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Commit | Line | Data |
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671c9b7e LT |
1 | /* |
2 | * Copyright (C) 2008 Linus Torvalds | |
3 | */ | |
4 | #include "cache.h" | |
64acde94 | 5 | #include "pathspec.h" |
429bb40a | 6 | #include "dir.h" |
32a8f510 | 7 | #include "environment.h" |
883e248b | 8 | #include "fsmonitor.h" |
f394e093 | 9 | #include "gettext.h" |
5aacc63f | 10 | #include "config.h" |
ae9af122 | 11 | #include "progress.h" |
e8d40566 | 12 | #include "thread-utils.h" |
e1ff0a32 | 13 | #include "repository.h" |
cb2a5135 | 14 | #include "symlinks.h" |
74ea5c95 | 15 | #include "trace2.h" |
671c9b7e LT |
16 | |
17 | /* | |
18 | * Mostly randomly chosen maximum thread counts: we | |
19 | * cap the parallelism to 20 threads, and we want | |
20 | * to have at least 500 lstat's per thread for it to | |
21 | * be worth starting a thread. | |
22 | */ | |
23 | #define MAX_PARALLEL (20) | |
24 | #define THREAD_COST (500) | |
25 | ||
ae9af122 NTND |
26 | struct progress_data { |
27 | unsigned long n; | |
28 | struct progress *progress; | |
29 | pthread_mutex_t mutex; | |
30 | }; | |
31 | ||
671c9b7e LT |
32 | struct thread_data { |
33 | pthread_t pthread; | |
34 | struct index_state *index; | |
5ab2a2da | 35 | struct pathspec pathspec; |
ae9af122 | 36 | struct progress_data *progress; |
671c9b7e | 37 | int offset, nr; |
8c4b7503 | 38 | int t2_nr_lstat; |
671c9b7e LT |
39 | }; |
40 | ||
41 | static void *preload_thread(void *_data) | |
42 | { | |
ae9af122 | 43 | int nr, last_nr; |
671c9b7e LT |
44 | struct thread_data *p = _data; |
45 | struct index_state *index = p->index; | |
46 | struct cache_entry **cep = index->cache + p->offset; | |
e7c73053 | 47 | struct cache_def cache = CACHE_DEF_INIT; |
671c9b7e LT |
48 | |
49 | nr = p->nr; | |
50 | if (nr + p->offset > index->cache_nr) | |
51 | nr = index->cache_nr - p->offset; | |
ae9af122 | 52 | last_nr = nr; |
671c9b7e LT |
53 | |
54 | do { | |
55 | struct cache_entry *ce = *cep++; | |
56 | struct stat st; | |
57 | ||
58 | if (ce_stage(ce)) | |
59 | continue; | |
125fd984 JH |
60 | if (S_ISGITLINK(ce->ce_mode)) |
61 | continue; | |
671c9b7e LT |
62 | if (ce_uptodate(ce)) |
63 | continue; | |
e596acc2 JH |
64 | if (ce_skip_worktree(ce)) |
65 | continue; | |
883e248b BP |
66 | if (ce->ce_flags & CE_FSMONITOR_VALID) |
67 | continue; | |
ae9af122 NTND |
68 | if (p->progress && !(nr & 31)) { |
69 | struct progress_data *pd = p->progress; | |
70 | ||
71 | pthread_mutex_lock(&pd->mutex); | |
72 | pd->n += last_nr - nr; | |
73 | display_progress(pd->progress, pd->n); | |
74 | pthread_mutex_unlock(&pd->mutex); | |
75 | last_nr = nr; | |
76 | } | |
f9beff03 | 77 | if (!ce_path_match(index, ce, &p->pathspec, NULL)) |
671c9b7e | 78 | continue; |
f62ce3de LT |
79 | if (threaded_has_symlink_leading_path(&cache, ce->name, ce_namelen(ce))) |
80 | continue; | |
8c4b7503 | 81 | p->t2_nr_lstat++; |
671c9b7e LT |
82 | if (lstat(ce->name, &st)) |
83 | continue; | |
883e248b | 84 | if (ie_match_stat(index, ce, &st, CE_MATCH_RACY_IS_DIRTY|CE_MATCH_IGNORE_FSMONITOR)) |
671c9b7e LT |
85 | continue; |
86 | ce_mark_uptodate(ce); | |
b5a81697 | 87 | mark_fsmonitor_valid(index, ce); |
671c9b7e | 88 | } while (--nr > 0); |
ae9af122 NTND |
89 | if (p->progress) { |
90 | struct progress_data *pd = p->progress; | |
91 | ||
92 | pthread_mutex_lock(&pd->mutex); | |
93 | display_progress(pd->progress, pd->n + last_nr); | |
94 | pthread_mutex_unlock(&pd->mutex); | |
95 | } | |
2a608391 | 96 | cache_def_clear(&cache); |
671c9b7e LT |
97 | return NULL; |
98 | } | |
99 | ||
99ce720c BP |
100 | void preload_index(struct index_state *index, |
101 | const struct pathspec *pathspec, | |
102 | unsigned int refresh_flags) | |
671c9b7e LT |
103 | { |
104 | int threads, i, work, offset; | |
105 | struct thread_data data[MAX_PARALLEL]; | |
ae9af122 | 106 | struct progress_data pd; |
8c4b7503 | 107 | int t2_sum_lstat = 0; |
671c9b7e | 108 | |
e8d40566 | 109 | if (!HAVE_THREADS || !core_preload_index) |
671c9b7e LT |
110 | return; |
111 | ||
112 | threads = index->cache_nr / THREAD_COST; | |
5765d97b | 113 | if ((index->cache_nr > 1) && (threads < 2) && git_env_bool("GIT_TEST_PRELOAD_INDEX", 0)) |
3e2c6696 | 114 | threads = 2; |
671c9b7e LT |
115 | if (threads < 2) |
116 | return; | |
8c4b7503 JH |
117 | |
118 | trace2_region_enter("index", "preload", NULL); | |
119 | ||
c46c406a | 120 | trace_performance_enter(); |
671c9b7e LT |
121 | if (threads > MAX_PARALLEL) |
122 | threads = MAX_PARALLEL; | |
123 | offset = 0; | |
98cb6f30 | 124 | work = DIV_ROUND_UP(index->cache_nr, threads); |
5ab2a2da | 125 | memset(&data, 0, sizeof(data)); |
ae9af122 NTND |
126 | |
127 | memset(&pd, 0, sizeof(pd)); | |
128 | if (refresh_flags & REFRESH_PROGRESS && isatty(2)) { | |
129 | pd.progress = start_delayed_progress(_("Refreshing index"), index->cache_nr); | |
130 | pthread_mutex_init(&pd.mutex, NULL); | |
131 | } | |
132 | ||
671c9b7e LT |
133 | for (i = 0; i < threads; i++) { |
134 | struct thread_data *p = data+i; | |
2179045f NTND |
135 | int err; |
136 | ||
671c9b7e | 137 | p->index = index; |
5ab2a2da NTND |
138 | if (pathspec) |
139 | copy_pathspec(&p->pathspec, pathspec); | |
671c9b7e LT |
140 | p->offset = offset; |
141 | p->nr = work; | |
ae9af122 NTND |
142 | if (pd.progress) |
143 | p->progress = &pd; | |
671c9b7e | 144 | offset += work; |
2179045f NTND |
145 | err = pthread_create(&p->pthread, NULL, preload_thread, p); |
146 | ||
147 | if (err) | |
148 | die(_("unable to create threaded lstat: %s"), strerror(err)); | |
671c9b7e LT |
149 | } |
150 | for (i = 0; i < threads; i++) { | |
151 | struct thread_data *p = data+i; | |
152 | if (pthread_join(p->pthread, NULL)) | |
153 | die("unable to join threaded lstat"); | |
8c4b7503 | 154 | t2_sum_lstat += p->t2_nr_lstat; |
671c9b7e | 155 | } |
ae9af122 NTND |
156 | stop_progress(&pd.progress); |
157 | ||
23578904 AD |
158 | if (pathspec) { |
159 | /* earlier we made deep copies for each thread to work with */ | |
160 | for (i = 0; i < threads; i++) | |
161 | clear_pathspec(&data[i].pathspec); | |
162 | } | |
163 | ||
c46c406a | 164 | trace_performance_leave("preload index"); |
8c4b7503 JH |
165 | |
166 | trace2_data_intmax("index", NULL, "preload/sum_lstat", t2_sum_lstat); | |
167 | trace2_region_leave("index", "preload", NULL); | |
671c9b7e LT |
168 | } |
169 | ||
e1ff0a32 NTND |
170 | int repo_read_index_preload(struct repository *repo, |
171 | const struct pathspec *pathspec, | |
172 | unsigned int refresh_flags) | |
671c9b7e | 173 | { |
e1ff0a32 | 174 | int retval = repo_read_index(repo); |
671c9b7e | 175 | |
e1ff0a32 | 176 | preload_index(repo->index, pathspec, refresh_flags); |
671c9b7e LT |
177 | return retval; |
178 | } |