| /* |
| * Copyright (C) 2008 Linus Torvalds |
| */ |
| #include "cache.h" |
| #include "pathspec.h" |
| #include "dir.h" |
| #include "fsmonitor.h" |
| #include "config.h" |
| #include "progress.h" |
| #include "thread-utils.h" |
| #include "repository.h" |
| |
| /* |
| * Mostly randomly chosen maximum thread counts: we |
| * cap the parallelism to 20 threads, and we want |
| * to have at least 500 lstat's per thread for it to |
| * be worth starting a thread. |
| */ |
| #define MAX_PARALLEL (20) |
| #define THREAD_COST (500) |
| |
| struct progress_data { |
| unsigned long n; |
| struct progress *progress; |
| pthread_mutex_t mutex; |
| }; |
| |
| struct thread_data { |
| pthread_t pthread; |
| struct index_state *index; |
| struct pathspec pathspec; |
| struct progress_data *progress; |
| int offset, nr; |
| int t2_nr_lstat; |
| }; |
| |
| static void *preload_thread(void *_data) |
| { |
| int nr, last_nr; |
| struct thread_data *p = _data; |
| struct index_state *index = p->index; |
| struct cache_entry **cep = index->cache + p->offset; |
| struct cache_def cache = CACHE_DEF_INIT; |
| |
| nr = p->nr; |
| if (nr + p->offset > index->cache_nr) |
| nr = index->cache_nr - p->offset; |
| last_nr = nr; |
| |
| do { |
| struct cache_entry *ce = *cep++; |
| struct stat st; |
| |
| if (ce_stage(ce)) |
| continue; |
| if (S_ISGITLINK(ce->ce_mode)) |
| continue; |
| if (ce_uptodate(ce)) |
| continue; |
| if (ce_skip_worktree(ce)) |
| continue; |
| if (ce->ce_flags & CE_FSMONITOR_VALID) |
| continue; |
| if (p->progress && !(nr & 31)) { |
| struct progress_data *pd = p->progress; |
| |
| pthread_mutex_lock(&pd->mutex); |
| pd->n += last_nr - nr; |
| display_progress(pd->progress, pd->n); |
| pthread_mutex_unlock(&pd->mutex); |
| last_nr = nr; |
| } |
| if (!ce_path_match(index, ce, &p->pathspec, NULL)) |
| continue; |
| if (threaded_has_symlink_leading_path(&cache, ce->name, ce_namelen(ce))) |
| continue; |
| p->t2_nr_lstat++; |
| if (lstat(ce->name, &st)) |
| continue; |
| if (ie_match_stat(index, ce, &st, CE_MATCH_RACY_IS_DIRTY|CE_MATCH_IGNORE_FSMONITOR)) |
| continue; |
| ce_mark_uptodate(ce); |
| mark_fsmonitor_valid(index, ce); |
| } while (--nr > 0); |
| if (p->progress) { |
| struct progress_data *pd = p->progress; |
| |
| pthread_mutex_lock(&pd->mutex); |
| display_progress(pd->progress, pd->n + last_nr); |
| pthread_mutex_unlock(&pd->mutex); |
| } |
| cache_def_clear(&cache); |
| return NULL; |
| } |
| |
| void preload_index(struct index_state *index, |
| const struct pathspec *pathspec, |
| unsigned int refresh_flags) |
| { |
| int threads, i, work, offset; |
| struct thread_data data[MAX_PARALLEL]; |
| struct progress_data pd; |
| int t2_sum_lstat = 0; |
| |
| if (!HAVE_THREADS || !core_preload_index) |
| return; |
| |
| threads = index->cache_nr / THREAD_COST; |
| if ((index->cache_nr > 1) && (threads < 2) && git_env_bool("GIT_TEST_PRELOAD_INDEX", 0)) |
| threads = 2; |
| if (threads < 2) |
| return; |
| |
| trace2_region_enter("index", "preload", NULL); |
| |
| trace_performance_enter(); |
| if (threads > MAX_PARALLEL) |
| threads = MAX_PARALLEL; |
| offset = 0; |
| work = DIV_ROUND_UP(index->cache_nr, threads); |
| memset(&data, 0, sizeof(data)); |
| |
| memset(&pd, 0, sizeof(pd)); |
| if (refresh_flags & REFRESH_PROGRESS && isatty(2)) { |
| pd.progress = start_delayed_progress(_("Refreshing index"), index->cache_nr); |
| pthread_mutex_init(&pd.mutex, NULL); |
| } |
| |
| for (i = 0; i < threads; i++) { |
| struct thread_data *p = data+i; |
| int err; |
| |
| p->index = index; |
| if (pathspec) |
| copy_pathspec(&p->pathspec, pathspec); |
| p->offset = offset; |
| p->nr = work; |
| if (pd.progress) |
| p->progress = &pd; |
| offset += work; |
| err = pthread_create(&p->pthread, NULL, preload_thread, p); |
| |
| if (err) |
| die(_("unable to create threaded lstat: %s"), strerror(err)); |
| } |
| for (i = 0; i < threads; i++) { |
| struct thread_data *p = data+i; |
| if (pthread_join(p->pthread, NULL)) |
| die("unable to join threaded lstat"); |
| t2_sum_lstat += p->t2_nr_lstat; |
| } |
| stop_progress(&pd.progress); |
| |
| trace_performance_leave("preload index"); |
| |
| trace2_data_intmax("index", NULL, "preload/sum_lstat", t2_sum_lstat); |
| trace2_region_leave("index", "preload", NULL); |
| } |
| |
| int repo_read_index_preload(struct repository *repo, |
| const struct pathspec *pathspec, |
| unsigned int refresh_flags) |
| { |
| int retval = repo_read_index(repo); |
| |
| preload_index(repo->index, pathspec, refresh_flags); |
| return retval; |
| } |