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| author | Kjetil Barvik <barvik@broadpark.no> | 2009-02-23 19:02:57 +0100 |
|---|---|---|
| committer | Junio C Hamano <gitster@pobox.com> | 2009-02-23 18:04:20 -0800 |
| commit | e1afca4fd3e7cb4000874e991277f10119de4ad2 (patch) | |
| tree | c71e47c710fafa7042ebebe3d70a22ae1c125d02 | |
| parent | 1dcafcc0e639ecc69b54421bda5f2270ed2601eb (diff) | |
| download | git-e1afca4fd3e7cb4000874e991277f10119de4ad2.tar.gz git-e1afca4fd3e7cb4000874e991277f10119de4ad2.tar.xz | |
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>
| -rw-r--r-- | cache.h | 2 | ||||
| -rw-r--r-- | read-cache.c | 12 |
2 files changed, 11 insertions, 3 deletions
@@ -430,7 +430,7 @@ extern int read_index_preload(struct index_state *, const char **pathspec); extern int read_index_from(struct index_state *, const char *path); extern int is_index_unborn(struct index_state *); extern int read_index_unmerged(struct index_state *); -extern int write_index(const struct index_state *, int newfd); +extern int write_index(struct index_state *, int newfd); extern int discard_index(struct index_state *); extern int unmerged_index(const struct index_state *); extern int verify_path(const char *path); diff --git a/read-cache.c b/read-cache.c index bb0737159..91f1d03c0 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; } /* |