From: Joe Perches <joe@perches.com>
To: Alexey Dobriyan <adobriyan@gmail.com>, akpm@linux-foundation.org
Cc: linux-kernel@vger.kernel.org
Subject: Re: [PATCH 01/13] seq_file: rewrite seq_puts() in terms of seq_write()
Date: Tue, 28 Aug 2018 11:24:34 -0700 [thread overview]
Message-ID: <9229927125ab9d36bd38cf0c20fb5dfb45802fcb.camel@perches.com> (raw)
In-Reply-To: <20180827231503.26899-1-adobriyan@gmail.com>
On Tue, 2018-08-28 at 02:14 +0300, Alexey Dobriyan wrote:
> Space savings -- 42 bytes!
>
> seq_puts 71 29 [-42]
>
> Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
> ---
> fs/seq_file.c | 9 +--------
> 1 file changed, 1 insertion(+), 8 deletions(-)
>
> diff --git a/fs/seq_file.c b/fs/seq_file.c
> index 1dea7a8a5255..0c282a88a896 100644
> --- a/fs/seq_file.c
> +++ b/fs/seq_file.c
> @@ -653,14 +653,7 @@ EXPORT_SYMBOL(seq_putc);
>
> void seq_puts(struct seq_file *m, const char *s)
> {
> - int len = strlen(s);
> -
> - if (m->count + len >= m->size) {
> - seq_set_overflow(m);
> - return;
> - }
> - memcpy(m->buf + m->count, s, len);
> - m->count += len;
> + seq_write(m, s, strlen(s));
> }
> EXPORT_SYMBOL(seq_puts);
>
If execution speed is really an issue, as
almost all of the uses are for const strings,
why not use a #define and avoid the runtime
cost of strlen where possible.
next prev parent reply other threads:[~2018-08-28 18:24 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-08-27 23:14 [PATCH 01/13] seq_file: rewrite seq_puts() in terms of seq_write() Alexey Dobriyan
2018-08-27 23:14 ` [PATCH 02/13] proc: apply seq_puts() whenever possible Alexey Dobriyan
2018-08-27 23:14 ` [PATCH 03/13] proc: rename "p" variable in proc_readfd_common() Alexey Dobriyan
2018-08-27 23:14 ` [PATCH 04/13] proc: rename "p" variable in proc_map_files_readdir() Alexey Dobriyan
2018-08-27 23:14 ` [PATCH 05/13] proc: new and improved way to print decimals Alexey Dobriyan
2018-08-27 23:14 ` [PATCH 06/13] proc: convert /proc/self to _print_integer() Alexey Dobriyan
2018-08-29 9:50 ` David Laight
2018-08-30 13:13 ` Alexey Dobriyan
2018-08-27 23:14 ` [PATCH 07/13] proc: convert /proc/thread-self " Alexey Dobriyan
2018-08-27 23:14 ` [PATCH 08/13] proc: convert /proc/*/fd " Alexey Dobriyan
2018-08-27 23:14 ` [PATCH 09/13] proc: convert dentry flushing on exit " Alexey Dobriyan
2018-08-27 23:15 ` [PATCH 10/13] proc: convert readdir /proc " Alexey Dobriyan
2018-08-27 23:15 ` [PATCH 11/13] proc: readdir /proc/*/task Alexey Dobriyan
2018-08-28 12:36 ` Ahmed S. Darwish
2018-08-28 13:04 ` Ahmed S. Darwish
2018-08-28 19:35 ` Alexey Dobriyan
2018-08-29 23:43 ` Andrew Morton
2018-08-30 13:20 ` Alexey Dobriyan
2018-08-28 19:31 ` Alexey Dobriyan
2018-08-27 23:15 ` [PATCH 12/13] proc: convert /proc/*/statm to _print_integer() Alexey Dobriyan
2018-08-27 23:15 ` [PATCH 13/13] proc: convert /proc/*/task/*/children " Alexey Dobriyan
2018-08-28 18:24 ` Joe Perches [this message]
2018-08-28 20:48 ` [PATCH 01/13] seq_file: rewrite seq_puts() in terms of seq_write() Joe Perches
2018-09-03 14:17 ` Alexey Dobriyan
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=9229927125ab9d36bd38cf0c20fb5dfb45802fcb.camel@perches.com \
--to=joe@perches.com \
--cc=adobriyan@gmail.com \
--cc=akpm@linux-foundation.org \
--cc=linux-kernel@vger.kernel.org \
/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;
as well as URLs for NNTP newsgroup(s).