From: Kim Gybels <kgybels@xxxxxxxxxxxx>
Take a hint from commit ea68b0ce9f8 (hash-object: don't use mmap() for
small files, 2010-02-21) and use read() instead of mmap() for small
packed-refs files.
Signed-off-by: Kim Gybels <kgybels@xxxxxxxxxxxx>
Signed-off-by: Junio C Hamano <gitster@xxxxxxxxx>
Signed-off-by: Michael Haggerty <mhagger@xxxxxxxxxxxx>
---
refs/packed-backend.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/refs/packed-backend.c b/refs/packed-backend.c
index e829cf206d..8b4b45da67 100644
--- a/refs/packed-backend.c
+++ b/refs/packed-backend.c
@@ -458,6 +458,8 @@ static void verify_buffer_safe(struct snapshot *snapshot)
last_line, eof - last_line);
}
+#define SMALL_FILE_SIZE (32*1024)
+
/*
* Depending on `mmap_strategy`, either mmap or read the contents of
* the `packed-refs` file into the snapshot. Return 1 if the file
@@ -495,7 +497,7 @@ static int load_contents(struct snapshot *snapshot)
if (!size) {
return 0;
- } else if (mmap_strategy == MMAP_NONE) {
+ } else if (mmap_strategy == MMAP_NONE || size <= SMALL_FILE_SIZE) {
snapshot->buf = xmalloc(size);
bytes_read = read_in_full(fd, snapshot->buf, size);
if (bytes_read < 0 || bytes_read != size)
--
2.14.2
