This patch changes the policy of submitting read bios at ra_nat_pages.
Previously, f2fs submits small read bios with block plugging.
But, with this patch, f2fs itself merges read bios first and then submits a
large bio, which can reduce the bio handling overheads.
Signed-off-by: Jaegeuk Kim
---
Hi,
> > >
> > > >
> > > > The ra_sit_pages() tries to read consecutive sit pages as many as
> > > > possible.
> > > > So then, what about just checking whether its block address is
> > > > contiguous or not?
> > > >
> > > > Something like this:
> > > > -ra_sit_pages()
> > > > blkno = star
On 11/21/2013 01:46 PM, Chao Yu wrote:
> Hi Gu,
>
>> -Original Message-
>> From: Gu Zheng [mailto:guz.f...@cn.fujitsu.com]
>> Sent: Wednesday, November 20, 2013 5:38 PM
>> To: Chao Yu
>> Cc: '???'; linux-fsde...@vger.kernel.org; linux-ker...@vger.kernel.org;
>> linux-f2fs-devel@lists.sou
It is not efficient comparing each segment type to find node or data.
Signed-off-by: Changman Lee
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fs/f2fs/segment.h |6 ++
1 file changed, 2 insertions(+), 4 deletions(-)
diff --git a/fs/f2fs/segment.h b/fs/f2fs/segment.h
index 269f690..4ace569 100644
--- a/fs/f2fs/segment.h
+++ b/f
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
How about doing mark_page_accessed(page) in ra_nat_pages like
ra_sit_pages to prevent readahead pages are reclaimed by VM?
On 목, 2013-11-21 at 18:35 +0900, Jaegeuk Kim wrote:
> This patch changes the policy of submitting read bios at ra_nat_pages.
>
> Previously, f2fs submits small read bios wit
Let's send REQ_META or REQ_PRIO when reading meta area such as NAT/SIT
etc.
Signed-off-by: Changman Lee
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fs/f2fs/checkpoint.c |2 +-
fs/f2fs/node.c |4 ++--
fs/f2fs/segment.c|4 ++--
3 files changed, 5 insertions(+), 5 deletions(-)
diff --git a/fs/f2fs/checkpoint.c b/fs
If cp has no CP_UMOUNT_FLAG, we will read all pages in whole node segment
one by one, it makes low performance. So let's merge contiguous pages and
readahead for better performance.
Signed-off-by: Chao Yu
---
fs/f2fs/node.c | 89 +++-
1 fil
