gvfs:trace2:data: add vfs stats

Report virtual filesystem summary data.

Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com>

virtualfilesystem.c

@@ -1,6 +1,8 @@
 #include "git-compat-util.h"
 #include "environment.h"
 #include "gettext.h"
+#include "repository.h"
+#include "trace2.h"
 #include "cache.h"
 #include "config.h"
 #include "dir.h"
@@ -257,6 +259,11 @@ void apply_virtualfilesystem(struct index_state *istate)
 {
 	char *buf, *entry;
 	int i;
+	int nr_unknown = 0;
+	int nr_vfs_dirs = 0;
+	int nr_vfs_rows = 0;
+	int nr_bulk_skip = 0;
+	int nr_explicit_skip = 0;
 
 	if (!git_config_get_virtualfilesystem())
 		return;
@@ -274,35 +281,63 @@ void apply_virtualfilesystem(struct index_state *istate)
 		if (buf[i] == '\0') {
 			int pos, len;
 
+			nr_vfs_rows++;
+
 			len = buf + i - entry;
 
 			/* look for a directory wild card (ie "dir1/") */
 			if (buf[i - 1] == '/') {
+				nr_vfs_dirs++;
 				if (ignore_case)
 					adjust_dirname_case(istate, entry);
 				pos = index_name_pos(istate, entry, len);
 				if (pos < 0) {
 					pos = -pos - 1;
 					while (pos < istate->cache_nr && !fspathncmp(istate->cache[pos]->name, entry, len)) {
+						if (istate->cache[pos]->ce_flags & CE_SKIP_WORKTREE)
+							nr_bulk_skip++;
 						istate->cache[pos]->ce_flags &= ~CE_SKIP_WORKTREE;
 						pos++;
 					}
 				}
 			} else {
 				if (ignore_case) {
 					struct cache_entry *ce = index_file_exists(istate, entry, len, ignore_case);
-					if (ce)
+					if (ce) {
+						if (ce->ce_flags & CE_SKIP_WORKTREE)
+							nr_explicit_skip++;
 						ce->ce_flags &= ~CE_SKIP_WORKTREE;
+					}
+					else {
+						nr_unknown++;
+					}
 				} else {
 					int pos = index_name_pos(istate, entry, len);
-					if (pos >= 0)
+					if (pos >= 0) {
+						if (istate->cache[pos]->ce_flags & CE_SKIP_WORKTREE)
+							nr_explicit_skip++;
 						istate->cache[pos]->ce_flags &= ~CE_SKIP_WORKTREE;
+					}
+					else {
+						nr_unknown++;
+					}
 				}
 			}
 
 			entry += len + 1;
 		}
 	}
+
+	if (nr_vfs_rows > 0) {
+		trace2_data_intmax("vfs", the_repository, "apply/tracked", nr_bulk_skip + nr_explicit_skip);
+
+		trace2_data_intmax("vfs", the_repository, "apply/vfs_rows", nr_vfs_rows);
+		trace2_data_intmax("vfs", the_repository, "apply/vfs_dirs", nr_vfs_dirs);
+
+		trace2_data_intmax("vfs", the_repository, "apply/nr_unknown", nr_unknown);
+		trace2_data_intmax("vfs", the_repository, "apply/nr_bulk_skip", nr_bulk_skip);
+		trace2_data_intmax("vfs", the_repository, "apply/nr_explicit_skip", nr_explicit_skip);
+	}
 }
 
 /*