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authorAndreas Gerstmayr <andreas.gerstmayr@catalysts.cc>2017-01-10 14:17:56 +0100
committerIlya Dryomov <idryomov@gmail.com>2017-02-20 12:16:05 +0100
commit7c94ba27903c3c46c5829e96efb7c2a8ab7510e9 (patch)
treeffbc7ec7dfc898703ef368c71288a20b9e14a7aa /fs/ceph
parent0fbc5360bf433ffeccbb94ef806d637049899741 (diff)
downloadop-kernel-dev-7c94ba27903c3c46c5829e96efb7c2a8ab7510e9.zip
op-kernel-dev-7c94ba27903c3c46c5829e96efb7c2a8ab7510e9.tar.gz
ceph: set io_pages bdi hint
This patch sets the io_pages bdi hint based on the rsize mount option. Without this patch large buffered reads (request size > max readahead) are processed sequentially in chunks of the readahead size (i.e. read requests are sent out up to the readahead size, then the do_generic_file_read() function waits until the first page is received). With this patch read requests are sent out at once up to the size specified in the rsize mount option (default: 64 MB). Signed-off-by: Andreas Gerstmayr <andreas.gerstmayr@catalysts.cc> Acked-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Yan, Zheng <zyan@redhat.com>
Diffstat (limited to 'fs/ceph')
-rw-r--r--fs/ceph/super.c8
-rw-r--r--fs/ceph/super.h4
2 files changed, 10 insertions, 2 deletions
diff --git a/fs/ceph/super.c b/fs/ceph/super.c
index 6bd20d7..a0a0b6d 100644
--- a/fs/ceph/super.c
+++ b/fs/ceph/super.c
@@ -952,6 +952,14 @@ static int ceph_register_bdi(struct super_block *sb,
fsc->backing_dev_info.ra_pages =
VM_MAX_READAHEAD * 1024 / PAGE_SIZE;
+ if (fsc->mount_options->rsize > fsc->mount_options->rasize &&
+ fsc->mount_options->rsize >= PAGE_SIZE)
+ fsc->backing_dev_info.io_pages =
+ (fsc->mount_options->rsize + PAGE_SIZE - 1)
+ >> PAGE_SHIFT;
+ else if (fsc->mount_options->rsize == 0)
+ fsc->backing_dev_info.io_pages = ULONG_MAX;
+
err = bdi_register(&fsc->backing_dev_info, NULL, "ceph-%ld",
atomic_long_inc_return(&bdi_seq));
if (!err)
diff --git a/fs/ceph/super.h b/fs/ceph/super.h
index a80a915..f3f9215 100644
--- a/fs/ceph/super.h
+++ b/fs/ceph/super.h
@@ -45,8 +45,8 @@
#define ceph_test_mount_opt(fsc, opt) \
(!!((fsc)->mount_options->flags & CEPH_MOUNT_OPT_##opt))
-#define CEPH_RSIZE_DEFAULT 0 /* max read size */
-#define CEPH_RASIZE_DEFAULT (8192*1024) /* readahead */
+#define CEPH_RSIZE_DEFAULT (64*1024*1024) /* max read size */
+#define CEPH_RASIZE_DEFAULT (8192*1024) /* max readahead */
#define CEPH_MAX_READDIR_DEFAULT 1024
#define CEPH_MAX_READDIR_BYTES_DEFAULT (512*1024)
#define CEPH_SNAPDIRNAME_DEFAULT ".snap"
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