[PATCH] Add a new lstat implementation based on Win32 API, and make stat use that implementation too.
This gives us a significant speedup when adding, committing and stat'ing files. (Also, since Windows doesn't really handle symlinks, it's fine that stat just uses lstat)
Signed-off-by: Marius Storm-Olsen <mstormo_git@storm-olsen.com>
---
The following patch will override the normal Posix implementation of stat and
lstat on Windows, and use normal Windows API to ensure we're stat'ing as fast
as possible. With this patch I get the performance increase to the far right.
Initially, I only replaced lstat, since that's what the MinGW port of Git had implemented from before. But, since we don't really care about symlinks on Windows, I decided to simply use the same implementation for stat as well. The performance benefit is clearly indicated in the report below.
With normal lstat & stat lstat, based on Win32 lstat & stat, as Win32
------------------------- ------------------------- -------------------------
Command: git init Command: git init Command: git init
------------------------- ------------------------- -------------------------
real 0m0.047s real 0m0.047s real 0m0.078s
user 0m0.031s user 0m0.031s user 0m0.031s
sys 0m0.000s sys 0m0.000s sys 0m0.000s
------------------------- ------------------------- -------------------------
Command: git add . Command: git add . Command: git add .
------------------------- ------------------------- -------------------------
real 0m19.390s real 0m19.390s real 0m12.187s
user 0m0.015s user 0m0.015s user 0m0.015s
sys 0m0.030s sys 0m0.030s sys 0m0.015s
------------------------- ------------------------- -------------------------
Command: git commit -a... Command: git commit -a... Command: git commit -a...
------------------------- ------------------------- -------------------------
real 0m30.812s real 0m22.547s real 0m17.297s
user 0m0.015s user 0m0.031s user 0m0.015s
sys 0m0.000s sys 0m0.000s sys 0m0.015s
------------------------- ------------------------- -------------------------
3x Command: git-status 3x Command: git-status 3x Command: git-status
------------------------- ------------------------- -------------------------
real 0m11.860s real 0m5.360s real 0m5.344s
user 0m0.015s user 0m0.015s user 0m0.015s
sys 0m0.015s sys 0m0.015s sys 0m0.031s
real 0m11.703s real 0m5.312s real 0m5.390s
user 0m0.015s user 0m0.015s user 0m0.031s
sys 0m0.000s sys 0m0.000s sys 0m0.000s
real 0m11.672s real 0m5.359s real 0m5.344s
user 0m0.031s user 0m0.015s user 0m0.015s
sys 0m0.000s sys 0m0.015s sys 0m0.016s
------------------------- ------------------------- -------------------------
Command: git commit... Command: git commit... Command: git commit...
(single file) (single file) (single file)
------------------------- ------------------------- -------------------------
real 0m14.234s real 0m7.969s real 0m7.875s
user 0m0.015s user 0m0.015s user 0m0.015s
sys 0m0.000s sys 0m0.016s sys 0m0.000s
compat/mingw.c | 52 ++++++++++++++++++++++++++++++++++++++++++++--------
git-compat-util.h | 5 +++++
2 files changed, 49 insertions(+), 8 deletions(-)
diff --git a/compat/mingw.c b/compat/mingw.c
index 7711a3f..207378c 100644
--- a/compat/mingw.c
+++ b/compat/mingw.c
@@ -23,19 +23,52 @@ int fchmod(int fildes, mode_t mode)
return -1;
}
-int lstat(const char *file_name, struct stat *buf)
+static inline time_t filetime_to_time_t(const FILETIME *ft)
+{
+ long long winTime = ((long long)ft->dwHighDateTime << 32) + ft->dwLowDateTime;
+ winTime -= 116444736000000000LL; /* Windows to Unix Epoch conversion */
+ winTime /= 10000000; /* Nano to seconds resolution */
+ return (time_t)winTime;
+}
+
+extern int _getdrive( void );
+int git_lstat(const char *file_name, struct stat *buf)
{
int namelen;
static char alt_name[PATH_MAX];
-
- if (!stat(file_name, buf))
+ char* ext;
+ WIN32_FILE_ATTRIBUTE_DATA fdata;
+
+ if (GetFileAttributesExA(file_name, GetFileExInfoStandard, &fdata)) {
+ int fMode = S_IREAD;
+ if (fdata.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
+ fMode |= S_IFDIR;
+ else {
+ fMode |= S_IFREG;
+ ext = strrchr(file_name, '.');
+ if (ext && (!_stricmp(ext, ".exe") ||
+ !_stricmp(ext, ".com") ||
+ !_stricmp(ext, ".bat") ||
+ !_stricmp(ext, ".cmd")))
+ fMode |= S_IEXEC;
+ }
+ if (!(fdata.dwFileAttributes & FILE_ATTRIBUTE_READONLY))
+ fMode |= S_IWRITE;
+
+ buf->st_ino = 0;
+ buf->st_gid = 0;
+ buf->st_uid = 0;
+ buf->st_nlink = 1;
+ buf->st_mode = fMode;
+ buf->st_size = fdata.nFileSizeLow; /* Can't use nFileSizeHigh, since it's not a stat64 */
+ buf->st_dev = buf->st_rdev = (_getdrive() - 1);
+ buf->st_atime = filetime_to_time_t(&(fdata.ftLastAccessTime));
+ buf->st_mtime = filetime_to_time_t(&(fdata.ftLastWriteTime));
+ buf->st_ctime = filetime_to_time_t(&(fdata.ftCreationTime));
return 0;
+ }
+ errno = ENOENT;
- /* if file_name ended in a '/', Windows returned ENOENT;
- * try again without trailing slashes
- */
- if (errno != ENOENT)
- return -1;
namelen = strlen(file_name);
if (namelen && file_name[namelen-1] != '/')
return -1;
@@ -47,6 +80,9 @@ int lstat(const char *file_name, struct stat *buf)
alt_name[namelen] = 0;
return stat(alt_name, buf);
}
+int git_stat(const char *file_name, struct stat *buf) {
+ return git_lstat(file_name, buf);
+}
/* missing: link, mkstemp, fchmod, getuid (?), gettimeofday */
int socketpair(int d, int type, int protocol, int sv[2])
diff --git a/git-compat-util.h b/git-compat-util.h
index 1ba499f..de1f062 100644
--- a/git-compat-util.h
+++ b/git-compat-util.h
@@ -488,6 +488,11 @@ int mingw_rename(const char*, const char*);
extern void quote_argv(const char **dst, const char **src);
extern const char *parse_interpreter(const char *cmd);
+/* Make git on Windows use git_lstat and git_stat instead of lstat and stat */
+int git_lstat(const char *file_name, struct stat *buf);
+int git_stat(const char *file_name, struct stat *buf);
+#define lstat(x,y) git_lstat(x,y)
+#define stat(x,y) git_stat(x,y)
#endif /* __MINGW32__ */
#endif
--
mingw.v1.5.2.4.1311.g376df-dirty
Marius Storm-Olsen
