From: James Cloos <cloos@jhcloos.com>
To: linux-btrfs@vger.kernel.org
Subject: 2.6.33 high cpu usage
Date: Tue, 02 Mar 2010 13:35:21 -0500 [thread overview]
Message-ID: <m3hboy3726.fsf@lugabout.jhcloos.org> (raw)
[-- Attachment #1: Type: text/plain, Size: 710 bytes --]
With the ATI bug I was hitting earlier fixed, only my btrfs partition
continues to show high cpu usage for some operations.
Rsync, git pull, git checkout and svn up are typicall operations which
trigger the high cpu usage.
As an example, this perf report is from using git checkout to change to
a new branch; the change needed to checkout 208 files out of about 1600
total files. du(1) reports that the checkout is about 14 megs; the
alternates for that tree have about 60 megs of git packs.
As you can see btrfs_find_space_cluster(), find_next_bit() and
find_next_zero_bit() use most of the sys cpu. That patterns seems to
hold whenever I run perf top during such operations.
Box is x86_32, pentium3m.
[-- Attachment #2: perf report of git checkout --track ... --]
[-- Type: text/plain, Size: 15772 bytes --]
# Samples: 11372
#
# Overhead Command Shared Object Symbol
# ........ ....... .................. ......
#
42.75% git [kernel] [k] btrfs_find_space_cluster
34.59% git [kernel] [k] find_next_bit
14.01% git [kernel] [k] find_next_zero_bit
0.76% git libz.so.1.2.3 [.] inflate_fast
0.42% git [kernel] [k] find_extent_buffer
0.34% git [kernel] [k] find_free_extent
0.28% git git [.] blk_SHA1_Block
0.26% git libz.so.1.2.3 [.] adler32
0.26% git [kernel] [k] test_range_bit
0.23% git [kernel] [k] scsi_dispatch_cmd
0.22% git [kernel] [k] div64_u64
0.21% git [kernel] [k] generic_bin_search
0.20% git [kernel] [k] __do_softirq
0.16% git [kernel] [k] get_page_from_freelist
0.16% git [ehci_hcd] [k] 0x00000000003c25
0.15% git [kernel] [k] read_extent_buffer
0.14% git [kernel] [k] btrfs_return_cluster_to_free_space
0.12% git [kernel] [k] btrfs_search_slot
0.12% git [kernel] [k] map_private_extent_buffer
0.11% git [kernel] [k] btrfs_clear_path_blocking
0.11% git [kernel] [k] set_extent_bit
0.11% git [kernel] [k] tree_search_offset
0.11% git [kernel] [k] __copy_from_user_ll
0.11% git git [.] patch_delta
0.08% git [kernel] [k] kmem_cache_alloc
0.08% git [kernel] [k] btrfs_alloc_from_cluster
0.08% git [kernel] [k] memmove
0.07% git [kernel] [k] __queue_work
0.07% git [kernel] [k] __extent_read_full_page
0.07% git [kernel] [k] alloc_extent_buffer
0.07% git [kernel] [k] scsi_request_fn
0.06% git libz.so.1.2.3 [.] inflate_table
0.06% git [kernel] [k] btrfs_unlock_up_safe
0.06% git [kernel] [k] memcpy_extent_buffer
0.06% git [kernel] [k] tree_insert
0.06% git [kernel] [k] __make_request
0.05% git [kernel] [k] block_group_cache_tree_search
0.05% git [kernel] [k] verify_parent_transid
0.05% git [kernel] [k] map_extent_buffer
0.04% git [kernel] [k] btrfs_header_nritems
0.04% git [kernel] [k] btrfs_tree_unlock
0.04% git [kernel] [k] do_page_fault
0.04% git libz.so.1.2.3 [.] .L207
0.04% git libz.so.1.2.3 [.] .L213
0.04% git git [.] cache_name_compare
0.04% git [kernel] [k] __rcu_process_callbacks
0.04% git [kernel] [k] __set_page_dirty_nobuffers
0.04% git [kernel] [k] kmem_cache_alloc_notrace
0.04% git [kernel] [k] bin_search
0.04% git [kernel] [k] unlock_up
0.04% git [kernel] [k] btrfs_reserve_extent
0.04% git [kernel] [k] btrfs_item_offset
0.04% git [kernel] [k] unmap_extent_buffer
0.04% git [kernel] [k] radix_tree_lookup_slot
0.04% git [kernel] [k] __lookup
0.04% git [kernel] [k] rb_erase
0.04% git [kernel] [k] tcp_transmit_skb
0.03% git libc-2.11.so [.] _int_malloc
0.03% git git [.] make_traverse_path
0.03% git [kernel] [k] __wake_up_bit
0.03% git [kernel] [k] handle_IRQ_event
0.03% git [kernel] [k] filemap_fault
0.03% git [kernel] [k] __remove_mapping
0.03% git [kernel] [k] __d_lookup
0.03% git [kernel] [k] btrfs_release_path
0.03% git [kernel] [k] btrfs_lock_root_node
0.03% git [kernel] [k] btrfs_put_block_group
0.03% git [kernel] [k] __btrfs_free_extent
0.03% git [kernel] [k] btrfs_mark_buffer_dirty
0.03% git [kernel] [k] inode_tree_add
0.03% git [kernel] [k] __tree_search
0.03% git [kernel] [k] btrfs_key_blockptr
0.03% git [kernel] [k] try_release_extent_buffer
0.03% git [kernel] [k] btrfs_tree_lock
0.03% git [kernel] [k] spin_unlock
0.03% git [kernel] [k] find_ref_head
0.03% git [kernel] [k] rb_next
0.02% git libc-2.11.so [.] _IO_vfprintf_internal
0.02% git libc-2.11.so [.] _IO_default_xsputn_internal
0.02% git git [.] git_checkattr
0.02% git git [.] df_name_compare
0.02% git git [.] write_index
0.02% git git [.] unpack_callback
0.02% git git [.] twoway_merge
0.02% git [vdso] [.] 0x000000ffffe425
0.02% git [kernel] [k] check_for_new_grace_period
0.02% git [kernel] [k] __rcu_read_unlock
0.02% git [kernel] [k] unlock_page
0.02% git [kernel] [k] add_to_page_cache_locked
0.02% git [kernel] [k] release_pages
0.02% git [kernel] [k] unmap_vmas
0.02% git [kernel] [k] find_vma
0.02% git [kernel] [k] kfree
0.02% git [kernel] [k] fd_install
0.02% git [kernel] [k] pipe_read
0.02% git [kernel] [k] do_lookup
0.02% git [kernel] [k] link_path_walk
0.02% git [kernel] [k] dput
0.02% git [kernel] [k] inode_init_always
0.02% git [kernel] [k] find_inode
0.02% git [kernel] [k] __btrfs_cow_block
0.02% git [kernel] [k] btrfs_reduce_alloc_profile
0.02% git [kernel] [k] lookup_inline_extent_backref
0.02% git [kernel] [k] btree_read_extent_buffer_pages
0.02% git [kernel] [k] btrfs_inode_sequence
0.02% git [kernel] [k] free_extent_buffer
0.02% git [kernel] [k] merge_state
0.02% git [kernel] [k] insert_state
0.02% git [kernel] [k] clear_extent_bit
0.02% git [kernel] [k] write_extent_buffer
0.02% git [kernel] [k] btrfs_clear_lock_blocking
0.02% git [kernel] [k] security_inode_alloc
0.02% git [kernel] [k] chksum_update
0.02% git [kernel] [k] generic_make_request
0.02% git [kernel] [k] get_request
0.02% git [kernel] [k] yenta_interrupt
0.02% git [kernel] [k] acpi_pm_read
0.01% git libz.so.1.2.3 [.] .L212
0.01% git libz.so.1.2.3 [.] .L211
0.01% git libc-2.11.so [.] __GI_getenv
0.01% git libc-2.11.so [.] _itoa_word
0.01% git libc-2.11.so [.] __GI_fflush
0.01% git libc-2.11.so [.] __fopen_internal
0.01% git libc-2.11.so [.] __calloc
0.01% git libc-2.11.so [.] __GI_strlen
0.01% git ld-2.11.so [.] _dl_relocate_object
0.01% git git [.] convert_to_working_tree
0.01% git git [.] checkout_entry
0.01% git git [.] add_name_hash
0.01% git git [.] display
0.01% git git [.] verify_path
0.01% git git [.] ce_write
0.01% git git [.] read_index_from
0.01% git git [.] add_entry
0.01% git git [.] git_inflate
0.01% git [kernel] [k] ptregs_execve
0.01% git [kernel] [k] run_timer_softirq
0.01% git [kernel] [k] mod_timer
0.01% git [kernel] [k] wake_up_bit
0.01% git [kernel] [k] prepare_to_wait
0.01% git [kernel] [k] __rcu_read_lock
0.01% git [kernel] [k] rcu_start_gp
0.01% git [kernel] [k] rcu_process_callbacks
0.01% git [kernel] [k] mempool_alloc
0.01% git [kernel] [k] __alloc_pages_nodemask
0.01% git [kernel] [k] free_hot_cold_page
0.01% git [kernel] [k] activate_page
0.01% git [kernel] [k] mark_page_accessed
0.01% git [kernel] [k] ____pagevec_lru_add
0.01% git [kernel] [k] __lru_cache_add
0.01% git [kernel] [k] lru_add_drain
0.01% git [kernel] [k] put_page
0.01% git [kernel] [k] invalidate_mapping_pages
0.01% git [kernel] [k] page_add_new_anon_rmap
0.01% git [kernel] [k] generic_fillattr
0.01% git [kernel] [k] cp_new_stat64
0.01% git [kernel] [k] path_init
0.01% git [kernel] [k] path_put
0.01% git [kernel] [k] path_to_nameidata
0.01% git [kernel] [k] path_walk
0.01% git [kernel] [k] do_unlinkat
0.01% git [kernel] [k] _d_rehash
0.01% git [kernel] [k] d_alloc
0.01% git [kernel] [k] hash
0.01% git [kernel] [k] iput
0.01% git [kernel] [k] inode_init_once
0.01% git [kernel] [k] clear_inode
0.01% git [kernel] [k] ifind
0.01% git [kernel] [k] bio_alloc_bioset
0.01% git [kernel] [k] locks_remove_posix
0.01% git [kernel] [k] dtSearch
0.01% git [kernel] [k] metapage_get_blocks
0.01% git [kernel] [k] check_block
0.01% git [kernel] [k] btrfs_set_path_blocking
0.01% git [kernel] [k] btrfs_alloc_path
0.01% git [kernel] [k] read_block_for_search
0.01% git [kernel] [k] update_ref_for_cow
0.01% git [kernel] [k] read_node_slot
0.01% git [kernel] [k] btrfs_leaf_free_space
0.01% git [kernel] [k] btrfs_insert_empty_items
0.01% git [kernel] [k] pin_down_bytes
0.01% git [kernel] [k] update_block_group
0.01% git [kernel] [k] run_one_delayed_ref
0.01% git [kernel] [k] btrfs_free_extent
0.01% git [kernel] [k] btrfs_find_block_group
0.01% git [kernel] [k] btrfs_lookup_dir_index_item
0.01% git [kernel] [k] btrfs_lookup_inode
0.01% git [kernel] [k] btrfs_find_tree_block
0.01% git [kernel] [k] btrfs_set_buffer_uptodate
0.01% git [kernel] [k] btrfs_find_create_tree_block
0.01% git [kernel] [k] btrfs_buffer_uptodate
0.01% git [kernel] [k] clean_tree_block
0.01% git [kernel] [k] wait_current_trans
0.01% git [kernel] [k] __btrfs_end_transaction
0.01% git [kernel] [k] start_transaction
0.01% git [kernel] [k] btrfs_set_page_dirty
0.01% git [kernel] [k] init_btrfs_i
0.01% git [kernel] [k] btrfs_merge_bio_hook
0.01% git [kernel] [k] btrfs_get_extent
0.01% git [kernel] [k] btrfs_add_link
0.01% git [kernel] [k] btrfs_delete_inode
0.01% git [kernel] [k] btrfs_clear_bit_hook
0.01% git [kernel] [k] lookup_extent_mapping
0.01% git [kernel] [k] btrfs_file_extent_num_bytes
0.01% git [kernel] [k] btrfs_dir_name_len
0.01% git [kernel] [k] btrfs_dir_data_len
0.01% git [kernel] [k] btrfs_key_generation
0.01% git [kernel] [k] btrfs_timespec_nsec
0.01% git [kernel] [k] btrfs_timespec_sec
0.01% git [kernel] [k] btrfs_inode_mode
0.01% git [kernel] [k] btrfs_inode_nbytes
0.01% git [kernel] [k] btrfs_set_item_size
0.01% git [kernel] [k] btrfs_set_item_offset
0.01% git [kernel] [k] btrfs_set_extent_flags
0.01% git [kernel] [k] btrfs_set_timespec_sec
0.01% git [kernel] [k] btrfs_set_inode_block_group
0.01% git [kernel] [k] extent_io_tree_init
0.01% git [kernel] [k] set_page_extent_mapped
0.01% git [kernel] [k] free_extent_state
0.01% git [kernel] [k] split_state
0.01% git [kernel] [k] spin_unlock
0.01% git [kernel] [k] memset_extent_buffer
0.01% git [kernel] [k] memcmp_extent_buffer
0.01% git [kernel] [k] extent_buffer_uptodate
0.01% git [kernel] [k] set_extent_buffer_uptodate
0.01% git [kernel] [k] __btrfs_map_block
0.01% git [kernel] [k] btrfs_map_bio
0.01% git [kernel] [k] bitmap_clear_bits
0.01% git [kernel] [k] btrfs_find_space_for_alloc
0.01% git [kernel] [k] btrfs_find_ref_cluster
0.01% git [kernel] [k] add_delayed_tree_ref
0.01% git [kernel] [k] cap_d_instantiate
0.01% git [kernel] [k] blk_rq_init
0.01% git [kernel] [k] radix_tree_lookup
0.01% git [kernel] [k] rb_insert_color
0.01% git [kernel] [k] rb_prev
0.01% git [kernel] [k] sha_transform
0.01% git [kernel] [k] strncpy_from_user
0.01% git [kernel] [k] copy_to_user
0.01% git [kernel] [k] tty_write
0.01% git [kernel] [k] __scsi_release_buffers
0.01% git [kernel] [k] scsi_io_completion
0.01% git [kernel] [k] ata_sff_interrupt
0.01% git [kernel] [k] mdio_ctrl_hw
0.01% git [kernel] [k] sock_alloc_send_pskb
0.01% git [kernel] [k] tcp_event_data_recv
0.01% git [kernel] [k] __tcp_select_window
0.01% git [kernel] [k] tcp_v4_send_check
0.01% git [kernel] [k] tcp_v4_rcv
0.01% git [kernel] [k] _cond_resched
0.01% git [kernel] [k] mutex_trylock
#
# (For a higher level overview, try: perf report --sort comm,dso)
#
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-JimC
--
James Cloos <cloos@jhcloos.com> OpenPGP: 1024D/ED7DAEA6
next reply other threads:[~2010-03-02 18:35 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-03-02 18:35 James Cloos [this message]
2010-03-02 19:53 ` 2.6.33 high cpu usage Josef Bacik
2010-03-02 20:12 ` James Cloos
2010-03-04 21:46 ` James Cloos
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