Optimised file statting code when scanning for modified pages; cut the number of system calls in half. (Still room for improvement.)

IkiWiki.pm

@@ -282,18 +282,22 @@ sub htmlpage ($) { #{{{
 	return targetpage($page, $config{htmlext});
 } #}}}
 
-sub srcfile ($;$) { #{{{
+sub srcfile_stat { #{{{
 	my $file=shift;
 	my $nothrow=shift;
 
-	return "$config{srcdir}/$file" if -e "$config{srcdir}/$file";
+	return "$config{srcdir}/$file", stat(_) if -e "$config{srcdir}/$file";
 	foreach my $dir (@{$config{underlaydirs}}, $config{underlaydir}) {
-		return "$dir/$file" if -e "$dir/$file";
+		return "$dir/$file", stat(_) if -e "$dir/$file";
 	}
 	error("internal error: $file cannot be found in $config{srcdir} or underlay") unless $nothrow;
 	return;
 } #}}}
 
+sub srcfile ($;$) { #{{{
+	return (srcfile_stat(@_))[0];
+} #}}}
+
 sub add_underlay ($) { #{{{
 	my $dir=shift;
 

IkiWiki/Plugin/inline.pm

@@ -445,7 +445,7 @@ sub genfeed ($$$$@) { #{{{
 				$itemtemplate->param(content => $pcontent);
 			}
 			else {
-				my ($a, $b, $c, $d, $e, $f, $g, $size) = stat(srcfile($file));
+				my $size=(srcfile_stat($file))[8];
 				my $mime="unknown";
 				eval q{use File::MimeInfo};
 				if (! $@) {

IkiWiki/Render.pm

@@ -146,12 +146,6 @@ sub genpage ($$) { #{{{
 	return $content;
 } #}}}
 
-sub mtime ($) { #{{{
-	my $file=shift;
-	
-	return (stat($file))[9];
-} #}}}
-
 sub scan ($) { #{{{
 	my $file=shift;
 
@@ -283,7 +277,7 @@ sub refresh () { #{{{
 			if (file_pruned($_, $config{srcdir})) {
 				$File::Find::prune=1;
 			}
-			elsif (! -d $_ && ! -l $_) {
+			elsif (! -l $_ && ! -d _) {
 				my ($f)=/$config{wiki_file_regexp}/; # untaint
 				if (! defined $f) {
 					warn(sprintf(gettext("skipping bad filename %s"), $_)."\n");
@@ -304,7 +298,7 @@ sub refresh () { #{{{
 				if (file_pruned($_, $dir)) {
 					$File::Find::prune=1;
 				}
-				elsif (! -d $_ && ! -l $_) {
+				elsif (! -l $_ && ! -d _) {
 					my ($f)=/$config{wiki_file_regexp}/; # untaint
 					if (! defined $f) {
 						warn(sprintf(gettext("skipping bad filename %s"), $_)."\n");
@@ -314,8 +308,8 @@ sub refresh () { #{{{
 						# avoid underlaydir
 						# override attacks; see
 						# security.mdwn
-						if (! -e "$config{srcdir}/$f" && 
-						    ! -l "$config{srcdir}/$f") {
+						if (! -l "$config{srcdir}/$f" && 
+						    ! -e _) {
 						    	my $page=pagename($f);
 							if (! $exists{$page}) {
 								push @files, $f;
@@ -329,7 +323,6 @@ sub refresh () { #{{{
 	};
 
 	my (%rendered, @add, @del, @internal);
-
 	# check for added or removed pages
 	foreach my $file (@files) {
 		my $page=pagename($file);
@@ -352,7 +345,7 @@ sub refresh () { #{{{
 			}
 			$pagecase{lc $page}=$page;
 			if (! exists $pagectime{$page}) {
-				$pagectime{$page}=mtime(srcfile($file));
+				$pagectime{$page}=(srcfile_stat($file))[10];
 			}
 		}
 	}
@@ -383,16 +376,15 @@ sub refresh () { #{{{
 	my @needsbuild;
 	foreach my $file (@files) {
 		my $page=pagename($file);
-		
-		my $mtime=mtime(srcfile($file));
+		my ($srcfile, @stat)=srcfile_stat($file);
 		if (! exists $pagemtime{$page} ||
-		    $mtime > $pagemtime{$page} ||
+		    $stat[9] > $pagemtime{$page} ||
 	    	    $forcerebuild{$page}) {
-			$pagemtime{$page}=$mtime;
+			$pagemtime{$page}=$stat[9];
 			if (isinternal($page)) {
 				push @internal, $file;
 				# Preprocess internal page in scan-only mode.
-				preprocess($page, $page, readfile(srcfile($file)), 1);
+				preprocess($page, $page, readfile($srcfile), 1);
 			}
 			else {
 				push @needsbuild, $file;
@@ -535,7 +527,7 @@ sub commandline_render () { #{{{
 	$content=preprocess($page, $page, $content);
 	$content=linkify($page, $page, $content);
 	$content=htmlize($page, $type, $content);
-	$pagemtime{$page}=mtime($srcfile);
+	$pagemtime{$page}=(stat($srcfile))[9];
 
 	print genpage($page, $content);
 	exit 0;

debian/changelog

@@ -5,6 +5,8 @@ ikiwiki (2.46) UNRELEASED; urgency=low
     via the `aggregate_webtrigger` configuration optiom.
   * Add pinger and pingee plugins, which allow setting up mirrors and branched
     wikis that automatically ping one another to stay up to date.
+  * Optimised file statting code when scanning for modified pages;
+    cut the number of system calls in half. (Still room for improvement.)
 
  -- Joey Hess <joeyh@debian.org>  Mon, 05 May 2008 19:34:51 -0400