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grep: move driver pre-load out of critical section
In builtin/grep.c:add_work() we pre-load the userdiff drivers before adding the grep_source in the todo list. This operation is currently being performed after acquiring the grep_mutex, but as it's already thread-safe, we don't need to protect it here. So let's move it out of the critical section which should avoid thread contention and improve performance. Running[1] `git grep --threads=8 abcd[02] HEAD` on chromium's repository[2], I got the following mean times for 30 executions after 2 warmups: Original | 6.2886s -------------------------|----------- Out of critical section | 5.7852s [1]: Tests performed on an i7-7700HQ with 16GB of RAM and SSD, running Manjaro Linux. [2]: chromium’s repo at commit 03ae96f (“Add filters testing at DSF=2”, 04-06-2019), after a 'git gc' execution. Signed-off-by: Matheus Tavares <matheus.bernardino@usp.br> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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@ -92,8 +92,11 @@ static pthread_cond_t cond_result;
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static int skip_first_line;
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static void add_work(struct grep_opt *opt, const struct grep_source *gs)
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static void add_work(struct grep_opt *opt, struct grep_source *gs)
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{
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if (opt->binary != GREP_BINARY_TEXT)
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grep_source_load_driver(gs, opt->repo->index);
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grep_lock();
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while ((todo_end+1) % ARRAY_SIZE(todo) == todo_done) {
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@ -101,9 +104,6 @@ static void add_work(struct grep_opt *opt, const struct grep_source *gs)
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}
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todo[todo_end].source = *gs;
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if (opt->binary != GREP_BINARY_TEXT)
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grep_source_load_driver(&todo[todo_end].source,
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opt->repo->index);
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todo[todo_end].done = 0;
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strbuf_reset(&todo[todo_end].out);
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todo_end = (todo_end + 1) % ARRAY_SIZE(todo);
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