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