224@samsung.com]
> > > Sent: Tuesday, December 30, 2014 8:32 AM
> > > To: Jaegeuk Kim
> > > Cc: Chao Yu; linux-f2fs-de...@lists.sourceforge.net;
> > > linux-kernel@vger.kernel.org
> > > Subject: Re: [RFC PATCH] f2fs: add extent cache base on rb-tree
&g
ecember 31, 2014 4:26 PM
> > > To: Chao Yu
> > > Cc: 'Changman Lee'; linux-f2fs-de...@lists.sourceforge.net;
> > > linux-kernel@vger.kernel.org
> > > Subject: Re: [RFC PATCH] f2fs: add extent cache base on rb-tree
> > >
> > > Hi Chao,
&g
k Kim
> > Cc: Chao Yu; linux-f2fs-de...@lists.sourceforge.net;
> > linux-kernel@vger.kernel.org
> > Subject: Re: [RFC PATCH] f2fs: add extent cache base on rb-tree
> >
> > Hi all,
> >
> > On Mon, Dec 29, 2014 at 01:23:00PM -0800, Jaegeuk Kim wrote:
>
'; linux-f2fs-de...@lists.sourceforge.net;
> > linux-kernel@vger.kernel.org
> > Subject: Re: [RFC PATCH] f2fs: add extent cache base on rb-tree
> >
> > Hi Chao,
> >
> > On Tue, Dec 30, 2014 at 06:10:21PM +0800, Chao Yu wrote:
> > > Hi Jaegeuk,
&g
ecember 30, 2014 5:23 AM
> > > To: Chao Yu
> > > Cc: 'Changman Lee'; linux-f2fs-de...@lists.sourceforge.net;
> > > linux-kernel@vger.kernel.org
> > > Subject: Re: [RFC PATCH] f2fs: add extent cache base on rb-tree
> > >
> &g
bject: Re: [RFC PATCH] f2fs: add extent cache base on rb-tree
>
> Hi all,
>
> On Mon, Dec 29, 2014 at 01:23:00PM -0800, Jaegeuk Kim wrote:
> > Hi Chao,
> >
> > On Mon, Dec 29, 2014 at 03:19:18PM +0800, Chao Yu wrote:
> >
> > [snip]
> >
> > Nice
'; linux-f2fs-de...@lists.sourceforge.net;
> > linux-kernel@vger.kernel.org
> > Subject: Re: [RFC PATCH] f2fs: add extent cache base on rb-tree
> >
> > Hi Chao,
> >
> > On Mon, Dec 29, 2014 at 03:19:18PM +0800, Chao Yu wrote:
> >
> > [snip]
> &g
Hi Jaegeuk,
> -Original Message-
> From: Jaegeuk Kim [mailto:jaeg...@kernel.org]
> Sent: Tuesday, December 30, 2014 5:23 AM
> To: Chao Yu
> Cc: 'Changman Lee'; linux-f2fs-de...@lists.sourceforge.net;
> linux-kernel@vger.kernel.org
> Subject: Re: [RFC PATCH]
Hi all,
On Mon, Dec 29, 2014 at 01:23:00PM -0800, Jaegeuk Kim wrote:
> Hi Chao,
>
> On Mon, Dec 29, 2014 at 03:19:18PM +0800, Chao Yu wrote:
>
> [snip]
>
> Nice draft. :)
>
> >
> > Please see the draft below.
> >
> > 1) Extent management:
> > If we use global management that managing all ext
Hi Chao,
On Mon, Dec 29, 2014 at 03:19:18PM +0800, Chao Yu wrote:
[snip]
Nice draft. :)
>
> Please see the draft below.
>
> 1) Extent management:
> If we use global management that managing all extents which are from different
> inodes in sbi, we will face with serious lock contention when we
ecember 23, 2014 3:36 PM
> > > To: Chao Yu
> > > Cc: 'Changman Lee'; linux-f2fs-de...@lists.sourceforge.net;
> > > linux-kernel@vger.kernel.org
> > > Subject: Re: [RFC PATCH] f2fs: add extent cache base on rb-tree
> > >
> > > Hi Chao,
&g
'; linux-f2fs-de...@lists.sourceforge.net;
> > linux-kernel@vger.kernel.org
> > Subject: Re: [RFC PATCH] f2fs: add extent cache base on rb-tree
> >
> > Hi Chao,
> >
> > On Tue, Dec 23, 2014 at 11:01:39AM +0800, Chao Yu wrote:
> > > Hi Jaegeuk,
&g
ecember 23, 2014 7:16 AM
> > > To: Chao Yu
> > > Cc: 'Changman Lee'; linux-f2fs-de...@lists.sourceforge.net;
> > > linux-kernel@vger.kernel.org
> > > Subject: Re: [RFC PATCH] f2fs: add extent cache base on rb-tree
> > >
> > > Hi Chao,
>
x-f2fs-de...@lists.sourceforge.net;
> > linux-kernel@vger.kernel.org
> > Subject: Re: [RFC PATCH] f2fs: add extent cache base on rb-tree
> >
> > Hi,
> >
> > On Mon, Dec 22, 2014 at 03:10:30PM +0800, Chao Yu wrote:
> > > Hi Changman,
> > >
>
December 22, 2014 10:03 AM
> > > To: Chao Yu
> > > Cc: Jaegeuk Kim; linux-f2fs-de...@lists.sourceforge.net;
> > > linux-kernel@vger.kernel.org
> > > Subject: Re: [RFC PATCH] f2fs: add extent cache base on rb-tree
> > >
> > > Hi Yu,
> > >
ent: Tuesday, December 23, 2014 7:16 AM
> > > To: Chao Yu
> > > Cc: 'Changman Lee'; linux-f2fs-de...@lists.sourceforge.net;
> > > linux-kernel@vger.kernel.org
> > > Subject: Re: [RFC PATCH] f2fs: add extent cache base on rb-tree
> > >
&
'; linux-f2fs-de...@lists.sourceforge.net;
> > linux-kernel@vger.kernel.org
> > Subject: Re: [RFC PATCH] f2fs: add extent cache base on rb-tree
> >
> > Hi Chao,
> >
> > On Mon, Dec 22, 2014 at 03:10:30PM +0800, Chao Yu wrote:
> > > Hi Changman,
> &
..@lists.sourceforge.net;
> > linux-kernel@vger.kernel.org
> > Subject: Re: [RFC PATCH] f2fs: add extent cache base on rb-tree
> >
> > Hi Yu,
> >
> > Good approach.
>
> Thank you. :)
>
> > As you know, however, f2fs breaks extent itself due to C
December 22, 2014 10:03 AM
> > > To: Chao Yu
> > > Cc: Jaegeuk Kim; linux-f2fs-de...@lists.sourceforge.net;
> > > linux-kernel@vger.kernel.org
> > > Subject: Re: [RFC PATCH] f2fs: add extent cache base on rb-tree
> > >
> > > Hi Yu,
> > >
nux-f2fs-de...@lists.sourceforge.net;
> > linux-kernel@vger.kernel.org
> > Subject: Re: [RFC PATCH] f2fs: add extent cache base on rb-tree
> >
> > Hi Yu,
> >
> > Good approach.
>
> Thank you. :)
>
> > As you know, however, f2fs breaks extent itself du
Hi Changman,
> -Original Message-
> From: Changman Lee [mailto:cm224@samsung.com]
> Sent: Monday, December 22, 2014 10:03 AM
> To: Chao Yu
> Cc: Jaegeuk Kim; linux-f2fs-de...@lists.sourceforge.net;
> linux-kernel@vger.kernel.org
> Subject: Re: [RFC PATCH] f2fs:
Hi Changman,
> -Original Message-
> From: Changman Lee [mailto:cm224@samsung.com]
> Sent: Monday, December 22, 2014 10:03 AM
> To: Chao Yu
> Cc: Jaegeuk Kim; linux-f2fs-de...@lists.sourceforge.net;
> linux-kernel@vger.kernel.org
> Subject: Re: [RFC PATCH] f2fs:
Hi Yu,
Good approach.
As you know, however, f2fs breaks extent itself due to COW.
Unlike other filesystem like btrfs, minimum extent of f2fs could have 4KB
granularity.
So we would have lots of extents per inode and it could lead to overhead
to manage extents.
Anyway, mount option could be alter
Now f2fs have page-block mapping cache which can cache only one extent mapping
between contiguous logical address and physical address.
Normally, this design will work well because f2fs will expand coverage area of
the mapping extent when we write forward sequentially. But when we write data
random
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