diff options
| author | Michal Schmidt <mschmidt@redhat.com> | 2014-12-19 14:42:55 +0100 |
|---|---|---|
| committer | Michal Schmidt <mschmidt@redhat.com> | 2014-12-19 16:15:21 +0100 |
| commit | b29ddfcb389127cf00ab41447a721e479fe15713 (patch) | |
| tree | 53f8001eeadf23229b54cb1c7f91618f065ac6b6 /src | |
| parent | 487d37209b30a536636c95479cfeba931fea25c5 (diff) | |
journal: make next_with_matches() always use f->current_offset
next_with_matches() is odd in that its "unit64_t *offset" parameter is
both input and output. In other it's purely for output.
The function is called from two places in next_beyond_location(). In
both of them "&cp" is used as the argument and in both cases cp is
guaranteed to equal f->current_offset.
Let's just have next_with_matches() ignore "*offset" on input and
operate with f->current_offset.
I did not investigate why it is, but it makes my usual benchmark run
reproducibly faster:
$ time ./journalctl --since=2014-06-01 --until=2014-07-01 > /dev/null
real 0m4.032s
user 0m3.896s
sys 0m0.135s
(Compare to preceding commit, where real was 4.4s.)
Diffstat (limited to 'src')
| -rw-r--r-- | src/journal/sd-journal.c | 13 |
1 files changed, 5 insertions, 8 deletions
diff --git a/src/journal/sd-journal.c b/src/journal/sd-journal.c index 173f9484e7..89cab37331 100644 --- a/src/journal/sd-journal.c +++ b/src/journal/sd-journal.c @@ -697,23 +697,22 @@ static int next_with_matches( Object **ret, uint64_t *offset) { - uint64_t cp; - assert(j); assert(f); assert(ret); assert(offset); - cp = *offset; - /* No matches is easy. We simple advance the file * pointer by one. */ if (!j->level0) - return journal_file_next_entry(f, cp, direction, ret, offset); + return journal_file_next_entry(f, f->current_offset, direction, ret, offset); /* If we have a match then we look for the next matching entry * with an offset at least one step larger */ - return next_for_match(j, j->level0, f, direction == DIRECTION_DOWN ? cp+1 : cp-1, direction, ret, offset); + return next_for_match(j, j->level0, f, + direction == DIRECTION_DOWN ? f->current_offset + 1 + : f->current_offset - 1, + direction, ret, offset); } static int next_beyond_location(sd_journal *j, JournalFile *f, direction_t direction) { @@ -731,8 +730,6 @@ static int next_beyond_location(sd_journal *j, JournalFile *f, direction_t direc f->last_n_entries = n_entries; if (f->last_direction == direction && f->current_offset > 0) { - cp = f->current_offset; - /* LOCATION_SEEK here means we did the work in a previous * iteration and the current location already points to a * candidate entry. */ |