From ade2577d4ce7988f52550db034fe92fffe794938 Mon Sep 17 00:00:00 2001
From: Ben Peart <benpeart@microsoft.com>
Date: Fri, 7 Sep 2018 11:39:57 -0400
Subject: [PATCH] Enable the filesystem cache (fscache) in refresh_index().
On file systems that support it, this can dramatically speed up operations
like add, commit, describe, rebase, reset, rm that would otherwise have to
lstat() every file to "re-match" the stat information in the index to that
of the file system.
On a synthetic repo with 1M files, "git reset" dropped from 52.02 seconds to
14.42 seconds for a savings of 72%.
Signed-off-by: Ben Peart <benpeart@microsoft.com>
---
read-cache.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/read-cache.c b/read-cache.c
index 15d79839c20517..a20649a90f7fc5 100644
--- a/read-cache.c
+++ b/read-cache.c
@@ -1532,6 +1532,7 @@ int refresh_index(struct index_state *istate, unsigned int flags,
typechange_fmt = in_porcelain ? "T\t%s\n" : "%s: needs update\n";
added_fmt = in_porcelain ? "A\t%s\n" : "%s: needs update\n";
unmerged_fmt = in_porcelain ? "U\t%s\n" : "%s: needs merge\n";
+ enable_fscache(1);
/*
* Use the multi-threaded preload_index() to refresh most of the
* cache entries quickly then in the single threaded loop below,
@@ -1626,6 +1627,7 @@ int refresh_index(struct index_state *istate, unsigned int flags,
display_progress(progress, istate->cache_nr);
stop_progress(&progress);
trace_performance_leave("refresh index");
+ enable_fscache(0);
return has_errors;
}