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authorKjetil Barvik <barvik@broadpark.no>2009-02-23 19:02:57 +0100
committerJunio C Hamano <gitster@pobox.com>2009-02-23 18:04:20 -0800
commite1afca4fd3e7cb4000874e991277f10119de4ad2 (patch)
treec71e47c710fafa7042ebebe3d70a22ae1c125d02 /read-cache.c
parent1dcafcc0e639ecc69b54421bda5f2270ed2601eb (diff)
downloadgit-e1afca4fd3e7cb4000874e991277f10119de4ad2.tar.gz
write_index(): update index_state->timestamp after flushing to disk
Since this timestamp is used to check for racy-clean files, it is important to keep it uptodate. For the 'git checkout' command without the '-q' option, this make a huge difference. Before, each and every file which was updated, was racy-clean after the call to unpack_trees() and write_index() but before the GIT process ended. And because of the call to show_local_changes() in builtin-checkout.c, we ended up reading those files back into memory, doing a SHA1 to check if the files was really different from the index. And, of course, no file was different. With this fix, 'git checkout' without the '-q' option should now be almost as fast as with the '-q' option, but not quite, as we still do some few lstat(2) calls more without the '-q' option. Below is some average numbers for 10 checkout's to v2.6.27 and 10 to v2.6.25 of the Linux kernel, to show the difference: before (git version 1.6.2.rc1.256.g58a87): 7.860 user 2.427 sys 19.465 real 52.8% CPU faults: 0 major 95331 minor after: 6.184 user 2.160 sys 17.619 real 47.4% CPU faults: 0 major 38994 minor Signed-off-by: Kjetil Barvik <barvik@broadpark.no> Signed-off-by: Junio C Hamano <gitster@pobox.com>
Diffstat (limited to 'read-cache.c')
-rw-r--r--read-cache.c12
1 files changed, 10 insertions, 2 deletions
diff --git a/read-cache.c b/read-cache.c
index bb07371597..91f1d03c09 100644
--- a/read-cache.c
+++ b/read-cache.c
@@ -1528,13 +1528,14 @@ static int ce_write_entry(git_SHA_CTX *c, int fd, struct cache_entry *ce)
return ce_write(c, fd, ondisk, size);
}
-int write_index(const struct index_state *istate, int newfd)
+int write_index(struct index_state *istate, int newfd)
{
git_SHA_CTX c;
struct cache_header hdr;
int i, err, removed, extended;
struct cache_entry **cache = istate->cache;
int entries = istate->cache_nr;
+ struct stat st;
for (i = removed = extended = 0; i < entries; i++) {
if (cache[i]->ce_flags & CE_REMOVE)
@@ -1578,7 +1579,14 @@ int write_index(const struct index_state *istate, int newfd)
if (err)
return -1;
}
- return ce_flush(&c, newfd);
+
+ if (ce_flush(&c, newfd) || fstat(newfd, &st))
+ return -1;
+ istate->timestamp.sec = (unsigned int)st.st_ctime;
+#ifdef USE_NSEC
+ istate->timestamp.nsec = (unsigned int)st.st_ctim.tv_nsec;
+#endif
+ return 0;
}
/*