db{$a}->{'start'} <=> $db{$b}->{'start'}} keys %db;
 my $re_sort = 0;
+die "Database changed size?!" unless scalar(@sorted_keys) == $keyCount;
 
 foreach my $key (@sorted_keys) {
 	my $ring = $db{$key}->{'ring'};
@@ -565,7 +568,7 @@ foreach my $key (@sorted_keys) {
 		do {
 			$next_key = db_key($ring, $ctx, $seqno + $i);
 			$i++;
-		} until (exists $db{$next_key} or $i > scalar(keys(%db)));  # ugly stop hack
+		} until (exists $db{$next_key} or $i > $keyCount);  # ugly stop hack
 
 		# 20us tolerance
 		if (exists $db{$next_key} and $db{$next_key}->{'start'} < $start + 20) {
-- 
2.15.1

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