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KPath: Use an object_cache for the path buffers in the normal case.

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This was (following the packagefs changes) the number-one (by call
count) consumer of malloc() during the boot -- 52866 calls, and 100%
of them either 1024 or 1025 bytes!

Virtually all of these are ephemeral (indeed, the object_cache
stats after a boot with this patch shows there is only a single slab
of 64 buffers allocated, and most of them unused), so this is
probably a significant performance boost.

Change-Id: I659f5707510cbfeafa735d35eea7b92732ead666
This commit is contained in:
Augustin Cavalier 2019-07-10 22:49:42 -04:00
parent 9b72c3a089
commit 42e3c6f978
4 changed files with 100 additions and 60 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
headers/private/kernel/fs/KPath.h
View File

@ -23,14 +23,14 @@ public:
LAZY_ALLOC = 0x04
};
public:
KPath(size_t bufferSize = B_PATH_NAME_LENGTH);
KPath(size_t bufferSize = B_PATH_NAME_LENGTH + 1);
KPath(const char* path, int32 flags = DEFAULT,
size_t bufferSize = B_PATH_NAME_LENGTH);
size_t bufferSize = B_PATH_NAME_LENGTH + 1);
KPath(const KPath& other);
~KPath();
status_t SetTo(const char* path, int32 flags = DEFAULT,
size_t bufferSize = B_PATH_NAME_LENGTH);
size_t bufferSize = B_PATH_NAME_LENGTH + 1);
void Adopt(KPath& other);
status_t InitCheck() const;
@ -67,6 +67,7 @@ public:
private:
status_t _AllocateBuffer();
void _FreeBuffer();
status_t _Normalize(const char* path,
bool traverseLeafLink);
void _ChopTrailingSlashes();

2
src/system/kernel/disk_device_manager/KDiskDeviceManager.cpp
View File

@ -197,7 +197,7 @@ public:
if (strcmp(event->name, "raw") == 0) {
// a new raw device was added/removed
KPath path(B_PATH_NAME_LENGTH + 1);
KPath path;
if (path.InitCheck() != B_OK
|| vfs_entry_ref_to_path(event->device, event->directory,
event->name, true, path.LockBuffer(),

48
src/system/kernel/fs/KPath.cpp
View File

@ -15,6 +15,7 @@
#include <team.h>
#include <vfs.h>
#include <slab/Slab.h>
// debugging
@ -22,6 +23,11 @@
//#define TRACE(x) dprintf x
#ifdef _KERNEL_MODE
extern object_cache* sPathNameCache;
#endif
KPath::KPath(size_t bufferSize)
:
fBuffer(NULL),
@ -66,7 +72,7 @@ KPath::KPath(const KPath& other)
KPath::~KPath()
{
free(fBuffer);
_FreeBuffer();
}
@ -74,12 +80,11 @@ status_t
KPath::SetTo(const char* path, int32 flags, size_t bufferSize)
{
if (bufferSize == 0)
bufferSize = B_PATH_NAME_LENGTH;
bufferSize = B_PATH_NAME_LENGTH + 1;
// free the previous buffer, if the buffer size differs
if (fBuffer != NULL && fBufferSize != bufferSize) {
free(fBuffer);
fBuffer = NULL;
_FreeBuffer();
fBufferSize = 0;
}
@ -102,7 +107,7 @@ KPath::SetTo(const char* path, int32 flags, size_t bufferSize)
void
KPath::Adopt(KPath& other)
{
free(fBuffer);
_FreeBuffer();
fBuffer = other.fBuffer;
fBufferSize = other.fBufferSize;
@ -218,7 +223,9 @@ void
KPath::UnlockBuffer()
{
if (!fLocked) {
TRACE(("KPath::UnlockBuffer(): ERROR: Buffer not locked!\n"));
#ifdef _KERNEL_MODE
panic("KPath::UnlockBuffer(): Buffer not locked!");
#endif
return;
}
@ -242,6 +249,12 @@ KPath::DetachBuffer()
{
char* buffer = fBuffer;
if (fBufferSize == (B_PATH_NAME_LENGTH + 1)) {
buffer = (char*)malloc(fBufferSize);
memcpy(buffer, fBuffer, fBufferSize);
_FreeBuffer();
}
if (fBuffer != NULL) {
fBuffer = NULL;
fPathLength = 0;
@ -412,8 +425,14 @@ KPath::operator!=(const char* path) const
status_t
KPath::_AllocateBuffer()
{
if (fBuffer == NULL && fBufferSize != 0)
fBuffer = (char*)malloc(fBufferSize);
if (fBuffer == NULL && fBufferSize != 0) {
#ifdef _KERNEL_MODE
if (fBufferSize == (B_PATH_NAME_LENGTH + 1))
fBuffer = (char*)object_cache_alloc(sPathNameCache, 0);
else
#endif
fBuffer = (char*)malloc(fBufferSize);
}
if (fBuffer == NULL) {
fFailed = true;
return B_NO_MEMORY;
@ -425,6 +444,19 @@ KPath::_AllocateBuffer()
}
void
KPath::_FreeBuffer()
{
#ifdef _KERNEL_MODE
if (fBufferSize == (B_PATH_NAME_LENGTH + 1))
object_cache_free(sPathNameCache, fBuffer, 0);
else
#endif
free(fBuffer);
fBuffer = NULL;
}
status_t
KPath::_Normalize(const char* path, bool traverseLeafLink)
{

103
src/system/kernel/fs/vfs.cpp
View File

@ -44,6 +44,7 @@
#include <KPath.h>
#include <lock.h>
#include <low_resource_manager.h>
#include <slab/Slab.h>
#include <syscalls.h>
#include <syscall_restart.h>
#include <tracing.h>
@ -108,6 +109,7 @@
#endif
object_cache* sPathNameCache;
const static size_t kMaxPathLength = 65536;
// The absolute maximum path length (for getcwd() - this is not depending
// on PATH_MAX
@ -2233,7 +2235,8 @@ vnode_path_to_vnode(struct vnode* vnode, char* path, bool traverseLeafLink,
goto resolve_link_error;
}
buffer = (char*)malloc(bufferSize = B_PATH_NAME_LENGTH);
bufferSize = B_PATH_NAME_LENGTH;
buffer = (char*)object_cache_alloc(sPathNameCache, 0);
if (buffer == NULL) {
status = B_NO_MEMORY;
goto resolve_link_error;
@ -2291,7 +2294,7 @@ vnode_path_to_vnode(struct vnode* vnode, char* path, bool traverseLeafLink,
ioContext, &nextVnode, &lastParentID);
}
free(buffer);
object_cache_free(sPathNameCache, buffer, 0);
if (status != B_OK) {
put_vnode(vnode);
@ -4249,7 +4252,7 @@ vfs_get_vnode_from_path(const char* path, bool kernel, struct vnode** _vnode)
TRACE(("vfs_get_vnode_from_path: entry. path = '%s', kernel %d\n",
path, kernel));
KPath pathBuffer(B_PATH_NAME_LENGTH + 1);
KPath pathBuffer;
if (pathBuffer.InitCheck() != B_OK)
return B_NO_MEMORY;
@ -4346,7 +4349,7 @@ vfs_get_fs_node_from_path(fs_volume* volume, const char* path,
TRACE(("vfs_get_fs_node_from_path(volume = %p, path = \"%s\", kernel %d)\n",
volume, path, kernel));
KPath pathBuffer(B_PATH_NAME_LENGTH + 1);
KPath pathBuffer;
if (pathBuffer.InitCheck() != B_OK)
return B_NO_MEMORY;
@ -4396,7 +4399,7 @@ vfs_read_stat(int fd, const char* path, bool traverseLeafLink,
if (path != NULL) {
// path given: get the stat of the node referred to by (fd, path)
KPath pathBuffer(path, KPath::DEFAULT, B_PATH_NAME_LENGTH + 1);
KPath pathBuffer(path);
if (pathBuffer.InitCheck() != B_OK)
return B_NO_MEMORY;
@ -4598,7 +4601,7 @@ vfs_create_special_node(const char* path, fs_vnode* subVnode, mode_t mode,
if (path) {
// We've got a path. Get the dir vnode and the leaf name.
KPath tmpPathBuffer(B_PATH_NAME_LENGTH + 1);
KPath tmpPathBuffer;
if (tmpPathBuffer.InitCheck() != B_OK)
return B_NO_MEMORY;
@ -5341,6 +5344,11 @@ vfs_init(kernel_args* args)
|| sMountsTable->Init(MOUNTS_HASH_TABLE_SIZE) != B_OK)
panic("vfs_init: error creating mounts hash table\n");
sPathNameCache = create_object_cache("path names",
B_PATH_NAME_LENGTH + 1, 8, NULL, NULL, NULL);
if (sPathNameCache == NULL)
panic("vfs_init: error creating path name object_cache\n");
node_monitor_init();
sRoot = NULL;
@ -8166,7 +8174,7 @@ dev_t
_kern_mount(const char* path, const char* device, const char* fsName,
uint32 flags, const char* args, size_t argsLength)
{
KPath pathBuffer(path, KPath::DEFAULT, B_PATH_NAME_LENGTH + 1);
KPath pathBuffer(path);
if (pathBuffer.InitCheck() != B_OK)
return B_NO_MEMORY;
@ -8177,7 +8185,7 @@ _kern_mount(const char* path, const char* device, const char* fsName,
status_t
_kern_unmount(const char* path, uint32 flags)
{
KPath pathBuffer(path, KPath::DEFAULT, B_PATH_NAME_LENGTH + 1);
KPath pathBuffer(path);
if (pathBuffer.InitCheck() != B_OK)
return B_NO_MEMORY;
@ -8305,7 +8313,7 @@ _kern_open_entry_ref(dev_t device, ino_t inode, const char* name, int openMode,
int
_kern_open(int fd, const char* path, int openMode, int perms)
{
KPath pathBuffer(path, KPath::LAZY_ALLOC, B_PATH_NAME_LENGTH + 1);
KPath pathBuffer(path, KPath::LAZY_ALLOC);
if (pathBuffer.InitCheck() != B_OK)
return B_NO_MEMORY;
@ -8357,7 +8365,7 @@ _kern_open_dir_entry_ref(dev_t device, ino_t inode, const char* name)
int
_kern_open_dir(int fd, const char* path)
{
KPath pathBuffer(path, KPath::LAZY_ALLOC, B_PATH_NAME_LENGTH + 1);
KPath pathBuffer(path, KPath::LAZY_ALLOC);
if (pathBuffer.InitCheck() != B_OK)
return B_NO_MEMORY;
@ -8418,7 +8426,7 @@ _kern_create_dir_entry_ref(dev_t device, ino_t inode, const char* name,
status_t
_kern_create_dir(int fd, const char* path, int perms)
{
KPath pathBuffer(path, KPath::DEFAULT, B_PATH_NAME_LENGTH + 1);
KPath pathBuffer(path, KPath::DEFAULT);
if (pathBuffer.InitCheck() != B_OK)
return B_NO_MEMORY;
@ -8429,7 +8437,7 @@ _kern_create_dir(int fd, const char* path, int perms)
status_t
_kern_remove_dir(int fd, const char* path)
{
KPath pathBuffer(path, KPath::LAZY_ALLOC, B_PATH_NAME_LENGTH + 1);
KPath pathBuffer(path, KPath::LAZY_ALLOC);
if (pathBuffer.InitCheck() != B_OK)
return B_NO_MEMORY;
@ -8458,7 +8466,7 @@ _kern_remove_dir(int fd, const char* path)
status_t
_kern_read_link(int fd, const char* path, char* buffer, size_t* _bufferSize)
{
KPath pathBuffer(path, KPath::LAZY_ALLOC, B_PATH_NAME_LENGTH + 1);
KPath pathBuffer(path, KPath::LAZY_ALLOC);
if (pathBuffer.InitCheck() != B_OK)
return B_NO_MEMORY;
@ -8484,7 +8492,7 @@ _kern_read_link(int fd, const char* path, char* buffer, size_t* _bufferSize)
status_t
_kern_create_symlink(int fd, const char* path, const char* toPath, int mode)
{
KPath pathBuffer(path, KPath::DEFAULT, B_PATH_NAME_LENGTH + 1);
KPath pathBuffer(path);
if (pathBuffer.InitCheck() != B_OK)
return B_NO_MEMORY;
@ -8497,8 +8505,8 @@ status_t
_kern_create_link(int pathFD, const char* path, int toFD, const char* toPath,
bool traverseLeafLink)
{
KPath pathBuffer(path, KPath::DEFAULT, B_PATH_NAME_LENGTH + 1);
KPath toPathBuffer(toPath, KPath::DEFAULT, B_PATH_NAME_LENGTH + 1);
KPath pathBuffer(path);
KPath toPathBuffer(toPath);
if (pathBuffer.InitCheck() != B_OK || toPathBuffer.InitCheck() != B_OK)
return B_NO_MEMORY;
@ -8523,7 +8531,7 @@ _kern_create_link(int pathFD, const char* path, int toFD, const char* toPath,
status_t
_kern_unlink(int fd, const char* path)
{
KPath pathBuffer(path, KPath::DEFAULT, B_PATH_NAME_LENGTH + 1);
KPath pathBuffer(path);
if (pathBuffer.InitCheck() != B_OK)
return B_NO_MEMORY;
@ -8552,8 +8560,8 @@ _kern_unlink(int fd, const char* path)
status_t
_kern_rename(int oldFD, const char* oldPath, int newFD, const char* newPath)
{
KPath oldPathBuffer(oldPath, KPath::DEFAULT, B_PATH_NAME_LENGTH + 1);
KPath newPathBuffer(newPath, KPath::DEFAULT, B_PATH_NAME_LENGTH + 1);
KPath oldPathBuffer(oldPath);
KPath newPathBuffer(newPath);
if (oldPathBuffer.InitCheck() != B_OK || newPathBuffer.InitCheck() != B_OK)
return B_NO_MEMORY;
@ -8565,7 +8573,7 @@ _kern_rename(int oldFD, const char* oldPath, int newFD, const char* newPath)
status_t
_kern_access(int fd, const char* path, int mode, bool effectiveUserGroup)
{
KPath pathBuffer(path, KPath::LAZY_ALLOC, B_PATH_NAME_LENGTH + 1);
KPath pathBuffer(path, KPath::LAZY_ALLOC);
if (pathBuffer.InitCheck() != B_OK)
return B_NO_MEMORY;
@ -8661,7 +8669,7 @@ _kern_write_stat(int fd, const char* path, bool traverseLeafLink,
if (path != NULL) {
// path given: write the stat of the node referred to by (fd, path)
KPath pathBuffer(path, KPath::DEFAULT, B_PATH_NAME_LENGTH + 1);
KPath pathBuffer(path);
if (pathBuffer.InitCheck() != B_OK)
return B_NO_MEMORY;
@ -8689,7 +8697,7 @@ _kern_write_stat(int fd, const char* path, bool traverseLeafLink,
int
_kern_open_attr_dir(int fd, const char* path, bool traverseLeafLink)
{
KPath pathBuffer(path, KPath::LAZY_ALLOC, B_PATH_NAME_LENGTH + 1);
KPath pathBuffer(path, KPath::LAZY_ALLOC);
if (pathBuffer.InitCheck() != B_OK)
return B_NO_MEMORY;
@ -8701,7 +8709,7 @@ int
_kern_open_attr(int fd, const char* path, const char* name, uint32 type,
int openMode)
{
KPath pathBuffer(path, KPath::LAZY_ALLOC, B_PATH_NAME_LENGTH + 1);
KPath pathBuffer(path, KPath::LAZY_ALLOC);
if (pathBuffer.InitCheck() != B_OK)
return B_NO_MEMORY;
@ -8770,7 +8778,7 @@ _kern_getcwd(char* buffer, size_t size)
status_t
_kern_setcwd(int fd, const char* path)
{
KPath pathBuffer(path, KPath::LAZY_ALLOC, B_PATH_NAME_LENGTH + 1);
KPath pathBuffer(path, KPath::LAZY_ALLOC);
if (pathBuffer.InitCheck() != B_OK)
return B_NO_MEMORY;
@ -8854,11 +8862,10 @@ _user_mount(const char* userPath, const char* userDevice,
status_t
_user_unmount(const char* userPath, uint32 flags)
{
KPath pathBuffer(B_PATH_NAME_LENGTH + 1);
if (!IS_USER_ADDRESS(userPath))
return B_BAD_ADDRESS;
KPath pathBuffer;
if (pathBuffer.InitCheck() != B_OK)
return B_NO_MEMORY;
@ -8977,7 +8984,7 @@ _user_entry_ref_to_path(dev_t device, ino_t inode, const char* leaf,
if (!IS_USER_ADDRESS(userPath))
return B_BAD_ADDRESS;
KPath path(B_PATH_NAME_LENGTH + 1);
KPath path;
if (path.InitCheck() != B_OK)
return B_NO_MEMORY;
@ -9020,7 +9027,7 @@ _user_normalize_path(const char* userPath, bool traverseLink, char* buffer)
return B_BAD_ADDRESS;
// copy path from userland
KPath pathBuffer(B_PATH_NAME_LENGTH + 1);
KPath pathBuffer;
if (pathBuffer.InitCheck() != B_OK)
return B_NO_MEMORY;
char* path = pathBuffer.LockBuffer();
@ -9071,7 +9078,7 @@ _user_open_entry_ref(dev_t device, ino_t inode, const char* userName,
int
_user_open(int fd, const char* userPath, int openMode, int perms)
{
KPath path(B_PATH_NAME_LENGTH + 1);
KPath path;
if (path.InitCheck() != B_OK)
return B_NO_MEMORY;
@ -9114,7 +9121,7 @@ _user_open_dir(int fd, const char* userPath)
if (userPath == NULL)
return dir_open(fd, NULL, false);
KPath path(B_PATH_NAME_LENGTH + 1);
KPath path;
if (path.InitCheck() != B_OK)
return B_NO_MEMORY;
@ -9299,7 +9306,7 @@ _user_create_dir_entry_ref(dev_t device, ino_t inode, const char* userName,
status_t
_user_create_dir(int fd, const char* userPath, int perms)
{
KPath pathBuffer(B_PATH_NAME_LENGTH + 1);
KPath pathBuffer;
if (pathBuffer.InitCheck() != B_OK)
return B_NO_MEMORY;
@ -9318,7 +9325,7 @@ _user_create_dir(int fd, const char* userPath, int perms)
status_t
_user_remove_dir(int fd, const char* userPath)
{
KPath pathBuffer(B_PATH_NAME_LENGTH + 1);
KPath pathBuffer;
if (pathBuffer.InitCheck() != B_OK)
return B_NO_MEMORY;
@ -9340,7 +9347,7 @@ status_t
_user_read_link(int fd, const char* userPath, char* userBuffer,
size_t* userBufferSize)
{
KPath pathBuffer(B_PATH_NAME_LENGTH + 1), linkBuffer;
KPath pathBuffer, linkBuffer;
if (pathBuffer.InitCheck() != B_OK || linkBuffer.InitCheck() != B_OK)
return B_NO_MEMORY;
@ -9386,8 +9393,8 @@ status_t
_user_create_symlink(int fd, const char* userPath, const char* userToPath,
int mode)
{
KPath pathBuffer(B_PATH_NAME_LENGTH + 1);
KPath toPathBuffer(B_PATH_NAME_LENGTH + 1);
KPath pathBuffer;
KPath toPathBuffer;
if (pathBuffer.InitCheck() != B_OK || toPathBuffer.InitCheck() != B_OK)
return B_NO_MEMORY;
@ -9411,8 +9418,8 @@ status_t
_user_create_link(int pathFD, const char* userPath, int toFD,
const char* userToPath, bool traverseLeafLink)
{
KPath pathBuffer(B_PATH_NAME_LENGTH + 1);
KPath toPathBuffer(B_PATH_NAME_LENGTH + 1);
KPath pathBuffer;
KPath toPathBuffer;
if (pathBuffer.InitCheck() != B_OK || toPathBuffer.InitCheck() != B_OK)
return B_NO_MEMORY;
@ -9440,7 +9447,7 @@ _user_create_link(int pathFD, const char* userPath, int toFD,
status_t
_user_unlink(int fd, const char* userPath)
{
KPath pathBuffer(B_PATH_NAME_LENGTH + 1);
KPath pathBuffer;
if (pathBuffer.InitCheck() != B_OK)
return B_NO_MEMORY;
@ -9460,8 +9467,8 @@ status_t
_user_rename(int oldFD, const char* userOldPath, int newFD,
const char* userNewPath)
{
KPath oldPathBuffer(B_PATH_NAME_LENGTH + 1);
KPath newPathBuffer(B_PATH_NAME_LENGTH + 1);
KPath oldPathBuffer;
KPath newPathBuffer;
if (oldPathBuffer.InitCheck() != B_OK || newPathBuffer.InitCheck() != B_OK)
return B_NO_MEMORY;
@ -9484,7 +9491,7 @@ _user_rename(int oldFD, const char* userOldPath, int newFD,
status_t
_user_create_fifo(int fd, const char* userPath, mode_t perms)
{
KPath pathBuffer(B_PATH_NAME_LENGTH + 1);
KPath pathBuffer;
if (pathBuffer.InitCheck() != B_OK)
return B_NO_MEMORY;
@ -9580,7 +9587,7 @@ _user_create_pipe(int* userFDs)
status_t
_user_access(int fd, const char* userPath, int mode, bool effectiveUserGroup)
{
KPath pathBuffer(B_PATH_NAME_LENGTH + 1);
KPath pathBuffer;
if (pathBuffer.InitCheck() != B_OK)
return B_NO_MEMORY;
@ -9614,7 +9621,7 @@ _user_read_stat(int fd, const char* userPath, bool traverseLink,
if (!IS_USER_ADDRESS(userPath))
return B_BAD_ADDRESS;
KPath pathBuffer(B_PATH_NAME_LENGTH + 1);
KPath pathBuffer;
if (pathBuffer.InitCheck() != B_OK)
return B_NO_MEMORY;
@ -9671,7 +9678,7 @@ _user_write_stat(int fd, const char* userPath, bool traverseLeafLink,
if (!IS_USER_ADDRESS(userPath))
return B_BAD_ADDRESS;
KPath pathBuffer(B_PATH_NAME_LENGTH + 1);
KPath pathBuffer;
if (pathBuffer.InitCheck() != B_OK)
return B_NO_MEMORY;
@ -9706,7 +9713,7 @@ _user_write_stat(int fd, const char* userPath, bool traverseLeafLink,
int
_user_open_attr_dir(int fd, const char* userPath, bool traverseLeafLink)
{
KPath pathBuffer(B_PATH_NAME_LENGTH + 1);
KPath pathBuffer;
if (pathBuffer.InitCheck() != B_OK)
return B_NO_MEMORY;
@ -9837,7 +9844,7 @@ _user_open_attr(int fd, const char* userPath, const char* userName,
if (status != B_OK)
return status;
KPath pathBuffer(B_PATH_NAME_LENGTH + 1);
KPath pathBuffer;
if (pathBuffer.InitCheck() != B_OK)
return B_NO_MEMORY;
@ -9999,7 +10006,7 @@ _user_setcwd(int fd, const char* userPath)
{
TRACE(("user_setcwd: path = %p\n", userPath));
KPath pathBuffer(B_PATH_NAME_LENGTH);
KPath pathBuffer;
if (pathBuffer.InitCheck() != B_OK)
return B_NO_MEMORY;
@ -10025,7 +10032,7 @@ _user_change_root(const char* userPath)
return B_NOT_ALLOWED;
// alloc path buffer
KPath pathBuffer(B_PATH_NAME_LENGTH);
KPath pathBuffer;
if (pathBuffer.InitCheck() != B_OK)
return B_NO_MEMORY;