Merge branch 'ns/trace2-fsync-stat'

Trace2 code has been taught to report stats for fsync operations.

* ns/trace2-fsync-stat:
  trace2: add stats for fsync operations

4 files changed, 22 insertions, 0 deletions

diff --git a/git-compat-util.h b/git-compat-util.h
index 0892e209a2..4d444dca27 100644
--- a/git-compat-util.h
+++ b/git-compat-util.h
@@ -1282,6 +1282,11 @@ enum fsync_action {
 int git_fsync(int fd, enum fsync_action action);
 
 /*
+ * Writes out trace statistics for fsync using the trace2 API.
+ */
+void trace_git_fsync_stats(void);
+
+/*
  * Preserves errno, prints a message, but gives no warning for ENOENT.
  * Returns 0 on success, which includes trying to unlink an object that does
  * not exist.
diff --git a/t/t0211/scrub_perf.perl b/t/t0211/scrub_perf.perl
index d164b750ff..299999f0f8 100644
--- a/t/t0211/scrub_perf.perl
+++ b/t/t0211/scrub_perf.perl
@@ -59,6 +59,10 @@ while (<>) {
 	    # and highly variable.  Just omit them.
 	    goto SKIP_LINE;
 	}
+	if ($tokens[$col_category] =~ m/fsync/) {
+	    # fsync events aren't interesting for the test
+	    goto SKIP_LINE;
+	}
     }
 
     # t_abs and t_rel are either blank or a float.  Replace the float
diff --git a/trace2.c b/trace2.c
index 179caa72cf..e01cf77f1a 100644
--- a/trace2.c
+++ b/trace2.c
@@ -214,6 +214,7 @@ int trace2_cmd_exit_fl(const char *file, int line, int code)
 	if (!trace2_enabled)
 		return code;
 
+	trace_git_fsync_stats();
 	trace2_collect_process_info(TRACE2_PROCESS_INFO_EXIT);
 
 	tr2main_exit_code = code;
diff --git a/wrapper.c b/wrapper.c
index 354d784c03..f512994690 100644
--- a/wrapper.c
+++ b/wrapper.c
@@ -4,6 +4,9 @@
 #include "cache.h"
 #include "config.h"
 
+static intmax_t count_fsync_writeout_only;
+static intmax_t count_fsync_hardware_flush;
+
 #ifdef HAVE_RTLGENRANDOM
 /* This is required to get access to RtlGenRandom. */
 #define SystemFunction036 NTAPI SystemFunction036
@@ -564,6 +567,7 @@ int git_fsync(int fd, enum fsync_action action)
 {
 	switch (action) {
 	case FSYNC_WRITEOUT_ONLY:
+		count_fsync_writeout_only += 1;
 
 #ifdef __APPLE__
 		/*
@@ -595,6 +599,8 @@ int git_fsync(int fd, enum fsync_action action)
 		return -1;
 
 	case FSYNC_HARDWARE_FLUSH:
+		count_fsync_hardware_flush += 1;
+
 		/*
 		 * On macOS, a special fcntl is required to really flush the
 		 * caches within the storage controller. As of this writing,
@@ -610,6 +616,12 @@ int git_fsync(int fd, enum fsync_action action)
 	}
 }
 
+void trace_git_fsync_stats(void)
+{
+	trace2_data_intmax("fsync", the_repository, "fsync/writeout-only", count_fsync_writeout_only);
+	trace2_data_intmax("fsync", the_repository, "fsync/hardware-flush", count_fsync_hardware_flush);
+}
+
 static int warn_if_unremovable(const char *op, const char *file, int rc)
 {
 	int err;