linux-kernel - RE: [f2fs-dev] [PATCH V3 2/2] f2fs: read contiguous sit entry pages by merging for mount performance

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Date:	Mon, 25 Nov 2013 09:33:12 +0800
From:	Chao Yu <chao2.yu@...sung.com>
To:	jaegeuk.kim@...sung.com
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-f2fs-devel@...ts.sourceforge.net,
	'谭姝' <shu.tan@...sung.com>
Subject: RE: [f2fs-dev] [PATCH V3 2/2] f2fs: read contiguous sit entry pages by
 merging for mount performance

Hi,

> -----Original Message-----
> From: Jaegeuk Kim [mailto:jaegeuk.kim@...sung.com]
> Sent: Sunday, November 24, 2013 12:26 PM
> To: Chao Yu
> Cc: linux-fsdevel@...r.kernel.org; linux-kernel@...r.kernel.org; linux-f2fs-devel@...ts.sourceforge.net; 谭姝
> Subject: Re: [f2fs-dev] [PATCH V3 2/2] f2fs: read contiguous sit entry pages by merging for mount performance
> 
> Hi,
> 
> 2013-11-22 (금), 09:09 +0800, Chao Yu:
> > Previously we read sit entries page one by one, this method lost the chance
> > of reading contiguous page together. So we read pages as contiguous as
> > possible for better mount performance.
> >
> > change log:
> >  o merge judgements/use 'Continue' or 'Break' instead of 'Goto' as Gu Zheng
> >    suggested.
> >  o add mark_page_accessed() before release page to delay VM reclaiming.
> >  o remove '*order' for simplification of function as Jaegeuk Kim suggested.
> >
> > Signed-off-by: Chao Yu <chao2.yu@...sung.com>
> > ---
> >  fs/f2fs/segment.c |  103 +++++++++++++++++++++++++++++++++++++++--------------
> >  fs/f2fs/segment.h |    2 ++
> >  2 files changed, 78 insertions(+), 27 deletions(-)
> >
> > diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
> > index 8149eba..998e7d3 100644
> > --- a/fs/f2fs/segment.c
> > +++ b/fs/f2fs/segment.c
> > @@ -14,6 +14,7 @@
> >  #include <linux/blkdev.h>
> >  #include <linux/prefetch.h>
> >  #include <linux/vmalloc.h>
> > +#include <linux/swap.h>
> >
> >  #include "f2fs.h"
> >  #include "segment.h"
> > @@ -1488,41 +1489,89 @@ static int build_curseg(struct f2fs_sb_info *sbi)
> >  	return restore_curseg_summaries(sbi);
> >  }
> >
> > +static int ra_sit_pages(struct f2fs_sb_info *sbi, int start, int nrpages)
> > +{
> > +	struct address_space *mapping = sbi->meta_inode->i_mapping;
> > +	struct page *page;
> > +	block_t blk_addr, prev_blk_addr = 0;
> > +	int sit_blk_cnt = SIT_BLK_CNT(sbi);
> > +	int blkno = start;
> > +
> > +	for (; blkno < start + nrpages && blkno < sit_blk_cnt; blkno++) {
> > +
> > +		blk_addr = current_sit_addr(sbi, start * SIT_ENTRY_PER_BLOCK);
> 
> Should be:
> 	blk_addr = current_sit_addr(sbi, blkno * SIT_ENTRY_PER_BLOCK);
> 	                                -------
> I'll fix this and merge the patch though.
> Thanks,

Oh, It's my mistake, sorry for that.
Thanks for your review! :)

> 
> --
> Jaegeuk Kim
> Samsung

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