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From: Jim Rees <rees@umich.edu>
To: linux-nfs@vger.kernel.org
Cc: peter honeyman <honey@citi.umich.edu>
Subject: [PATCH 33/34] Add configurable prefetch size for layoutget
Date: Sun, 12 Jun 2011 19:45:09 -0400	[thread overview]
Message-ID: <5e62a78152b0dbe63b6a675a1f209679bc6f3d18.1307921138.git.rees@umich.edu> (raw)
In-Reply-To: <cover.1307921137.git.rees@umich.edu>

From: Peng Tao <peng_tao@emc.com>

pnfs_layout_prefetch_kb can be modified via sysctl.
default to 0 so no effect if not set via sysctl.

Signed-off-by: Peng Tao <peng_tao@emc.com>
---
 fs/nfs/pnfs.c   |   17 +++++++++++++++++
 fs/nfs/pnfs.h   |    1 +
 fs/nfs/sysctl.c |   10 ++++++++++
 3 files changed, 28 insertions(+), 0 deletions(-)

diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c
index 48a06a1..7b0c8dd 100644
--- a/fs/nfs/pnfs.c
+++ b/fs/nfs/pnfs.c
@@ -46,6 +46,11 @@ static DEFINE_SPINLOCK(pnfs_spinlock);
  */
 static LIST_HEAD(pnfs_modules_tbl);
 
+/*
+ * layoutget prefetch size
+ */
+unsigned int pnfs_layout_prefetch_kb = 0;
+
 /* Return the registered pnfs layout driver module matching given id */
 static struct pnfs_layoutdriver_type *
 find_pnfs_driver_locked(u32 id)
@@ -908,6 +913,16 @@ pnfs_find_lseg(struct pnfs_layout_hdr *lo,
 }
 
 /*
+ * Set layout prefetch length.
+ */
+static void
+pnfs_set_layout_prefetch(struct pnfs_layout_range *range)
+{
+	if (range->length < (pnfs_layout_prefetch_kb << 10))
+		range->length = pnfs_layout_prefetch_kb << 10;
+}
+
+/*
  * Layout segment is retreived from the server if not cached.
  * The appropriate layout segment is referenced and returned to the caller.
  */
@@ -958,6 +973,8 @@ pnfs_update_layout(struct inode *ino,
 
 	if (pnfs_layoutgets_blocked(lo, NULL, 0))
 		goto out_unlock;
+
+	pnfs_set_layout_prefetch(&arg);
 	atomic_inc(&lo->plh_outstanding);
 
 	get_layout_hdr(lo);
diff --git a/fs/nfs/pnfs.h b/fs/nfs/pnfs.h
index 5048898..e12a77de 100644
--- a/fs/nfs/pnfs.h
+++ b/fs/nfs/pnfs.h
@@ -179,6 +179,7 @@ extern int nfs4_proc_layoutget(struct nfs4_layoutget *lgp);
 extern int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp);
 
 /* pnfs.c */
+extern unsigned int pnfs_layout_prefetch_kb;
 void get_layout_hdr(struct pnfs_layout_hdr *lo);
 void put_lseg(struct pnfs_layout_segment *lseg);
 struct pnfs_layout_segment *
diff --git a/fs/nfs/sysctl.c b/fs/nfs/sysctl.c
index 978aaeb..79a5134 100644
--- a/fs/nfs/sysctl.c
+++ b/fs/nfs/sysctl.c
@@ -14,6 +14,7 @@
 #include <linux/nfs_fs.h>
 
 #include "callback.h"
+#include "pnfs.h"
 
 #ifdef CONFIG_NFS_V4
 static const int nfs_set_port_min = 0;
@@ -42,6 +43,15 @@ static ctl_table nfs_cb_sysctls[] = {
 	},
 #endif /* CONFIG_NFS_USE_NEW_IDMAPPER */
 #endif
+#ifdef CONFIG_NFS_V4_1
+	{
+		.procname	= "pnfs_layout_prefetch_kb",
+		.data		= &pnfs_layout_prefetch_kb,
+		.maxlen		= sizeof(pnfs_layout_prefetch_kb),
+		.mode		= 0644,
+		.proc_handler	= proc_dointvec,
+	},
+#endif
 	{
 		.procname	= "nfs_mountpoint_timeout",
 		.data		= &nfs_mountpoint_expiry_timeout,
-- 
1.7.4.1


  parent reply	other threads:[~2011-06-12 23:45 UTC|newest]

Thread overview: 58+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-06-12 23:43 [PATCH 00/34] pnfs block layout driver based on v3.0-rc2 Jim Rees
2011-06-12 23:43 ` [PATCH 01/34] pnfs: GETDEVICELIST Jim Rees
2011-06-12 23:43 ` [PATCH 02/34] pnfs: add set-clear layoutdriver interface Jim Rees
2011-06-12 23:43 ` [PATCH 03/34] pnfs: let layoutcommit code handle multiple segments Jim Rees
2011-06-13 14:36   ` Fred Isaman
2011-06-14 10:40     ` tao.peng
2011-06-14 13:58       ` Fred Isaman
2011-06-14 14:28       ` Benny Halevy
2011-06-12 23:43 ` [PATCH 04/34] pnfs: hook nfs_write_begin/end to allow layout driver manipulation Jim Rees
2011-06-13 14:44   ` Fred Isaman
2011-06-14 11:01     ` tao.peng
2011-06-14 14:05       ` Fred Isaman
2011-06-14 15:53         ` Peng Tao
2011-06-14 16:02           ` Fred Isaman
2011-06-12 23:43 ` [PATCH 05/34] pnfs: ask for layout_blksize and save it in nfs_server Jim Rees
2011-06-14 15:01   ` Benny Halevy
2011-06-14 15:08     ` Peng Tao
2011-06-12 23:44 ` [PATCH 06/34] pnfs: cleanup_layoutcommit Jim Rees
2011-06-13 21:19   ` Benny Halevy
2011-06-14 15:16     ` Peng Tao
2011-06-14 15:10   ` Benny Halevy
2011-06-14 15:21     ` Peng Tao
2011-06-14 15:19   ` Benny Halevy
2011-06-12 23:44 ` [PATCH 07/34] pnfsblock: define PNFS_BLOCK Kconfig option Jim Rees
2011-06-14 15:13   ` Benny Halevy
2011-06-12 23:44 ` [PATCH 08/34] pnfsblock: blocklayout stub Jim Rees
2011-06-12 23:44 ` [PATCH 09/34] pnfsblock: layout alloc and free Jim Rees
2011-06-12 23:44 ` [PATCH 10/34] Add support for simple rpc pipefs Jim Rees
2011-06-12 23:44 ` [PATCH 11/34] pnfs-block: Add block device discovery pipe Jim Rees
2011-06-12 23:44 ` [PATCH 12/34] pnfsblock: basic extent code Jim Rees
2011-06-12 23:44 ` [PATCH 13/34] pnfsblock: add device operations Jim Rees
2011-06-12 23:44 ` [PATCH 14/34] pnfsblock: remove " Jim Rees
2011-06-12 23:44 ` [PATCH 15/34] pnfsblock: lseg alloc and free Jim Rees
2011-06-12 23:44 ` [PATCH 16/34] pnfsblock: merge extents Jim Rees
2011-06-12 23:44 ` [PATCH 17/34] pnfsblock: call and parse getdevicelist Jim Rees
2011-06-14 15:36   ` Benny Halevy
2011-06-12 23:44 ` [PATCH 18/34] pnfsblock: allow use of PG_owner_priv_1 flag Jim Rees
2011-06-13 15:56   ` Fred Isaman
2011-06-12 23:44 ` [PATCH 19/34] pnfsblock: xdr decode pnfs_block_layout4 Jim Rees
2011-06-12 23:44 ` [PATCH 20/34] pnfsblock: find_get_extent Jim Rees
2011-06-12 23:44 ` [PATCH 21/34] pnfsblock: SPLITME: add extent manipulation functions Jim Rees
2011-06-14 15:40   ` Benny Halevy
2011-06-12 23:44 ` [PATCH 22/34] pnfsblock: merge rw extents Jim Rees
2011-06-12 23:44 ` [PATCH 23/34] pnfsblock: encode_layoutcommit Jim Rees
2011-06-14 15:44   ` Benny Halevy
2011-06-12 23:44 ` [PATCH 24/34] pnfsblock: cleanup_layoutcommit Jim Rees
2011-06-12 23:44 ` [PATCH 25/34] pnfsblock: bl_read_pagelist Jim Rees
2011-06-12 23:44 ` [PATCH 26/34] pnfsblock: write_begin Jim Rees
2011-06-12 23:44 ` [PATCH 27/34] pnfsblock: write_end Jim Rees
2011-06-12 23:44 ` [PATCH 28/34] pnfsblock: write_end_cleanup Jim Rees
2011-06-12 23:45 ` [PATCH 29/34] pnfsblock: bl_write_pagelist support functions Jim Rees
2011-06-12 23:45 ` [PATCH 30/34] pnfsblock: bl_write_pagelist Jim Rees
2011-06-12 23:45 ` [PATCH 31/34] pnfsblock: note written INVAL areas for layoutcommit Jim Rees
2011-06-12 23:45 ` [PATCH 32/34] pnfsblock: Implement release_inval_marks Jim Rees
2011-06-12 23:45 ` Jim Rees [this message]
2011-06-12 23:45 ` [PATCH 34/34] NFS41: do not update isize if inode needs layoutcommit Jim Rees
2011-06-14 16:15   ` Benny Halevy
2011-06-14 16:22     ` Fred Isaman

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