From: Minchan Kim <minchan@kernel.org>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: linux-kernel@vger.kernel.org, Nitin Gupta <ngupta@vflare.org>,
Jerome Marchand <jmarchan@redhat.com>,
Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Subject: Re: [PATCH 4/7] zram: use atomic operation for stat
Date: Tue, 14 Jan 2014 09:19:35 +0900 [thread overview]
Message-ID: <20140114001935.GW1992@bbox> (raw)
In-Reply-To: <20140113155814.07ab74c8f77179fc770a8e5f@linux-foundation.org>
On Mon, Jan 13, 2014 at 03:58:14PM -0800, Andrew Morton wrote:
> On Mon, 13 Jan 2014 20:18:59 +0900 Minchan Kim <minchan@kernel.org> wrote:
>
> > Some of fields in zram->stats are protected by zram->lock which
> > is rather coarse-grained so let's use atomic operation without
> > explict locking.
>
> Confused. The patch didn't remove any locking, so it made the code
> slower.
True but it could make remove dependency of zram->lock for 32bit stat
so further patches can remove messy code and enhance write performance.
So, it's preparing patch for further step.
Should I rewrite the description to explain this?
>
> --
> 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/
--
Kind regards,
Minchan Kim
next prev parent reply other threads:[~2014-01-14 0:18 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-01-13 11:18 [PATCH 0/7] zram bug fix and lock redesign Minchan Kim
2014-01-13 11:18 ` [PATCH 1/7] zram: fix race between reset and flushing pending work Minchan Kim
2014-01-13 23:55 ` Andrew Morton
2014-01-14 0:15 ` Minchan Kim
2014-01-14 7:14 ` Sergey Senozhatsky
2014-01-13 11:18 ` [PATCH 2/7] zram: delay pending free request in read path Minchan Kim
2014-01-13 11:18 ` [PATCH 3/7] zram: remove unnecessary free Minchan Kim
2014-01-13 11:18 ` [PATCH 4/7] zram: use atomic operation for stat Minchan Kim
2014-01-13 23:58 ` Andrew Morton
2014-01-14 0:19 ` Minchan Kim [this message]
2014-01-14 0:23 ` Andrew Morton
2014-01-14 0:38 ` Minchan Kim
2014-01-13 11:19 ` [PATCH 5/7] zram: introduce zram->tb_lock Minchan Kim
2014-01-13 11:19 ` [PATCH 6/7] zram: remove workqueue for freeing removed pending slot Minchan Kim
2014-01-13 19:42 ` Sergey Senozhatsky
2014-01-13 23:38 ` Minchan Kim
2014-01-14 7:09 ` Sergey Senozhatsky
2014-01-13 11:19 ` [PATCH 7/7] zram: remove unnecessary lock Minchan Kim
2014-01-14 9:29 ` Jerome Marchand
2014-01-15 1:34 ` Minchan Kim
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=20140114001935.GW1992@bbox \
--to=minchan@kernel.org \
--cc=akpm@linux-foundation.org \
--cc=jmarchan@redhat.com \
--cc=linux-kernel@vger.kernel.org \
--cc=ngupta@vflare.org \
--cc=sergey.senozhatsky@gmail.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