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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" |
883e248b | 7 | #include "fsmonitor.h" |
5aacc63f | 8 | #include "config.h" |
46059cc6 JH |
9 | |
10 | #ifdef NO_PTHREADS | |
5ab2a2da NTND |
11 | static void preload_index(struct index_state *index, |
12 | const struct pathspec *pathspec) | |
46059cc6 JH |
13 | { |
14 | ; /* nothing */ | |
15 | } | |
16 | #else | |
17 | ||
671c9b7e LT |
18 | #include <pthread.h> |
19 | ||
20 | /* | |
21 | * Mostly randomly chosen maximum thread counts: we | |
22 | * cap the parallelism to 20 threads, and we want | |
23 | * to have at least 500 lstat's per thread for it to | |
24 | * be worth starting a thread. | |
25 | */ | |
26 | #define MAX_PARALLEL (20) | |
27 | #define THREAD_COST (500) | |
28 | ||
29 | struct thread_data { | |
30 | pthread_t pthread; | |
31 | struct index_state *index; | |
5ab2a2da | 32 | struct pathspec pathspec; |
671c9b7e LT |
33 | int offset, nr; |
34 | }; | |
35 | ||
36 | static void *preload_thread(void *_data) | |
37 | { | |
38 | int nr; | |
39 | struct thread_data *p = _data; | |
40 | struct index_state *index = p->index; | |
41 | struct cache_entry **cep = index->cache + p->offset; | |
e7c73053 | 42 | struct cache_def cache = CACHE_DEF_INIT; |
671c9b7e LT |
43 | |
44 | nr = p->nr; | |
45 | if (nr + p->offset > index->cache_nr) | |
46 | nr = index->cache_nr - p->offset; | |
47 | ||
48 | do { | |
49 | struct cache_entry *ce = *cep++; | |
50 | struct stat st; | |
51 | ||
52 | if (ce_stage(ce)) | |
53 | continue; | |
125fd984 JH |
54 | if (S_ISGITLINK(ce->ce_mode)) |
55 | continue; | |
671c9b7e LT |
56 | if (ce_uptodate(ce)) |
57 | continue; | |
e596acc2 JH |
58 | if (ce_skip_worktree(ce)) |
59 | continue; | |
883e248b BP |
60 | if (ce->ce_flags & CE_FSMONITOR_VALID) |
61 | continue; | |
f9beff03 | 62 | if (!ce_path_match(index, ce, &p->pathspec, NULL)) |
671c9b7e | 63 | continue; |
f62ce3de LT |
64 | if (threaded_has_symlink_leading_path(&cache, ce->name, ce_namelen(ce))) |
65 | continue; | |
671c9b7e LT |
66 | if (lstat(ce->name, &st)) |
67 | continue; | |
883e248b | 68 | if (ie_match_stat(index, ce, &st, CE_MATCH_RACY_IS_DIRTY|CE_MATCH_IGNORE_FSMONITOR)) |
671c9b7e LT |
69 | continue; |
70 | ce_mark_uptodate(ce); | |
883e248b | 71 | mark_fsmonitor_valid(ce); |
671c9b7e | 72 | } while (--nr > 0); |
2a608391 | 73 | cache_def_clear(&cache); |
671c9b7e LT |
74 | return NULL; |
75 | } | |
76 | ||
5ab2a2da NTND |
77 | static void preload_index(struct index_state *index, |
78 | const struct pathspec *pathspec) | |
671c9b7e LT |
79 | { |
80 | int threads, i, work, offset; | |
81 | struct thread_data data[MAX_PARALLEL]; | |
ca54d9ba | 82 | uint64_t start = getnanotime(); |
671c9b7e LT |
83 | |
84 | if (!core_preload_index) | |
85 | return; | |
86 | ||
87 | threads = index->cache_nr / THREAD_COST; | |
5aacc63f | 88 | if ((index->cache_nr > 1) && (threads < 2) && git_env_bool("GIT_FORCE_PRELOAD_TEST", 0)) |
3e2c6696 | 89 | threads = 2; |
671c9b7e LT |
90 | if (threads < 2) |
91 | return; | |
92 | if (threads > MAX_PARALLEL) | |
93 | threads = MAX_PARALLEL; | |
94 | offset = 0; | |
98cb6f30 | 95 | work = DIV_ROUND_UP(index->cache_nr, threads); |
5ab2a2da | 96 | memset(&data, 0, sizeof(data)); |
671c9b7e LT |
97 | for (i = 0; i < threads; i++) { |
98 | struct thread_data *p = data+i; | |
99 | p->index = index; | |
5ab2a2da NTND |
100 | if (pathspec) |
101 | copy_pathspec(&p->pathspec, pathspec); | |
671c9b7e LT |
102 | p->offset = offset; |
103 | p->nr = work; | |
104 | offset += work; | |
105 | if (pthread_create(&p->pthread, NULL, preload_thread, p)) | |
106 | die("unable to create threaded lstat"); | |
107 | } | |
108 | for (i = 0; i < threads; i++) { | |
109 | struct thread_data *p = data+i; | |
110 | if (pthread_join(p->pthread, NULL)) | |
111 | die("unable to join threaded lstat"); | |
112 | } | |
ca54d9ba | 113 | trace_performance_since(start, "preload index"); |
671c9b7e | 114 | } |
46059cc6 | 115 | #endif |
671c9b7e | 116 | |
5ab2a2da NTND |
117 | int read_index_preload(struct index_state *index, |
118 | const struct pathspec *pathspec) | |
671c9b7e LT |
119 | { |
120 | int retval = read_index(index); | |
121 | ||
122 | preload_index(index, pathspec); | |
123 | return retval; | |
124 | } |