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From: Chandan Rajendra <chandan@linux.vnet.ibm.com>
To: linux-btrfs@vger.kernel.org
Cc: Chandan Rajendra <chandan@linux.vnet.ibm.com>,
	aneesh.kumar@linux.vnet.ibm.com
Subject: [PATCH 5/6] Btrfs: subpagesize-blocksize: Hardcode MAX_EXTENT_BUFFERS_PER_PAGE to 2.
Date: Wed, 12 Mar 2014 19:50:32 +0530	[thread overview]
Message-ID: <1394634033-2528-6-git-send-email-chandan@linux.vnet.ibm.com> (raw)
In-Reply-To: <1394634033-2528-1-git-send-email-chandan@linux.vnet.ibm.com>

With 2k blocksize the maximum number extent buffers per page will be 2. We
should be computing this value at runtime. For now, Let's work with the
hardcoded value.

Signed-off-by: Chandan Rajendra <chandan@linux.vnet.ibm.com>
---
 fs/btrfs/extent_io.h | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/fs/btrfs/extent_io.h b/fs/btrfs/extent_io.h
index 71100ad..6cc5ed2 100644
--- a/fs/btrfs/extent_io.h
+++ b/fs/btrfs/extent_io.h
@@ -123,7 +123,12 @@ struct extent_state {
 
 #define INLINE_EXTENT_BUFFER_PAGES 16
 #define MAX_INLINE_EXTENT_BUFFER_SIZE (INLINE_EXTENT_BUFFER_PAGES * PAGE_CACHE_SIZE)
-#define MAX_EXTENT_BUFFERS_PER_PAGE 16
+
+#if 0
+#define MAX_EXTENT_BUFFERS_PER_PAGE 1
+#else
+#define MAX_EXTENT_BUFFERS_PER_PAGE 2
+#endif
 
 struct extent_buffer {
 	u64 start;
-- 
1.8.3.1


  parent reply	other threads:[~2014-03-12 14:21 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-03-12 14:20 [PATCH 0/6 EARLY RFC] Btrfs: Get rid of whole page I/O Chandan Rajendra
2014-03-12 14:20 ` [PATCH 1/6] Btrfs: subpagesize-blocksize: Get rid of whole page reads Chandan Rajendra
2014-03-19  7:37   ` Liu Bo
2014-03-19 15:50     ` chandan Rajendra
2014-03-12 14:20 ` [PATCH 2/6] Btrfs: subpagesize-blocksize: Get rid of whole page writes Chandan Rajendra
2014-03-12 14:20 ` [PATCH 3/6] Btrfs: subpagesize-blocksize: Work with extents aligned to blocksize Chandan Rajendra
2014-03-12 14:20 ` [PATCH 4/6] Btrfs: subpagesize-blocksize: Define extent_buffer_head Chandan Rajendra
2014-03-12 14:20 ` Chandan Rajendra [this message]
2014-03-12 14:20 ` [PATCH 6/6] Btrfs: subpagesize-blocksize: Allow mounting filesystems where sectorsize != PAGE_SIZE Chandan Rajendra
2014-03-17 14:55 ` [PATCH 0/6 EARLY RFC] Btrfs: Get rid of whole page I/O David Sterba
2014-03-18  7:18   ` chandan
2014-03-19 18:41     ` David Sterba
2014-03-20  3:20       ` Aneesh Kumar K.V
2014-04-03 17:01         ` David Sterba

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