search for: reada

Reduce ioprio class of scrub readahead threads to idle priority. This setting is fixed. This priority has shown the best performance during all measurements. Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de> --- fs/btrfs/ctree.h | 3 +++ fs/btrfs/reada.c | 5 +++++ 2 files changed, 8 insertions(+) diff --git a...

Hi, I agree that the earlier example was already racy due to shared flag variable. Sorry for the wrong example. Please ignore it. I have modified the program as follows. The only shared variable is 'a' and the following is a non-racy program. int a; int readA(bool flag) { int r=0; if(flag) { r = a; } return r; } void writeA(){ a = 42; } int main() { bool flag = false; thread first (writeA); thread second (readA, flag); first.join(); second.join(); return 0; } The generated LLVM IR ; Function Attrs: nounwind readonly uwtable define...

Hi, I am looking for thoughts on the following LLVM transformation. Consider the following transformation which replaces conditional load(a) with load(a);select instructions. Source -------- int a; bool flag; int readA() { int r=0; if(flag) { r = a; } return r; } Command -------- clang++ -std=c++11 -pthread -emit-llvm <filename>.cpp -S;opt -O3 <filename>.ll -o <filename>.opt.bc -S Target ------- define i32 @_Z5readAv() #3 { entry: %0 = load i8* @flag, align 1 %1 = and i8 %0, 1 %to...

...ns_handle *trans = NULL; int slot; struct btrfs_root_item ri; + struct list_head dropping_trees; dev_cache = RB_ROOT; cache_tree_init(&chunk_cache); @@ -5461,6 +5493,7 @@ static int check_chunks_and_extents(struct btrfs_root *root) cache_tree_init(&nodes); cache_tree_init(&reada); cache_tree_init(&corrupt_blocks); + INIT_LIST_HEAD(&dropping_trees); if (repair) { trans = btrfs_start_transaction(root, 1); @@ -5513,26 +5546,74 @@ again: offset = btrfs_item_ptr_offset(leaf, path.slots[0]); read_extent_buffer(leaf, &ri, offset, sizeof(ri)); - bu...

Hi, Lustre manual 1.6 v18 says that that in production lustre debug level should be set to fairly low. Manual also says that I can verify that level by running following commands: # sysctl portals.debug This gives ne following error error: ''portals.debug'' is an unknown key cat /proc/sys/lnet/debug gives output: ioctl neterror warning error emerg ha config console cat

This series introduces a generic readahead interface for btrfs trees. The intention is to use it to speed up scrub in a first run, but balance is another hot candidate. In general, every tree walk could be accompanied by a readahead. Deletion of large files comes to mind, where the fetching of the csums takes most of the time. Also the...

This series introduces a generic readahead interface for btrfs trees. The intention is to use it to speed up scrub in a first run, but balance is another hot candidate. In general, every tree walk could be accompanied by a readahead. Deletion of large files comes to mind, where the fetching of the csums takes most of the time. Also the...

If we have particularly full nodes, we could call btrfs_node_blockptr up to 32 times, which is 32 pairs of kmap/kunmap, which _sucks_. So go ahead and map the extent buffer while we look for readahead targets. Thanks, Signed-off-by: Josef Bacik <josef@redhat.com> --- fs/btrfs/ctree.c | 23 +++++++++++++++++++++-- 1 files changed, 21 insertions(+), 2 deletions(-) diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c index 84d7ca1..009bcf7 100644 --- a/fs/btrfs/ctree.c +++ b/fs/btrfs/ct...

...) > =A0[PATCH 05/31] connection: make process_request_queue use util_find_eos= _delim > =A0[PATCH 06/31] connection.c: use util_find_eos_delim to simplify _handl= e_shoutcast_compatible > > [cleanup shoutcast code] > =A0[PATCH 07/31] Connection: make _handle_shoutcast_compatible more reada= ble, > > [cleanup generic connection code] > =A0[PATCH 08/31] connection: _handle_connection re-roll logic in a more r= eadeable way. > =A0[PATCH 09/31] connection: simplify _handle_connection (make it more re= adeable) > =A0[PATCH 10/31] Connection: _accept_connection, simplify log...

...o CC fs/btrfs/tree-log.o CC fs/btrfs/free-space-cache.o CC fs/btrfs/zlib.o CC fs/btrfs/lzo.o CC fs/btrfs/compression.o CC fs/btrfs/delayed-ref.o CC fs/btrfs/relocation.o CC fs/btrfs/delayed-inode.o CC fs/btrfs/scrub.o CC fs/btrfs/reada.o CC fs/btrfs/backref.o CC fs/btrfs/ulist.o CC fs/btrfs/acl.o LD fs/btrfs/btrfs.o LD fs/btrfs/built-in.o ... --Swapnil -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@vger.kernel.org More m...

R 2.15.1 OS X Colleagues, I am reading a 1 GB file into R using read.table. The file consists of 100 tables, each of which is headed by two lines of characters. The first of these lines is: TABLE NO. 1 The second is a list of column headers. For example: TABLE NO. 1 COL1 COL2 COL3 COL4 COL5 COL6 COL7 COL8 COL9 COL10

Let''s say, for example, that I want to create an order form and that I want to assign an order number to each submitted order form for tracking purposes. So, I create a little file to store the latest number. Then when a new order comes in, I grab that number, increment it by one, assign the incremented number to the order, and finally replace the number that''s in the file with

...struct inode *inode, struct buffer_head *bh); -int ocfs2_aio_read(struct file *file, struct kiocb *req, struct iocb *iocb); -int ocfs2_aio_write(struct file *file, struct kiocb *req, struct iocb *iocb); struct buffer_head *ocfs2_bread(struct inode *inode, int block, int *err, int reada); diff --git a/fs/ocfs2/ocfs2_trace.h b/fs/ocfs2/ocfs2_trace.h index 3b481f4..1c5018c 100644 --- a/fs/ocfs2/ocfs2_trace.h +++ b/fs/ocfs2/ocfs2_trace.h @@ -1310,13 +1310,13 @@ DEFINE_OCFS2_FILE_OPS(ocfs2_file_release); DEFINE_OCFS2_FILE_OPS(ocfs2_sync_file); -DEFINE_OCFS2_FILE_OPS(ocfs2_file_...

...2088,16 +2088,17 @@ void btrfs_orphan_cleanup(struct btrfs_root *root) struct inode *inode; int ret = 0, nr_unlink = 0, nr_truncate = 0; - path = btrfs_alloc_path(); - if (!path) + if (!xchg(&root->clean_orphans, 0)) return; + + path = btrfs_alloc_path(); + BUG_ON(!path); path->reada = -1; key.objectid = BTRFS_ORPHAN_OBJECTID; btrfs_set_key_type(&key, BTRFS_ORPHAN_ITEM_KEY); key.offset = (u64)-1; - while (1) { ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); if (ret < 0) { @@ -3293,6 +3294,11 @@ void btrfs_delete_inode(struct inode *inode) }...

https://bugzilla.samba.org/show_bug.cgi?id=10322 Summary: Slow Performance over Network rsync Product: rsync Version: 3.1.0 Platform: All OS/Version: All Status: NEW Severity: normal Priority: P5 Component: core AssignedTo: wayned at samba.org ReportedBy: Joerg.Grube at Gmx.De

Hi, so here it is, LZ4 compression method inside btrfs. The patchset is based on top of current Chris'' for-linus + Andi''s snappy implementation + the fixes from Li Zefan. Passes xfstests and stresstests. I haven''t measured performance on wide range of hardware or workloads, rather wanted to publish the patches before I get distracted again. I''d like to ask

...ts array records the index of the item or block pointer * used while walking the tree. */ + struct btrfs_path { struct extent_buffer *nodes[BTRFS_MAX_LEVEL]; int slots[BTRFS_MAX_LEVEL]; + /* if there is real range locking, this locks field will change */ + int locks[BTRFS_MAX_LEVEL]; int reada; + /* keep some upper locks as we walk down */ int lowest_level; /* * set by btrfs_split_item, tells search_slot to keep all locks * and to force calls to keep space in the nodes */ - int search_for_split; + unsigned int search_for_split:1; + unsigned int keep_locks:1; + unsigned int...

This patch logs(ERROR) -EIO errors just when they are hitted. Signed-off-by: Wengang Wang <wen.gang.wang at oracle.com> -- diff -up ./linux-2.6.29.y.build/fs/ocfs2/buffer_head_io.c.orig ./linux-2.6.29.y.build/fs/ocfs2/buffer_head_io.c --- ./linux-2.6.29.y.build/fs/ocfs2/buffer_head_io.c.orig 2009-04-17 13:55:52.000000000 +0800 +++ ./linux-2.6.29.y.build/fs/ocfs2/buffer_head_io.c 2009-04-17

...u64 num_refs; u64 extent_flags; - WARN_ON(num_bytes < root->sectorsize); + if (metadata && + !btrfs_fs_incompat(root->fs_info, + BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA)) { + offset = root->leafsize; + metadata = 0; + } + path = btrfs_alloc_path(); path->reada = 1; + key.objectid = bytenr; - key.offset = num_bytes; - btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY); + key.offset = offset; + if (metadata) + key.type = BTRFS_METADATA_ITEM_KEY; + else + key.type = BTRFS_EXTENT_ITEM_KEY; + +again: ret = btrfs_search_slot(trans, root->fs_info->...

Here are 3 patches to avoid undesired aborts of mkfs.btrfs. These are based on top of Chris''s btrfs-progs.git: git://git.kernel.org/pub/scm/linux/kernel/git/mason/btrfs-progs.git Thanks, H.Seto Hidetoshi Seto (3): btrfs-progs: error if device for mkfs is too small btrfs-progs: error if device have no space to make primary chunks btrfs-progs: calculate available