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104 lines
2.3 KiB
104 lines
2.3 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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#ifdef NO_PTHREADS |
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static void preload_index(struct index_state *index, const char **pathspec) |
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{ |
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; /* nothing */ |
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} |
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#else |
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#include <pthread.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 thread_data { |
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pthread_t pthread; |
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struct index_state *index; |
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const char **pathspec; |
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int offset, nr; |
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}; |
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static void *preload_thread(void *_data) |
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{ |
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int 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; |
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memset(&cache, 0, sizeof(cache)); |
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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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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 (ce_uptodate(ce)) |
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continue; |
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if (!ce_path_match(ce, p->pathspec)) |
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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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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)) |
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continue; |
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ce_mark_uptodate(ce); |
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} while (--nr > 0); |
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return NULL; |
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} |
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static void preload_index(struct index_state *index, const char **pathspec) |
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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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if (!core_preload_index) |
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return; |
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threads = index->cache_nr / THREAD_COST; |
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if (threads < 2) |
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return; |
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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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for (i = 0; i < threads; i++) { |
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struct thread_data *p = data+i; |
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p->index = index; |
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p->pathspec = pathspec; |
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p->offset = offset; |
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p->nr = work; |
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offset += work; |
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if (pthread_create(&p->pthread, NULL, preload_thread, p)) |
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die("unable to create threaded lstat"); |
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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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} |
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} |
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#endif |
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int read_index_preload(struct index_state *index, const char **pathspec) |
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{ |
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int retval = read_index(index); |
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preload_index(index, pathspec); |
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return retval; |
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}
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