Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1162919

[PATCH] ext4: mballoc: avoid 20-argument function call

Show all headers | View raw

Making a function call with 20 arguments is rather expensive in both
stack and .text. In this case, doing the formatting manually doesn't
make it any less readable, so we might as well save 155 bytes of .text
and 112 bytes of stack.

Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
---
 fs/ext4/mballoc.c | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index 8d1e60214ef0..a74bbbd6d57d 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -2257,12 +2257,9 @@ static int ext4_mb_seq_groups_show(struct seq_file *seq, void *v)
 
 	group--;
 	if (group == 0)
-		seq_printf(seq, "#%-5s: %-5s %-5s %-5s "
-				"[ %-5s %-5s %-5s %-5s %-5s %-5s %-5s "
-				  "%-5s %-5s %-5s %-5s %-5s %-5s %-5s ]\n",
-			   "group", "free", "frags", "first",
-			   "2^0", "2^1", "2^2", "2^3", "2^4", "2^5", "2^6",
-			   "2^7", "2^8", "2^9", "2^10", "2^11", "2^12", "2^13");
+		seq_puts(seq, "#group: free  frags first ["
+			      " 2^0   2^1   2^2   2^3   2^4   2^5   2^6  "
+			      " 2^7   2^8   2^9   2^10  2^11  2^12  2^13  ]");
 
 	i = (sb->s_blocksize_bits + 2) * sizeof(sg.info.bb_counters[0]) +
 		sizeof(struct ext4_group_info);
-- 
2.1.3

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Back to linux.kernel | Previous | Next — Next in thread | Find similar | Unroll thread

Thread

[PATCH] ext4: mballoc: avoid 20-argument function call Rasmus Villemoes <linux@rasmusvillemoes.dk> - 2015-06-11 00:30 +0200
  Re: ext4: mballoc: avoid 20-argument function call Theodore Ts'o <tytso@mit.edu> - 2015-06-15 06:40 +0200

csiph-web