|
/* |
|
* Copyright (C) 2008 Linus Torvalds |
|
*/ |
|
#include "cache.h" |
|
#include "pathspec.h" |
|
#include "dir.h" |
|
|
|
#ifdef NO_PTHREADS |
|
static void preload_index(struct index_state *index, |
|
const struct pathspec *pathspec) |
|
{ |
|
; /* nothing */ |
|
} |
|
#else |
|
|
|
#include <pthread.h> |
|
|
|
/* |
|
* Mostly randomly chosen maximum thread counts: we |
|
* cap the parallelism to 20 threads, and we want |
|
* to have at least 500 lstat's per thread for it to |
|
* be worth starting a thread. |
|
*/ |
|
#define MAX_PARALLEL (20) |
|
#define THREAD_COST (500) |
|
|
|
struct thread_data { |
|
pthread_t pthread; |
|
struct index_state *index; |
|
struct pathspec pathspec; |
|
int offset, nr; |
|
}; |
|
|
|
static void *preload_thread(void *_data) |
|
{ |
|
int nr; |
|
struct thread_data *p = _data; |
|
struct index_state *index = p->index; |
|
struct cache_entry **cep = index->cache + p->offset; |
|
struct cache_def cache = CACHE_DEF_INIT; |
|
|
|
nr = p->nr; |
|
if (nr + p->offset > index->cache_nr) |
|
nr = index->cache_nr - p->offset; |
|
|
|
do { |
|
struct cache_entry *ce = *cep++; |
|
struct stat st; |
|
|
|
if (ce_stage(ce)) |
|
continue; |
|
if (S_ISGITLINK(ce->ce_mode)) |
|
continue; |
|
if (ce_uptodate(ce)) |
|
continue; |
|
if (ce_skip_worktree(ce)) |
|
continue; |
|
if (!ce_path_match(ce, &p->pathspec, NULL)) |
|
continue; |
|
if (threaded_has_symlink_leading_path(&cache, ce->name, ce_namelen(ce))) |
|
continue; |
|
if (lstat(ce->name, &st)) |
|
continue; |
|
if (ie_match_stat(index, ce, &st, CE_MATCH_RACY_IS_DIRTY)) |
|
continue; |
|
ce_mark_uptodate(ce); |
|
} while (--nr > 0); |
|
cache_def_clear(&cache); |
|
return NULL; |
|
} |
|
|
|
static void preload_index(struct index_state *index, |
|
const struct pathspec *pathspec) |
|
{ |
|
int threads, i, work, offset; |
|
struct thread_data data[MAX_PARALLEL]; |
|
|
|
if (!core_preload_index) |
|
return; |
|
|
|
threads = index->cache_nr / THREAD_COST; |
|
if (threads < 2) |
|
return; |
|
if (threads > MAX_PARALLEL) |
|
threads = MAX_PARALLEL; |
|
offset = 0; |
|
work = DIV_ROUND_UP(index->cache_nr, threads); |
|
memset(&data, 0, sizeof(data)); |
|
for (i = 0; i < threads; i++) { |
|
struct thread_data *p = data+i; |
|
p->index = index; |
|
if (pathspec) |
|
copy_pathspec(&p->pathspec, pathspec); |
|
p->offset = offset; |
|
p->nr = work; |
|
offset += work; |
|
if (pthread_create(&p->pthread, NULL, preload_thread, p)) |
|
die("unable to create threaded lstat"); |
|
} |
|
for (i = 0; i < threads; i++) { |
|
struct thread_data *p = data+i; |
|
if (pthread_join(p->pthread, NULL)) |
|
die("unable to join threaded lstat"); |
|
} |
|
} |
|
#endif |
|
|
|
int read_index_preload(struct index_state *index, |
|
const struct pathspec *pathspec) |
|
{ |
|
int retval = read_index(index); |
|
|
|
preload_index(index, pathspec); |
|
return retval; |
|
} |
Cannot retrieve contributors at this time
