freshlybakedca.ke
Git fork
1/*
2 * Copyright (C) 2008 Linus Torvalds
3 */
4
5#define DISABLE_SIGN_COMPARE_WARNINGS
6
7#include "git-compat-util.h"
8#include "pathspec.h"
9#include "dir.h"
10#include "environment.h"
11#include "fsmonitor.h"
12#include "gettext.h"
13#include "parse.h"
14#include "preload-index.h"
15#include "progress.h"
16#include "read-cache.h"
17#include "thread-utils.h"
18#include "repository.h"
19#include "symlinks.h"
20#include "trace2.h"
21#include "config.h"
22
23/*
24 * Mostly randomly chosen maximum thread counts: we
25 * cap the parallelism to 20 threads, and we want
26 * to have at least 500 lstat's per thread for it to
27 * be worth starting a thread.
28 */
29#define MAX_PARALLEL (20)
30#define THREAD_COST (500)
31
32struct progress_data {
33 unsigned long n;
34 struct progress *progress;
35 pthread_mutex_t mutex;
36};
37
38struct thread_data {
39 pthread_t pthread;
40 struct index_state *index;
41 struct pathspec pathspec;
42 struct progress_data *progress;
43 int offset, nr;
44 int t2_nr_lstat;
45};
46
47static void *preload_thread(void *_data)
48{
49 int nr, last_nr;
50 struct thread_data *p = _data;
51 struct index_state *index = p->index;
52 struct cache_entry **cep = index->cache + p->offset;
53 struct cache_def cache = CACHE_DEF_INIT;
54
55 nr = p->nr;
56 if (nr + p->offset > index->cache_nr)
57 nr = index->cache_nr - p->offset;
58 last_nr = nr;
59
60 do {
61 struct cache_entry *ce = *cep++;
62 struct stat st;
63
64 if (ce_stage(ce))
65 continue;
66 if (S_ISGITLINK(ce->ce_mode))
67 continue;
68 if (ce_uptodate(ce))
69 continue;
70 if (ce_skip_worktree(ce))
71 continue;
72 if (ce->ce_flags & CE_FSMONITOR_VALID)
73 continue;
74 if (p->progress && !(nr & 31)) {
75 struct progress_data *pd = p->progress;
76
77 pthread_mutex_lock(&pd->mutex);
78 pd->n += last_nr - nr;
79 display_progress(pd->progress, pd->n);
80 pthread_mutex_unlock(&pd->mutex);
81 last_nr = nr;
82 }
83 if (!ce_path_match(index, ce, &p->pathspec, NULL))
84 continue;
85 if (threaded_has_symlink_leading_path(&cache, ce->name, ce_namelen(ce)))
86 continue;
87 p->t2_nr_lstat++;
88 if (lstat(ce->name, &st))
89 continue;
90 if (ie_match_stat(index, ce, &st, CE_MATCH_RACY_IS_DIRTY|CE_MATCH_IGNORE_FSMONITOR))
91 continue;
92 ce_mark_uptodate(ce);
93 mark_fsmonitor_valid(index, ce);
94 } while (--nr > 0);
95 if (p->progress) {
96 struct progress_data *pd = p->progress;
97
98 pthread_mutex_lock(&pd->mutex);
99 display_progress(pd->progress, pd->n + last_nr);
100 pthread_mutex_unlock(&pd->mutex);
101 }
102 cache_def_clear(&cache);
103 return NULL;
104}
105
106void preload_index(struct index_state *index,
107 const struct pathspec *pathspec,
108 unsigned int refresh_flags)
109{
110 int threads, i, work, offset;
111 struct thread_data data[MAX_PARALLEL];
112 struct progress_data pd;
113 int t2_sum_lstat = 0;
114 int core_preload_index = 1;
115
116 repo_config_get_bool(index->repo, "core.preloadindex", &core_preload_index);
117
118 if (!HAVE_THREADS || !core_preload_index)
119 return;
120
121 threads = index->cache_nr / THREAD_COST;
122 if ((index->cache_nr > 1) && (threads < 2) && git_env_bool("GIT_TEST_PRELOAD_INDEX", 0))
123 threads = 2;
124 if (threads < 2)
125 return;
126
127 trace2_region_enter("index", "preload", NULL);
128
129 trace_performance_enter();
130 if (threads > MAX_PARALLEL)
131 threads = MAX_PARALLEL;
132 offset = 0;
133 work = DIV_ROUND_UP(index->cache_nr, threads);
134 memset(&data, 0, sizeof(data));
135
136 memset(&pd, 0, sizeof(pd));
137 if (refresh_flags & REFRESH_PROGRESS && isatty(2)) {
138 pd.progress = start_delayed_progress(index->repo,
139 _("Refreshing index"),
140 index->cache_nr);
141 pthread_mutex_init(&pd.mutex, NULL);
142 }
143
144 for (i = 0; i < threads; i++) {
145 struct thread_data *p = data+i;
146 int err;
147
148 p->index = index;
149 if (pathspec)
150 copy_pathspec(&p->pathspec, pathspec);
151 p->offset = offset;
152 p->nr = work;
153 if (pd.progress)
154 p->progress = &pd;
155 offset += work;
156 err = pthread_create(&p->pthread, NULL, preload_thread, p);
157
158 if (err)
159 die(_("unable to create threaded lstat: %s"), strerror(err));
160 }
161 for (i = 0; i < threads; i++) {
162 struct thread_data *p = data+i;
163 if (pthread_join(p->pthread, NULL))
164 die("unable to join threaded lstat");
165 t2_sum_lstat += p->t2_nr_lstat;
166 }
167 stop_progress(&pd.progress);
168
169 if (pathspec) {
170 /* earlier we made deep copies for each thread to work with */
171 for (i = 0; i < threads; i++)
172 clear_pathspec(&data[i].pathspec);
173 }
174
175 trace_performance_leave("preload index");
176
177 trace2_data_intmax("index", NULL, "preload/sum_lstat", t2_sum_lstat);
178 trace2_region_leave("index", "preload", NULL);
179}
180
181int repo_read_index_preload(struct repository *repo,
182 const struct pathspec *pathspec,
183 unsigned int refresh_flags)
184{
185 int retval = repo_read_index(repo);
186
187 preload_index(repo->index, pathspec, refresh_flags);
188 return retval;
189}