---
read-cache.c | 30 ++++++++++++++++++++++++++++++
1 file changed, 30 insertions(+)
diff --git a/read-cache.c b/read-cache.c
index 9e742c7..3100a59 100644
--- a/read-cache.c
+++ b/read-cache.c
@@ -1462,6 +1462,35 @@ static struct cache_entry *create_from_disk(struct ondisk_cache_entry *ondisk,
return ce;
}
+static void *try_shm(void *mmap, size_t mmap_size)
+{
+ struct strbuf sb = STRBUF_INIT;
+ void *new_mmap;
+ struct stat st;
+ int fd;
+
+ if (mmap_size <= 20)
+ return mmap;
+
+ strbuf_addf(&sb, "/git-index-%s",
+ sha1_to_hex((unsigned char *)mmap + mmap_size - 20));
+ fd = shm_open(sb.buf, O_RDONLY, 0777);
+ strbuf_release(&sb);
+ if (fd < 0)
+ return mmap;
+ if (fstat(fd, &st) || st.st_size != mmap_size) {
+ close(fd);
+ return mmap;
+ }
+ new_mmap = xmmap(NULL, mmap_size, PROT_READ, MAP_PRIVATE, fd, 0);
+ close(fd);
+ if (new_mmap == MAP_FAILED)
+ return mmap;
+ munmap(mmap, mmap_size);
+ return new_mmap;
+}
+
+
/* remember to discard_cache() before reading a different cache! */
int do_read_index(struct index_state *istate, const char *path, int must_exist)
{
@@ -1501,6 +1530,7 @@ int do_read_index(struct index_state *istate, const char *path, int must_exist)
}
close(fd);
+ mmap = try_shm(mmap, mmap_size);
hdr = mmap;
if (verify_hdr(hdr, mmap_size) < 0)
goto unmap;
--
1.9.1.346.ga2b5940
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