[linux-mm-cc] [UTIL PATCH 2/2] proc entry to select algo (ver2)

[IKEDA Munehiro]

You can read numeric index of algo from /proc/sys/vm/cc_algorithm,
but it isn't understandable.
So this patch modify /proc/ccache_stats to show selected algo name.

I investigted to make cc_algorithm output algo name, but I don't
like asymmetricity of write(index)/out(string).
It is my current conclusion that ccache_stats should show it.

---
 mm/ccache.c |   23 +++++++++++++----------
 1 files changed, 13 insertions(+), 10 deletions(-)

diff --git a/mm/ccache.c b/mm/ccache.c
index fcd205c..1ad0ddb 100644
--- a/mm/ccache.c
+++ b/mm/ccache.c
@@ -404,16 +404,19 @@ static int proc_read_ccache_stats(char *page, char **start, off_t off,
 		return 0;
 	}
 
-	if (!fs_backed_cc_started)
-		goto print_anon;
-	len = sprintf(page,
-		"fs_backed_cc_size: %d\n", atomic_read(&fs_backed_cc_size));
-print_anon:
-	if (!anon_cc_started)
-		goto out;
-	len += sprintf(page + len,
-		"anon_cc_size: %d\n", atomic_read(&anon_cc_size));
-out:
+	if (fs_backed_cc_started || anon_cc_started) {
+		char *name = "cyclic";
+		if (ccache_selected_algo >= 0)
+			name = comp_algo[ccache_selected_algo].name;
+		len = sprintf(page, "compression algorithm: %s (%d)\n",
+				name, ccache_selected_algo);
+		if (fs_backed_cc_started)
+			len += sprintf(page + len, "fs_backed_cc_size: %d\n",
+					atomic_read(&fs_backed_cc_size));
+		if (anon_cc_started)
+			len += sprintf(page + len, "anon_cc_size: %d\n",
+					atomic_read(&anon_cc_size));
+	}
 	return len;
 }
 
-- 
1.4.4.4