[<prev] [next>] [<thread-prev] [day] [month] [year] [list]
Message-id: <002301cf89d4$97aaf7f0$c700e7d0$@samsung.com>
Date: Tue, 17 Jun 2014 10:33:12 +0800
From: Chao Yu <chao2.yu@...sung.com>
To: 'Jaegeuk Kim' <jaegeuk@...nel.org>
Cc: linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-f2fs-devel@...ts.sourceforge.net
Subject: RE: [f2fs-dev] [PATCH] f2fs: refactor flush_nat_entries codes for
reducing NAT writes
Hi all,
There are problem in this patch, please ignore this patch, sorry for the noise.
I will resend later.
> -----Original Message-----
> From: Chao Yu [mailto:chao2.yu@...sung.com]
> Sent: Saturday, June 14, 2014 7:48 PM
> To: Jaegeuk Kim
> Cc: linux-fsdevel@...r.kernel.org; linux-kernel@...r.kernel.org;
> linux-f2fs-devel@...ts.sourceforge.net
> Subject: [f2fs-dev] [PATCH] f2fs: refactor flush_nat_entries codes for reducing NAT writes
>
> Although building NAT journal in cursum reduce the read/write work for NAT
> block, but previous design leave us lower performance when write checkpoint
> frequently for these cases:
> 1. if journal in cursum has already full, it's a bit of waste that we flush all
> nat entries to page for persistence, but not to cache any entries.
> 2. if journal in cursum is not full, we fill nat entries to journal util
> journal is full, then flush the left dirty entries to disk without merge
> journaled entries, so these journaled entries may be flushed to disk at next
> checkpoint but lost chance to flushed last time.
>
> In this patch we merge dirty entries located in same NAT block to nat entry set,
> and linked all set to list, sorted ascending order by entries' count of set.
> Later we flush entries in sparse set into journal as many as we can, and then
> flush merged entries to disk.
>
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists