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Reduce kmalloc() traffic in directory iteration.

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Pass the file name in a stack-allocated buffer instead of using an AK::String
when iterating directories. This dramatically reduces the amount of cycles
spent traversing the filesystem.
This commit is contained in:
Andreas Kling
2018-11-13 00:17:30 +01:00
parent 5e8e554f94
commit 19b9401487
10 changed files with 60 additions and 40 deletions
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19
VirtualFileSystem/FileSystem.cpp
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@@ -41,7 +41,7 @@ InodeIdentifier FileSystem::childOfDirectoryInodeWithName(InodeIdentifier inode,
{
InodeIdentifier foundInode;
enumerateDirectoryInode(inode, [&] (const DirectoryEntry& entry) {
if (entry.name == name) {
if (!strcmp(entry.name, name.characters())) {
foundInode = entry.inode;
return false;
}
@@ -101,3 +101,20 @@ ByteBuffer FileSystem::readEntireInode(InodeIdentifier inode, FileDescriptor* ha
return contents;
}
FileSystem::DirectoryEntry::DirectoryEntry(const char* n, InodeIdentifier i, byte ft)
: name_length(strlen(name))
, inode(i)
, fileType(ft)
{
memcpy(name, n, name_length);
name[name_length] = '\0';
}
FileSystem::DirectoryEntry::DirectoryEntry(const char* n, Unix::size_t nl, InodeIdentifier i, byte ft)
: name_length(nl)
, inode(i)
, fileType(ft)
{
memcpy(name, n, nl);
name[nl] = '\0';
}