Merge remote-tracking branch 'benpeart/fscache-per-thread-gfw'

This brings substantial wins in performance because the FSCache is now
per-thread, being merged to the primary thread only at the end, so we do
not have to lock (except while merging).

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

builtin/add.c

@@ -461,7 +461,7 @@ int cmd_add(int argc, const char **argv, const char *prefix)
  die_in_unpopulated_submodule(&the_index, prefix);
  die_path_inside_submodule(&the_index, &pathspec);
 
- enable_fscache(1);
+ enable_fscache(0);
  /* We do not really re-read the index but update the up-to-date flags */
  preload_index(&the_index, &pathspec, 0);
 

builtin/checkout.c

@@ -372,7 +372,7 @@ static int checkout_paths(const struct checkout_opts *opts,
  state.istate = &the_index;
 
  enable_delayed_checkout(&state);
- enable_fscache(1);
+ enable_fscache(active_nr);
  for (pos = 0; pos < active_nr; pos++) {
  struct cache_entry *ce = active_cache[pos];
  if (ce->ce_flags & CE_MATCHED) {
@@ -391,7 +391,7 @@ static int checkout_paths(const struct checkout_opts *opts,
  pos = skip_same_name(ce, pos) - 1;
  }
  }
- enable_fscache(0);
+ disable_fscache();
  errs |= finish_delayed_checkout(&state, &nr_checkouts);
 
  if (opts->count_checkout_paths) {

builtin/commit.c

@@ -1366,7 +1366,7 @@ int cmd_status(int argc, const char **argv, const char *prefix)
  PATHSPEC_PREFER_FULL,
  prefix, argv);
 
- enable_fscache(1);
+ enable_fscache(0);
  if (status_format != STATUS_FORMAT_PORCELAIN &&
  status_format != STATUS_FORMAT_PORCELAIN_V2)
  progress_flag = REFRESH_PROGRESS;
@@ -1407,7 +1407,7 @@ int cmd_status(int argc, const char **argv, const char *prefix)
  wt_status_print(&s);
  wt_status_collect_free_buffers(&s);
 
- enable_fscache(0);
+ disable_fscache();
  return 0;
 }