git/preload-index.c
Calvin Wan b1bda75173 parse: separate out parsing functions from config.h
The files config.{h,c} contain functions that have to do with parsing,
but not config.

In order to further reduce all-in-one headers, separate out functions in
config.c that do not operate on config into its own file, parse.h,
and update the include directives in the .c files that need only such
functions accordingly.

Signed-off-by: Calvin Wan <calvinwan@google.com>
Signed-off-by: Jonathan Tan <jonathantanmy@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2023-09-29 15:14:57 -07:00

181 lines
4.3 KiB
C

/*
* Copyright (C) 2008 Linus Torvalds
*/
#include "git-compat-util.h"
#include "pathspec.h"
#include "dir.h"
#include "environment.h"
#include "fsmonitor.h"
#include "gettext.h"
#include "parse.h"
#include "preload-index.h"
#include "progress.h"
#include "read-cache.h"
#include "thread-utils.h"
#include "repository.h"
#include "symlinks.h"
#include "trace2.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 progress_data {
unsigned long n;
struct progress *progress;
pthread_mutex_t mutex;
};
struct thread_data {
pthread_t pthread;
struct index_state *index;
struct pathspec pathspec;
struct progress_data *progress;
int offset, nr;
int t2_nr_lstat;
};
static void *preload_thread(void *_data)
{
int nr, last_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;
last_nr = nr;
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->ce_flags & CE_FSMONITOR_VALID)
continue;
if (p->progress && !(nr & 31)) {
struct progress_data *pd = p->progress;
pthread_mutex_lock(&pd->mutex);
pd->n += last_nr - nr;
display_progress(pd->progress, pd->n);
pthread_mutex_unlock(&pd->mutex);
last_nr = nr;
}
if (!ce_path_match(index, ce, &p->pathspec, NULL))
continue;
if (threaded_has_symlink_leading_path(&cache, ce->name, ce_namelen(ce)))
continue;
p->t2_nr_lstat++;
if (lstat(ce->name, &st))
continue;
if (ie_match_stat(index, ce, &st, CE_MATCH_RACY_IS_DIRTY|CE_MATCH_IGNORE_FSMONITOR))
continue;
ce_mark_uptodate(ce);
mark_fsmonitor_valid(index, ce);
} while (--nr > 0);
if (p->progress) {
struct progress_data *pd = p->progress;
pthread_mutex_lock(&pd->mutex);
display_progress(pd->progress, pd->n + last_nr);
pthread_mutex_unlock(&pd->mutex);
}
cache_def_clear(&cache);
return NULL;
}
void preload_index(struct index_state *index,
const struct pathspec *pathspec,
unsigned int refresh_flags)
{
int threads, i, work, offset;
struct thread_data data[MAX_PARALLEL];
struct progress_data pd;
int t2_sum_lstat = 0;
if (!HAVE_THREADS || !core_preload_index)
return;
threads = index->cache_nr / THREAD_COST;
if ((index->cache_nr > 1) && (threads < 2) && git_env_bool("GIT_TEST_PRELOAD_INDEX", 0))
threads = 2;
if (threads < 2)
return;
trace2_region_enter("index", "preload", NULL);
trace_performance_enter();
if (threads > MAX_PARALLEL)
threads = MAX_PARALLEL;
offset = 0;
work = DIV_ROUND_UP(index->cache_nr, threads);
memset(&data, 0, sizeof(data));
memset(&pd, 0, sizeof(pd));
if (refresh_flags & REFRESH_PROGRESS && isatty(2)) {
pd.progress = start_delayed_progress(_("Refreshing index"), index->cache_nr);
pthread_mutex_init(&pd.mutex, NULL);
}
for (i = 0; i < threads; i++) {
struct thread_data *p = data+i;
int err;
p->index = index;
if (pathspec)
copy_pathspec(&p->pathspec, pathspec);
p->offset = offset;
p->nr = work;
if (pd.progress)
p->progress = &pd;
offset += work;
err = pthread_create(&p->pthread, NULL, preload_thread, p);
if (err)
die(_("unable to create threaded lstat: %s"), strerror(err));
}
for (i = 0; i < threads; i++) {
struct thread_data *p = data+i;
if (pthread_join(p->pthread, NULL))
die("unable to join threaded lstat");
t2_sum_lstat += p->t2_nr_lstat;
}
stop_progress(&pd.progress);
if (pathspec) {
/* earlier we made deep copies for each thread to work with */
for (i = 0; i < threads; i++)
clear_pathspec(&data[i].pathspec);
}
trace_performance_leave("preload index");
trace2_data_intmax("index", NULL, "preload/sum_lstat", t2_sum_lstat);
trace2_region_leave("index", "preload", NULL);
}
int repo_read_index_preload(struct repository *repo,
const struct pathspec *pathspec,
unsigned int refresh_flags)
{
int retval = repo_read_index(repo);
preload_index(repo->index, pathspec, refresh_flags);
return retval;
}