]>
Commit | Line | Data |
---|---|---|
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" |
46059cc6 JH |
8 | |
9 | #ifdef NO_PTHREADS | |
5ab2a2da NTND |
10 | static void preload_index(struct index_state *index, |
11 | const struct pathspec *pathspec) | |
46059cc6 JH |
12 | { |
13 | ; /* nothing */ | |
14 | } | |
15 | #else | |
16 | ||
671c9b7e LT |
17 | #include <pthread.h> |
18 | ||
19 | /* | |
20 | * Mostly randomly chosen maximum thread counts: we | |
21 | * cap the parallelism to 20 threads, and we want | |
22 | * to have at least 500 lstat's per thread for it to | |
23 | * be worth starting a thread. | |
24 | */ | |
25 | #define MAX_PARALLEL (20) | |
26 | #define THREAD_COST (500) | |
27 | ||
28 | struct thread_data { | |
29 | pthread_t pthread; | |
30 | struct index_state *index; | |
5ab2a2da | 31 | struct pathspec pathspec; |
671c9b7e LT |
32 | int offset, nr; |
33 | }; | |
34 | ||
35 | static void *preload_thread(void *_data) | |
36 | { | |
37 | int nr; | |
38 | struct thread_data *p = _data; | |
39 | struct index_state *index = p->index; | |
40 | struct cache_entry **cep = index->cache + p->offset; | |
e7c73053 | 41 | struct cache_def cache = CACHE_DEF_INIT; |
671c9b7e LT |
42 | |
43 | nr = p->nr; | |
44 | if (nr + p->offset > index->cache_nr) | |
45 | nr = index->cache_nr - p->offset; | |
46 | ||
47 | do { | |
48 | struct cache_entry *ce = *cep++; | |
49 | struct stat st; | |
50 | ||
51 | if (ce_stage(ce)) | |
52 | continue; | |
125fd984 JH |
53 | if (S_ISGITLINK(ce->ce_mode)) |
54 | continue; | |
671c9b7e LT |
55 | if (ce_uptodate(ce)) |
56 | continue; | |
e596acc2 JH |
57 | if (ce_skip_worktree(ce)) |
58 | continue; | |
883e248b BP |
59 | if (ce->ce_flags & CE_FSMONITOR_VALID) |
60 | continue; | |
429bb40a | 61 | if (!ce_path_match(ce, &p->pathspec, NULL)) |
671c9b7e | 62 | continue; |
f62ce3de LT |
63 | if (threaded_has_symlink_leading_path(&cache, ce->name, ce_namelen(ce))) |
64 | continue; | |
671c9b7e LT |
65 | if (lstat(ce->name, &st)) |
66 | continue; | |
883e248b | 67 | if (ie_match_stat(index, ce, &st, CE_MATCH_RACY_IS_DIRTY|CE_MATCH_IGNORE_FSMONITOR)) |
671c9b7e LT |
68 | continue; |
69 | ce_mark_uptodate(ce); | |
883e248b | 70 | mark_fsmonitor_valid(ce); |
671c9b7e | 71 | } while (--nr > 0); |
2a608391 | 72 | cache_def_clear(&cache); |
671c9b7e LT |
73 | return NULL; |
74 | } | |
75 | ||
5ab2a2da NTND |
76 | static void preload_index(struct index_state *index, |
77 | const struct pathspec *pathspec) | |
671c9b7e LT |
78 | { |
79 | int threads, i, work, offset; | |
80 | struct thread_data data[MAX_PARALLEL]; | |
ca54d9ba | 81 | uint64_t start = getnanotime(); |
671c9b7e LT |
82 | |
83 | if (!core_preload_index) | |
84 | return; | |
85 | ||
86 | threads = index->cache_nr / THREAD_COST; | |
3e2c6696 BP |
87 | if ((index->cache_nr > 1) && (threads < 2) && getenv("GIT_FORCE_PRELOAD_TEST")) |
88 | threads = 2; | |
671c9b7e LT |
89 | if (threads < 2) |
90 | return; | |
91 | if (threads > MAX_PARALLEL) | |
92 | threads = MAX_PARALLEL; | |
93 | offset = 0; | |
98cb6f30 | 94 | work = DIV_ROUND_UP(index->cache_nr, threads); |
5ab2a2da | 95 | memset(&data, 0, sizeof(data)); |
671c9b7e LT |
96 | for (i = 0; i < threads; i++) { |
97 | struct thread_data *p = data+i; | |
98 | p->index = index; | |
5ab2a2da NTND |
99 | if (pathspec) |
100 | copy_pathspec(&p->pathspec, pathspec); | |
671c9b7e LT |
101 | p->offset = offset; |
102 | p->nr = work; | |
103 | offset += work; | |
104 | if (pthread_create(&p->pthread, NULL, preload_thread, p)) | |
105 | die("unable to create threaded lstat"); | |
106 | } | |
107 | for (i = 0; i < threads; i++) { | |
108 | struct thread_data *p = data+i; | |
109 | if (pthread_join(p->pthread, NULL)) | |
110 | die("unable to join threaded lstat"); | |
111 | } | |
ca54d9ba | 112 | trace_performance_since(start, "preload index"); |
671c9b7e | 113 | } |
46059cc6 | 114 | #endif |
671c9b7e | 115 | |
5ab2a2da NTND |
116 | int read_index_preload(struct index_state *index, |
117 | const struct pathspec *pathspec) | |
671c9b7e LT |
118 | { |
119 | int retval = read_index(index); | |
120 | ||
121 | preload_index(index, pathspec); | |
122 | return retval; | |
123 | } |