From: Jia He <hejianet@gmail.com>
To: xfs@oss.sgi.com
Cc: Jia He <hejianet@gmail.com>, Brian Foster <bfoster@redhat.com>
Subject: [PATCH] libxfs: Optimize the loop for xfs_bitmap_empty
Date: Mon, 9 Nov 2015 22:31:22 +0800 [thread overview]
Message-ID: <1447079482-10650-1-git-send-email-hejianet@gmail.com> (raw)
If there is any non zero bit in a long bitmap, it can jump out of the for
loop and finish the function as soon as possible.
Signed-off-by: Jia He <hejianet@gmail.com>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Brian Foster <bfoster@redhat.com>
---
fs/xfs/libxfs/xfs_bit.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/fs/xfs/libxfs/xfs_bit.c b/fs/xfs/libxfs/xfs_bit.c
index 0e8885a..84614b0 100644
--- a/fs/xfs/libxfs/xfs_bit.c
+++ b/fs/xfs/libxfs/xfs_bit.c
@@ -36,6 +36,8 @@ xfs_bitmap_empty(uint *map, uint size)
for (i = 0; i < size; i++) {
ret |= map[i];
+ if (ret != 0)
+ return 0;
}
return (ret == 0);
--
2.5.0
_______________________________________________
xfs mailing list
xfs@oss.sgi.com
http://oss.sgi.com/mailman/listinfo/xfs
next reply other threads:[~2015-11-09 14:32 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-11-09 14:31 Jia He [this message]
2015-11-10 12:54 ` [PATCH] libxfs: Optimize the loop for xfs_bitmap_empty Brian Foster
2015-11-11 6:37 ` hejianet
2015-11-11 7:49 ` [PATCH v2] " Jia He
2015-11-11 12:48 ` Brian Foster
2015-12-16 3:04 ` hejianet
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1447079482-10650-1-git-send-email-hejianet@gmail.com \
--to=hejianet@gmail.com \
--cc=bfoster@redhat.com \
--cc=xfs@oss.sgi.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox